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[PATCH] kexec code cleanup

Browse source 
o Following patch provides purely cosmetic changes and corrects CodingStyle
  guide lines related certain issues like below in kexec related files

  o braces for one line "if" statements, "for" loops,
  o more than 80 column wide lines,
  o No space after "while", "for" and "switch" key words

o Changes:
  o take-2: Removed the extra tab before "case" key words.
  o take-3: Put operator at the end of line and space before "*/"

Signed-off-by: Maneesh Soni <maneesh@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Maneesh Soni 2005-06-25 14:58:28 -07:00 committed by Linus Torvalds
parent 4f339ecb30
commit 72414d3f1d
10 changed files with 243 additions and 211 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

23
arch/i386/kernel/crash.c
View file

@ -31,10 +31,11 @@ note_buf_t crash_notes[NR_CPUS];
/* This keeps a track of which one is crashing cpu. */
static int crashing_cpu;
static u32 *append_elf_note(u32 *buf,
char *name, unsigned type, void *data, size_t data_len)
static u32 *append_elf_note(u32 *buf, char *name, unsigned type, void *data,
size_t data_len)
{
struct elf_note note;
note.n_namesz = strlen(name) + 1;
note.n_descsz = data_len;
note.n_type = type;
@ -44,26 +45,28 @@ static u32 *append_elf_note(u32 *buf,
buf += (note.n_namesz + 3)/4;
memcpy(buf, data, note.n_descsz);
buf += (note.n_descsz + 3)/4;
return buf;
}
static void final_note(u32 *buf)
{
struct elf_note note;
note.n_namesz = 0;
note.n_descsz = 0;
note.n_type = 0;
memcpy(buf, &note, sizeof(note));
}
static void crash_save_this_cpu(struct pt_regs *regs, int cpu)
{
struct elf_prstatus prstatus;
u32 *buf;
if ((cpu < 0) || (cpu >= NR_CPUS)) {
if ((cpu < 0) || (cpu >= NR_CPUS))
return;
}
/* Using ELF notes here is opportunistic.
* I need a well defined structure format
* for the data I pass, and I need tags
@ -75,9 +78,8 @@ static void crash_save_this_cpu(struct pt_regs *regs, int cpu)
memset(&prstatus, 0, sizeof(prstatus));
prstatus.pr_pid = current->pid;
elf_core_copy_regs(&prstatus.pr_reg, regs);
buf = append_elf_note(buf, "CORE", NT_PRSTATUS,
&prstatus, sizeof(prstatus));
buf = append_elf_note(buf, "CORE", NT_PRSTATUS, &prstatus,
sizeof(prstatus));
final_note(buf);
}
@ -119,8 +121,8 @@ static void crash_save_self(struct pt_regs *saved_regs)
{
struct pt_regs regs;
int cpu;
cpu = smp_processor_id();
cpu = smp_processor_id();
if (saved_regs)
crash_setup_regs(&regs, saved_regs);
else
@ -153,6 +155,7 @@ static int crash_nmi_callback(struct pt_regs *regs, int cpu)
/* Assume hlt works */
__asm__("hlt");
for(;;);
return 1;
}
@ -169,8 +172,8 @@ static void smp_send_nmi_allbutself(void)
static void nmi_shootdown_cpus(void)
{
unsigned long msecs;
atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1);
atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1);
/* Would it be better to replace the trap vector here? */
set_nmi_callback(crash_nmi_callback);
/* Ensure the new callback function is set before sending

16
arch/i386/kernel/machine_kexec.c
View file

@ -80,7 +80,8 @@ static void identity_map_page(unsigned long address)
/* Identity map the page table entry */
pgtable_level1[level1_index] = address | L0_ATTR;
pgtable_level2[level2_index] = __pa(pgtable_level1) | L1_ATTR;
set_64bit(&pgtable_level3[level3_index], __pa(pgtable_level2) | L2_ATTR);
set_64bit(&pgtable_level3[level3_index],
__pa(pgtable_level2) | L2_ATTR);
/* Flush the tlb so the new mapping takes effect.
* Global tlb entries are not flushed but that is not an issue.
@ -139,8 +140,10 @@ static void load_segments(void)
}
typedef asmlinkage NORET_TYPE void (*relocate_new_kernel_t)(
unsigned long indirection_page, unsigned long reboot_code_buffer,
unsigned long start_address, unsigned int has_pae) ATTRIB_NORET;
unsigned long indirection_page,
unsigned long reboot_code_buffer,
unsigned long start_address,
unsigned int has_pae) ATTRIB_NORET;
const extern unsigned char relocate_new_kernel[];
extern void relocate_new_kernel_end(void);
@ -180,20 +183,23 @@ NORET_TYPE void machine_kexec(struct kimage *image)
{
unsigned long page_list;
unsigned long reboot_code_buffer;
relocate_new_kernel_t rnk;
/* Interrupts aren't acceptable while we reboot */
local_irq_disable();
/* Compute some offsets */
reboot_code_buffer = page_to_pfn(image->control_code_page) << PAGE_SHIFT;
reboot_code_buffer = page_to_pfn(image->control_code_page)
<< PAGE_SHIFT;
page_list = image->head;
/* Set up an identity mapping for the reboot_code_buffer */
identity_map_page(reboot_code_buffer);
/* copy it out */
memcpy((void *)reboot_code_buffer, relocate_new_kernel, relocate_new_kernel_size);
memcpy((void *)reboot_code_buffer, relocate_new_kernel,
relocate_new_kernel_size);
/* The segment registers are funny things, they are
* automatically loaded from a table, in memory wherever you

30
arch/ppc/kernel/machine_kexec.c
View file

@ -21,24 +21,23 @@
#include <asm/machdep.h>
typedef NORET_TYPE void (*relocate_new_kernel_t)(
unsigned long indirection_page, unsigned long reboot_code_buffer,
unsigned long start_address) ATTRIB_NORET;
unsigned long indirection_page,
unsigned long reboot_code_buffer,
unsigned long start_address) ATTRIB_NORET;
const extern unsigned char relocate_new_kernel[];
const extern unsigned int relocate_new_kernel_size;
void machine_shutdown(void)
{
if (ppc_md.machine_shutdown) {
if (ppc_md.machine_shutdown)
ppc_md.machine_shutdown();
}
}
void machine_crash_shutdown(struct pt_regs *regs)
{
if (ppc_md.machine_crash_shutdown) {
if (ppc_md.machine_crash_shutdown)
ppc_md.machine_crash_shutdown();
}
}
/*
@ -48,9 +47,8 @@ void machine_crash_shutdown(struct pt_regs *regs)
*/
int machine_kexec_prepare(struct kimage *image)
{
if (ppc_md.machine_kexec_prepare) {
if (ppc_md.machine_kexec_prepare)
return ppc_md.machine_kexec_prepare(image);
}
/*
* Fail if platform doesn't provide its own machine_kexec_prepare
* implementation.
@ -60,9 +58,8 @@ int machine_kexec_prepare(struct kimage *image)
void machine_kexec_cleanup(struct kimage *image)
{
if (ppc_md.machine_kexec_cleanup) {
if (ppc_md.machine_kexec_cleanup)
ppc_md.machine_kexec_cleanup(image);
}
}
/*
@ -71,9 +68,9 @@ void machine_kexec_cleanup(struct kimage *image)
*/
NORET_TYPE void machine_kexec(struct kimage *image)
{
if (ppc_md.machine_kexec) {
if (ppc_md.machine_kexec)
ppc_md.machine_kexec(image);
} else {
else {
/*
* Fall back to normal restart if platform doesn't provide
* its own kexec function, and user insist to kexec...
@ -83,7 +80,6 @@ NORET_TYPE void machine_kexec(struct kimage *image)
for(;;);
}
/*
* This is a generic machine_kexec function suitable at least for
* non-OpenFirmware embedded platforms.
@ -104,15 +100,15 @@ void machine_kexec_simple(struct kimage *image)
/* we need both effective and real address here */
reboot_code_buffer =
(unsigned long)page_address(image->control_code_page);
(unsigned long)page_address(image->control_code_page);
reboot_code_buffer_phys = virt_to_phys((void *)reboot_code_buffer);
/* copy our kernel relocation code to the control code page */
memcpy((void *)reboot_code_buffer,
relocate_new_kernel, relocate_new_kernel_size);
memcpy((void *)reboot_code_buffer, relocate_new_kernel,
relocate_new_kernel_size);
flush_icache_range(reboot_code_buffer,
reboot_code_buffer + KEXEC_CONTROL_CODE_SIZE);
reboot_code_buffer + KEXEC_CONTROL_CODE_SIZE);
printk(KERN_INFO "Bye!\n");
/* now call it */

9
arch/ppc64/kernel/machine_kexec.c
View file

@ -58,7 +58,7 @@ int machine_kexec_prepare(struct kimage *image)
* handle the virtual mode, we must make sure no destination
* overlaps kernel static data or bss.
*/
for(i = 0; i < image->nr_segments; i++)
for (i = 0; i < image->nr_segments; i++)
if (image->segment[i].mem < __pa(_end))
return -ETXTBSY;
@ -76,7 +76,7 @@ int machine_kexec_prepare(struct kimage *image)
low = __pa(htab_address);
high = low + (htab_hash_mask + 1) * HASH_GROUP_SIZE;
for(i = 0; i < image->nr_segments; i++) {
for (i = 0; i < image->nr_segments; i++) {
begin = image->segment[i].mem;
end = begin + image->segment[i].memsz;
@ -98,7 +98,7 @@ int machine_kexec_prepare(struct kimage *image)
low = *basep;
high = low + (*sizep);
for(i = 0; i < image->nr_segments; i++) {
for (i = 0; i < image->nr_segments; i++) {
begin = image->segment[i].mem;
end = begin + image->segment[i].memsz;
@ -274,7 +274,8 @@ union thread_union kexec_stack
/* Our assembly helper, in kexec_stub.S */
extern NORET_TYPE void kexec_sequence(void *newstack, unsigned long start,
void *image, void *control, void (*clear_all)(void)) ATTRIB_NORET;
void *image, void *control,
void (*clear_all)(void)) ATTRIB_NORET;
/* too late to fail here */
void machine_kexec(struct kimage *image)

4
arch/s390/kernel/machine_kexec.c
View file

@ -67,7 +67,7 @@ machine_kexec(struct kimage *image)
ctl_clear_bit(0,28);
on_each_cpu(kexec_halt_all_cpus, image, 0, 0);
for(;;);
for (;;);
}
static void
@ -85,7 +85,7 @@ kexec_halt_all_cpus(void *kernel_image)
for_each_online_cpu(cpu) {
if (cpu == smp_processor_id())
continue;
while(!smp_cpu_not_running(cpu))
while (!smp_cpu_not_running(cpu))
cpu_relax();
}

49
arch/x86_64/kernel/machine_kexec.c
View file

@ -32,29 +32,31 @@
#define L2_ATTR (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED | _PAGE_DIRTY)
#define L3_ATTR (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED | _PAGE_DIRTY)
static void init_level2_page(
u64 *level2p, unsigned long addr)
static void init_level2_page(u64 *level2p, unsigned long addr)
{
unsigned long end_addr;
addr &= PAGE_MASK;
end_addr = addr + LEVEL2_SIZE;
while(addr < end_addr) {
while (addr < end_addr) {
*(level2p++) = addr | L1_ATTR;
addr += LEVEL1_SIZE;
}
}
static int init_level3_page(struct kimage *image,
u64 *level3p, unsigned long addr, unsigned long last_addr)
static int init_level3_page(struct kimage *image, u64 *level3p,
unsigned long addr, unsigned long last_addr)
{
unsigned long end_addr;
int result;
result = 0;
addr &= PAGE_MASK;
end_addr = addr + LEVEL3_SIZE;
while((addr < last_addr) && (addr < end_addr)) {
while ((addr < last_addr) && (addr < end_addr)) {
struct page *page;
u64 *level2p;
page = kimage_alloc_control_pages(image, 0);
if (!page) {
result = -ENOMEM;
@ -66,7 +68,7 @@ static int init_level3_page(struct kimage *image,
addr += LEVEL2_SIZE;
}
/* clear the unused entries */
while(addr < end_addr) {
while (addr < end_addr) {
*(level3p++) = 0;
addr += LEVEL2_SIZE;
}
@ -75,17 +77,19 @@ out:
}
static int init_level4_page(struct kimage *image,
u64 *level4p, unsigned long addr, unsigned long last_addr)
static int init_level4_page(struct kimage *image, u64 *level4p,
unsigned long addr, unsigned long last_addr)
{
unsigned long end_addr;
int result;
result = 0;
addr &= PAGE_MASK;
end_addr = addr + LEVEL4_SIZE;
while((addr < last_addr) && (addr < end_addr)) {
while ((addr < last_addr) && (addr < end_addr)) {
struct page *page;
u64 *level3p;
page = kimage_alloc_control_pages(image, 0);
if (!page) {
result = -ENOMEM;
@ -100,11 +104,11 @@ static int init_level4_page(struct kimage *image,
addr += LEVEL3_SIZE;
}
/* clear the unused entries */
while(addr < end_addr) {
while (addr < end_addr) {
*(level4p++) = 0;
addr += LEVEL3_SIZE;
}
out:
out:
return result;
}
@ -113,7 +117,7 @@ static int init_pgtable(struct kimage *image, unsigned long start_pgtable)
{
u64 *level4p;
level4p = (u64 *)__va(start_pgtable);
return init_level4_page(image, level4p, 0, end_pfn << PAGE_SHIFT);
return init_level4_page(image, level4p, 0, end_pfn << PAGE_SHIFT);
}
static void set_idt(void *newidt, u16 limit)
@ -159,9 +163,10 @@ static void load_segments(void)
#undef __STR
}
typedef NORET_TYPE void (*relocate_new_kernel_t)(
unsigned long indirection_page, unsigned long control_code_buffer,
unsigned long start_address, unsigned long pgtable) ATTRIB_NORET;
typedef NORET_TYPE void (*relocate_new_kernel_t)(unsigned long indirection_page,
unsigned long control_code_buffer,
unsigned long start_address,
unsigned long pgtable) ATTRIB_NORET;
const extern unsigned char relocate_new_kernel[];
const extern unsigned long relocate_new_kernel_size;
@ -172,17 +177,17 @@ int machine_kexec_prepare(struct kimage *image)
int result;
/* Calculate the offsets */
start_pgtable = page_to_pfn(image->control_code_page) << PAGE_SHIFT;
start_pgtable = page_to_pfn(image->control_code_page) << PAGE_SHIFT;
control_code_buffer = start_pgtable + 4096UL;
/* Setup the identity mapped 64bit page table */
result = init_pgtable(image, start_pgtable);
if (result) {
if (result)
return result;
}
/* Place the code in the reboot code buffer */
memcpy(__va(control_code_buffer), relocate_new_kernel, relocate_new_kernel_size);
memcpy(__va(control_code_buffer), relocate_new_kernel,
relocate_new_kernel_size);
return 0;
}
@ -207,8 +212,8 @@ NORET_TYPE void machine_kexec(struct kimage *image)
local_irq_disable();
/* Calculate the offsets */
page_list = image->head;
start_pgtable = page_to_pfn(image->control_code_page) << PAGE_SHIFT;
page_list = image->head;
start_pgtable = page_to_pfn(image->control_code_page) << PAGE_SHIFT;
control_code_buffer = start_pgtable + 4096UL;
/* Set the low half of the page table to my identity mapped

2
drivers/char/mem.c
View file

@ -287,7 +287,7 @@ static ssize_t read_oldmem(struct file *file, char __user *buf,
size_t read = 0, csize;
int rc = 0;
while(count) {
while (count) {
pfn = *ppos / PAGE_SIZE;
if (pfn > saved_max_pfn)
return read;

13
include/linux/kexec.h
View file

@ -91,14 +91,17 @@ extern NORET_TYPE void machine_kexec(struct kimage *image) ATTRIB_NORET;
extern int machine_kexec_prepare(struct kimage *image);
extern void machine_kexec_cleanup(struct kimage *image);
extern asmlinkage long sys_kexec_load(unsigned long entry,
unsigned long nr_segments, struct kexec_segment __user *segments,
unsigned long flags);
unsigned long nr_segments,
struct kexec_segment __user *segments,
unsigned long flags);
#ifdef CONFIG_COMPAT
extern asmlinkage long compat_sys_kexec_load(unsigned long entry,
unsigned long nr_segments, struct compat_kexec_segment __user *segments,
unsigned long flags);
unsigned long nr_segments,
struct compat_kexec_segment __user *segments,
unsigned long flags);
#endif
extern struct page *kimage_alloc_control_pages(struct kimage *image, unsigned int order);
extern struct page *kimage_alloc_control_pages(struct kimage *image,
unsigned int order);
extern void crash_kexec(struct pt_regs *);
int kexec_should_crash(struct task_struct *);
extern struct kimage *kexec_image;

6
include/linux/syscalls.h
View file

@ -159,9 +159,9 @@ asmlinkage long sys_shutdown(int, int);
asmlinkage long sys_reboot(int magic1, int magic2, unsigned int cmd,
void __user *arg);
asmlinkage long sys_restart_syscall(void);
asmlinkage long sys_kexec_load(unsigned long entry,
unsigned long nr_segments, struct kexec_segment __user *segments,
unsigned long flags);
asmlinkage long sys_kexec_load(unsigned long entry, unsigned long nr_segments,
struct kexec_segment __user *segments,
unsigned long flags);
asmlinkage long sys_exit(int error_code);
asmlinkage void sys_exit_group(int error_code);

302
kernel/kexec.c
View file

@ -87,12 +87,15 @@ int kexec_should_crash(struct task_struct *p)
*/
#define KIMAGE_NO_DEST (-1UL)
static int kimage_is_destination_range(
struct kimage *image, unsigned long start, unsigned long end);
static struct page *kimage_alloc_page(struct kimage *image, unsigned int gfp_mask, unsigned long dest);
static int kimage_is_destination_range(struct kimage *image,
unsigned long start, unsigned long end);
static struct page *kimage_alloc_page(struct kimage *image,
unsigned int gfp_mask,
unsigned long dest);
static int do_kimage_alloc(struct kimage **rimage, unsigned long entry,
unsigned long nr_segments, struct kexec_segment __user *segments)
unsigned long nr_segments,
struct kexec_segment __user *segments)
{
size_t segment_bytes;
struct kimage *image;
@ -102,9 +105,9 @@ static int do_kimage_alloc(struct kimage **rimage, unsigned long entry,
/* Allocate a controlling structure */
result = -ENOMEM;
image = kmalloc(sizeof(*image), GFP_KERNEL);
if (!image) {
if (!image)
goto out;
}
memset(image, 0, sizeof(*image));
image->head = 0;
image->entry = &image->head;
@ -145,6 +148,7 @@ static int do_kimage_alloc(struct kimage **rimage, unsigned long entry,
result = -EADDRNOTAVAIL;
for (i = 0; i < nr_segments; i++) {
unsigned long mstart, mend;
mstart = image->segment[i].mem;
mend = mstart + image->segment[i].memsz;
if ((mstart & ~PAGE_MASK) || (mend & ~PAGE_MASK))
@ -159,12 +163,13 @@ static int do_kimage_alloc(struct kimage **rimage, unsigned long entry,
* easy explanation as one segment stops on another.
*/
result = -EINVAL;
for(i = 0; i < nr_segments; i++) {
for (i = 0; i < nr_segments; i++) {
unsigned long mstart, mend;
unsigned long j;
mstart = image->segment[i].mem;
mend = mstart + image->segment[i].memsz;
for(j = 0; j < i; j++) {
for (j = 0; j < i; j++) {
unsigned long pstart, pend;
pstart = image->segment[j].mem;
pend = pstart + image->segment[j].memsz;
@ -180,25 +185,25 @@ static int do_kimage_alloc(struct kimage **rimage, unsigned long entry,
* later on.
*/
result = -EINVAL;
for(i = 0; i < nr_segments; i++) {
for (i = 0; i < nr_segments; i++) {
if (image->segment[i].bufsz > image->segment[i].memsz)
goto out;
}
result = 0;
out:
if (result == 0) {
out:
if (result == 0)
*rimage = image;
} else {
else
kfree(image);
}
return result;
}
static int kimage_normal_alloc(struct kimage **rimage, unsigned long entry,
unsigned long nr_segments, struct kexec_segment __user *segments)
unsigned long nr_segments,
struct kexec_segment __user *segments)
{
int result;
struct kimage *image;
@ -206,9 +211,9 @@ static int kimage_normal_alloc(struct kimage **rimage, unsigned long entry,
/* Allocate and initialize a controlling structure */
image = NULL;
result = do_kimage_alloc(&image, entry, nr_segments, segments);
if (result) {
if (result)
goto out;
}
*rimage = image;
/*
@ -218,7 +223,7 @@ static int kimage_normal_alloc(struct kimage **rimage, unsigned long entry,
*/
result = -ENOMEM;
image->control_code_page = kimage_alloc_control_pages(image,
get_order(KEXEC_CONTROL_CODE_SIZE));
get_order(KEXEC_CONTROL_CODE_SIZE));
if (!image->control_code_page) {
printk(KERN_ERR "Could not allocate control_code_buffer\n");
goto out;
@ -226,16 +231,17 @@ static int kimage_normal_alloc(struct kimage **rimage, unsigned long entry,
result = 0;
out:
if (result == 0) {
if (result == 0)
*rimage = image;
} else {
else
kfree(image);
}
return result;
}
static int kimage_crash_alloc(struct kimage **rimage, unsigned long entry,
unsigned long nr_segments, struct kexec_segment *segments)
unsigned long nr_segments,
struct kexec_segment *segments)
{
int result;
struct kimage *image;
@ -250,9 +256,8 @@ static int kimage_crash_alloc(struct kimage **rimage, unsigned long entry,
/* Allocate and initialize a controlling structure */
result = do_kimage_alloc(&image, entry, nr_segments, segments);
if (result) {
if (result)
goto out;
}
/* Enable the special crash kernel control page
* allocation policy.
@ -272,6 +277,7 @@ static int kimage_crash_alloc(struct kimage **rimage, unsigned long entry,
result = -EADDRNOTAVAIL;
for (i = 0; i < nr_segments; i++) {
unsigned long mstart, mend;
mstart = image->segment[i].mem;
mend = mstart + image->segment[i].memsz - 1;
/* Ensure we are within the crash kernel limits */
@ -279,7 +285,6 @@ static int kimage_crash_alloc(struct kimage **rimage, unsigned long entry,
goto out;
}
/*
* Find a location for the control code buffer, and add
* the vector of segments so that it's pages will also be
@ -287,80 +292,84 @@ static int kimage_crash_alloc(struct kimage **rimage, unsigned long entry,
*/
result = -ENOMEM;
image->control_code_page = kimage_alloc_control_pages(image,
get_order(KEXEC_CONTROL_CODE_SIZE));
get_order(KEXEC_CONTROL_CODE_SIZE));
if (!image->control_code_page) {
printk(KERN_ERR "Could not allocate control_code_buffer\n");
goto out;
}
result = 0;
out:
if (result == 0) {
out:
if (result == 0)
*rimage = image;
} else {
else
kfree(image);
}
return result;
}
static int kimage_is_destination_range(
struct kimage *image, unsigned long start, unsigned long end)
static int kimage_is_destination_range(struct kimage *image,
unsigned long start,
unsigned long end)
{
unsigned long i;
for (i = 0; i < image->nr_segments; i++) {
unsigned long mstart, mend;
mstart = image->segment[i].mem;
mend = mstart + image->segment[i].memsz;
if ((end > mstart) && (start < mend)) {
mend = mstart + image->segment[i].memsz;
if ((end > mstart) && (start < mend))
return 1;
}
}
return 0;
}
static struct page *kimage_alloc_pages(unsigned int gfp_mask, unsigned int order)
static struct page *kimage_alloc_pages(unsigned int gfp_mask,
unsigned int order)
{
struct page *pages;
pages = alloc_pages(gfp_mask, order);
if (pages) {
unsigned int count, i;
pages->mapping = NULL;
pages->private = order;
count = 1 << order;
for(i = 0; i < count; i++) {
for (i = 0; i < count; i++)
SetPageReserved(pages + i);
}
}
return pages;
}
static void kimage_free_pages(struct page *page)
{
unsigned int order, count, i;
order = page->private;
count = 1 << order;
for(i = 0; i < count; i++) {
for (i = 0; i < count; i++)
ClearPageReserved(page + i);
}
__free_pages(page, order);
}
static void kimage_free_page_list(struct list_head *list)
{
struct list_head *pos, *next;
list_for_each_safe(pos, next, list) {
struct page *page;
page = list_entry(pos, struct page, lru);
list_del(&page->lru);
kimage_free_pages(page);
}
}
static struct page *kimage_alloc_normal_control_pages(
struct kimage *image, unsigned int order)
static struct page *kimage_alloc_normal_control_pages(struct kimage *image,
unsigned int order)
{
/* Control pages are special, they are the intermediaries
* that are needed while we copy the rest of the pages
@ -387,6 +396,7 @@ static struct page *kimage_alloc_normal_control_pages(
*/
do {
unsigned long pfn, epfn, addr, eaddr;
pages = kimage_alloc_pages(GFP_KERNEL, order);
if (!pages)
break;
@ -395,12 +405,12 @@ static struct page *kimage_alloc_normal_control_pages(
addr = pfn << PAGE_SHIFT;
eaddr = epfn << PAGE_SHIFT;
if ((epfn >= (KEXEC_CONTROL_MEMORY_LIMIT >> PAGE_SHIFT)) ||
kimage_is_destination_range(image, addr, eaddr))
{
kimage_is_destination_range(image, addr, eaddr)) {
list_add(&pages->lru, &extra_pages);
pages = NULL;
}
} while(!pages);
} while (!pages);
if (pages) {
/* Remember the allocated page... */
list_add(&pages->lru, &image->control_pages);
@ -420,12 +430,12 @@ static struct page *kimage_alloc_normal_control_pages(
* For now it is simpler to just free the pages.
*/
kimage_free_page_list(&extra_pages);
return pages;
return pages;
}
static struct page *kimage_alloc_crash_control_pages(
struct kimage *image, unsigned int order)
static struct page *kimage_alloc_crash_control_pages(struct kimage *image,
unsigned int order)
{
/* Control pages are special, they are the intermediaries
* that are needed while we copy the rest of the pages
@ -450,21 +460,22 @@ static struct page *kimage_alloc_crash_control_pages(
*/
unsigned long hole_start, hole_end, size;
struct page *pages;
pages = NULL;
size = (1 << order) << PAGE_SHIFT;
hole_start = (image->control_page + (size - 1)) & ~(size - 1);
hole_end = hole_start + size - 1;
while(hole_end <= crashk_res.end) {
while (hole_end <= crashk_res.end) {
unsigned long i;
if (hole_end > KEXEC_CONTROL_MEMORY_LIMIT) {
if (hole_end > KEXEC_CONTROL_MEMORY_LIMIT)
break;
}
if (hole_end > crashk_res.end) {
if (hole_end > crashk_res.end)
break;
}
/* See if I overlap any of the segments */
for(i = 0; i < image->nr_segments; i++) {
for (i = 0; i < image->nr_segments; i++) {
unsigned long mstart, mend;
mstart = image->segment[i].mem;
mend = mstart + image->segment[i].memsz - 1;
if ((hole_end >= mstart) && (hole_start <= mend)) {
@ -480,18 +491,19 @@ static struct page *kimage_alloc_crash_control_pages(
break;
}
}
if (pages) {
if (pages)
image->control_page = hole_end;
}
return pages;
}
struct page *kimage_alloc_control_pages(
struct kimage *image, unsigned int order)
struct page *kimage_alloc_control_pages(struct kimage *image,
unsigned int order)
{
struct page *pages = NULL;
switch(image->type) {
switch (image->type) {
case KEXEC_TYPE_DEFAULT:
pages = kimage_alloc_normal_control_pages(image, order);
break;
@ -499,43 +511,46 @@ struct page *kimage_alloc_control_pages(
pages = kimage_alloc_crash_control_pages(image, order);
break;
}
return pages;
}
static int kimage_add_entry(struct kimage *image, kimage_entry_t entry)
{
if (*image->entry != 0) {
if (*image->entry != 0)
image->entry++;
}
if (image->entry == image->last_entry) {
kimage_entry_t *ind_page;
struct page *page;
page = kimage_alloc_page(image, GFP_KERNEL, KIMAGE_NO_DEST);
if (!page) {
if (!page)
return -ENOMEM;
}
ind_page = page_address(page);
*image->entry = virt_to_phys(ind_page) | IND_INDIRECTION;
image->entry = ind_page;
image->last_entry =
ind_page + ((PAGE_SIZE/sizeof(kimage_entry_t)) - 1);
image->last_entry = ind_page +
((PAGE_SIZE/sizeof(kimage_entry_t)) - 1);
}
*image->entry = entry;
image->entry++;
*image->entry = 0;
return 0;
}
static int kimage_set_destination(
struct kimage *image, unsigned long destination)
static int kimage_set_destination(struct kimage *image,
unsigned long destination)
{
int result;
destination &= PAGE_MASK;
result = kimage_add_entry(image, destination | IND_DESTINATION);
if (result == 0) {
if (result == 0)
image->destination = destination;
}
return result;
}
@ -546,9 +561,9 @@ static int kimage_add_page(struct kimage *image, unsigned long page)
page &= PAGE_MASK;
result = kimage_add_entry(image, page | IND_SOURCE);
if (result == 0) {
if (result == 0)
image->destination += PAGE_SIZE;
}
return result;
}
@ -564,10 +579,11 @@ static void kimage_free_extra_pages(struct kimage *image)
}
static int kimage_terminate(struct kimage *image)
{
if (*image->entry != 0) {
if (*image->entry != 0)
image->entry++;
}
*image->entry = IND_DONE;
return 0;
}
@ -591,26 +607,24 @@ static void kimage_free(struct kimage *image)
if (!image)
return;
kimage_free_extra_pages(image);
for_each_kimage_entry(image, ptr, entry) {
if (entry & IND_INDIRECTION) {
/* Free the previous indirection page */
if (ind & IND_INDIRECTION) {
if (ind & IND_INDIRECTION)
kimage_free_entry(ind);
}
/* Save this indirection page until we are
* done with it.
*/
ind = entry;
}
else if (entry & IND_SOURCE) {
else if (entry & IND_SOURCE)
kimage_free_entry(entry);
}
}
/* Free the final indirection page */
if (ind & IND_INDIRECTION) {
if (ind & IND_INDIRECTION)
kimage_free_entry(ind);
}
/* Handle any machine specific cleanup */
machine_kexec_cleanup(image);
@ -620,26 +634,28 @@ static void kimage_free(struct kimage *image)
kfree(image);
}
static kimage_entry_t *kimage_dst_used(struct kimage *image, unsigned long page)
static kimage_entry_t *kimage_dst_used(struct kimage *image,
unsigned long page)
{
kimage_entry_t *ptr, entry;
unsigned long destination = 0;
for_each_kimage_entry(image, ptr, entry) {
if (entry & IND_DESTINATION) {
if (entry & IND_DESTINATION)
destination = entry & PAGE_MASK;
}
else if (entry & IND_SOURCE) {
if (page == destination) {
if (page == destination)
return ptr;
}
destination += PAGE_SIZE;
}
}
return 0;
}
static struct page *kimage_alloc_page(struct kimage *image, unsigned int gfp_mask, unsigned long destination)
static struct page *kimage_alloc_page(struct kimage *image,
unsigned int gfp_mask,
unsigned long destination)
{
/*
* Here we implement safeguards to ensure that a source page
@ -679,11 +695,11 @@ static struct page *kimage_alloc_page(struct kimage *image, unsigned int gfp_mas
/* Allocate a page, if we run out of memory give up */
page = kimage_alloc_pages(gfp_mask, 0);
if (!page) {
if (!page)
return 0;
}
/* If the page cannot be used file it away */
if (page_to_pfn(page) > (KEXEC_SOURCE_MEMORY_LIMIT >> PAGE_SHIFT)) {
if (page_to_pfn(page) >
(KEXEC_SOURCE_MEMORY_LIMIT >> PAGE_SHIFT)) {
list_add(&page->lru, &image->unuseable_pages);
continue;
}
@ -694,7 +710,8 @@ static struct page *kimage_alloc_page(struct kimage *image, unsigned int gfp_mas
break;
/* If the page is not a destination page use it */
if (!kimage_is_destination_range(image, addr, addr + PAGE_SIZE))
if (!kimage_is_destination_range(image, addr,
addr + PAGE_SIZE))
break;
/*
@ -727,11 +744,12 @@ static struct page *kimage_alloc_page(struct kimage *image, unsigned int gfp_mas
list_add(&page->lru, &image->dest_pages);
}
}
return page;
}
static int kimage_load_normal_segment(struct kimage *image,
struct kexec_segment *segment)
struct kexec_segment *segment)
{
unsigned long maddr;
unsigned long ubytes, mbytes;
@ -745,34 +763,36 @@ static int kimage_load_normal_segment(struct kimage *image,
maddr = segment->mem;
result = kimage_set_destination(image, maddr);
if (result < 0) {
if (result < 0)
goto out;
}
while(mbytes) {
while (mbytes) {
struct page *page;
char *ptr;
size_t uchunk, mchunk;
page = kimage_alloc_page(image, GFP_HIGHUSER, maddr);
if (page == 0) {
result = -ENOMEM;
goto out;
}
result = kimage_add_page(image, page_to_pfn(page) << PAGE_SHIFT);
if (result < 0) {
result = kimage_add_page(image, page_to_pfn(page)
<< PAGE_SHIFT);
if (result < 0)
goto out;
}
ptr = kmap(page);
/* Start with a clear page */
memset(ptr, 0, PAGE_SIZE);
ptr += maddr & ~PAGE_MASK;
mchunk = PAGE_SIZE - (maddr & ~PAGE_MASK);
if (mchunk > mbytes) {
if (mchunk > mbytes)
mchunk = mbytes;
}
uchunk = mchunk;
if (uchunk > ubytes) {
if (uchunk > ubytes)
uchunk = ubytes;
}
result = copy_from_user(ptr, buf, uchunk);
kunmap(page);
if (result) {
@ -784,12 +804,12 @@ static int kimage_load_normal_segment(struct kimage *image,
buf += mchunk;
mbytes -= mchunk;
}
out:
out:
return result;
}
static int kimage_load_crash_segment(struct kimage *image,
struct kexec_segment *segment)
struct kexec_segment *segment)
{
/* For crash dumps kernels we simply copy the data from
* user space to it's destination.
@ -805,10 +825,11 @@ static int kimage_load_crash_segment(struct kimage *image,
ubytes = segment->bufsz;
mbytes = segment->memsz;
maddr = segment->mem;
while(mbytes) {
while (mbytes) {
struct page *page;
char *ptr;
size_t uchunk, mchunk;
page = pfn_to_page(maddr >> PAGE_SHIFT);
if (page == 0) {
result = -ENOMEM;
@ -817,9 +838,9 @@ static int kimage_load_crash_segment(struct kimage *image,
ptr = kmap(page);
ptr += maddr & ~PAGE_MASK;
mchunk = PAGE_SIZE - (maddr & ~PAGE_MASK);
if (mchunk > mbytes) {
if (mchunk > mbytes)
mchunk = mbytes;
}
uchunk = mchunk;
if (uchunk > ubytes) {
uchunk = ubytes;
@ -837,15 +858,16 @@ static int kimage_load_crash_segment(struct kimage *image,
buf += mchunk;
mbytes -= mchunk;
}
out:
out:
return result;
}
static int kimage_load_segment(struct kimage *image,
struct kexec_segment *segment)
struct kexec_segment *segment)
{
int result = -ENOMEM;
switch(image->type) {
switch (image->type) {
case KEXEC_TYPE_DEFAULT:
result = kimage_load_normal_segment(image, segment);
break;
@ -853,6 +875,7 @@ static int kimage_load_segment(struct kimage *image,
result = kimage_load_crash_segment(image, segment);
break;
}
return result;
}
@ -885,9 +908,9 @@ static struct kimage *kexec_crash_image = NULL;
*/
static int kexec_lock = 0;
asmlinkage long sys_kexec_load(unsigned long entry,
unsigned long nr_segments, struct kexec_segment __user *segments,
unsigned long flags)
asmlinkage long sys_kexec_load(unsigned long entry, unsigned long nr_segments,
struct kexec_segment __user *segments,
unsigned long flags)
{
struct kimage **dest_image, *image;
int locked;
@ -907,9 +930,7 @@ asmlinkage long sys_kexec_load(unsigned long entry,
/* Verify we are on the appropriate architecture */
if (((flags & KEXEC_ARCH_MASK) != KEXEC_ARCH) &&
((flags & KEXEC_ARCH_MASK) != KEXEC_ARCH_DEFAULT))
{
return -EINVAL;
}
/* Put an artificial cap on the number
* of segments passed to kexec_load.
@ -929,58 +950,59 @@ asmlinkage long sys_kexec_load(unsigned long entry,
* KISS: always take the mutex.
*/
locked = xchg(&kexec_lock, 1);
if (locked) {
if (locked)
return -EBUSY;
}
dest_image = &kexec_image;
if (flags & KEXEC_ON_CRASH) {
if (flags & KEXEC_ON_CRASH)
dest_image = &kexec_crash_image;
}
if (nr_segments > 0) {
unsigned long i;
/* Loading another kernel to reboot into */
if ((flags & KEXEC_ON_CRASH) == 0) {
result = kimage_normal_alloc(&image, entry, nr_segments, segments);
}
if ((flags & KEXEC_ON_CRASH) == 0)
result = kimage_normal_alloc(&image, entry,
nr_segments, segments);
/* Loading another kernel to switch to if this one crashes */
else if (flags & KEXEC_ON_CRASH) {
/* Free any current crash dump kernel before
* we corrupt it.
*/
kimage_free(xchg(&kexec_crash_image, NULL));
result = kimage_crash_alloc(&image, entry, nr_segments, segments);
result = kimage_crash_alloc(&image, entry,
nr_segments, segments);
}
if (result) {
if (result)
goto out;
}
result = machine_kexec_prepare(image);
if (result) {
if (result)
goto out;
}
for(i = 0; i < nr_segments; i++) {
for (i = 0; i < nr_segments; i++) {
result = kimage_load_segment(image, &image->segment[i]);
if (result) {
if (result)
goto out;
}
}
result = kimage_terminate(image);
if (result) {
if (result)
goto out;
}
}
/* Install the new kernel, and Uninstall the old */
image = xchg(dest_image, image);
out:
out:
xchg(&kexec_lock, 0); /* Release the mutex */
kimage_free(image);
return result;
}
#ifdef CONFIG_COMPAT
asmlinkage long compat_sys_kexec_load(unsigned long entry,
unsigned long nr_segments, struct compat_kexec_segment __user *segments,
unsigned long flags)
unsigned long nr_segments,
struct compat_kexec_segment __user *segments,
unsigned long flags)
{
struct compat_kexec_segment in;
struct kexec_segment out, __user *ksegments;
@ -989,20 +1011,17 @@ asmlinkage long compat_sys_kexec_load(unsigned long entry,
/* Don't allow clients that don't understand the native
* architecture to do anything.
*/
if ((flags & KEXEC_ARCH_MASK) == KEXEC_ARCH_DEFAULT) {
if ((flags & KEXEC_ARCH_MASK) == KEXEC_ARCH_DEFAULT)
return -EINVAL;
}
if (nr_segments > KEXEC_SEGMENT_MAX) {
if (nr_segments > KEXEC_SEGMENT_MAX)
return -EINVAL;
}
ksegments = compat_alloc_user_space(nr_segments * sizeof(out));
for (i=0; i < nr_segments; i++) {
result = copy_from_user(&in, &segments[i], sizeof(in));
if (result) {
if (result)
return -EFAULT;
}
out.buf = compat_ptr(in.buf);
out.bufsz = in.bufsz;
@ -1010,9 +1029,8 @@ asmlinkage long compat_sys_kexec_load(unsigned long entry,
out.memsz = in.memsz;
result = copy_to_user(&ksegments[i], &out, sizeof(out));
if (result) {
if (result)
return -EFAULT;
}
}
return sys_kexec_load(entry, nr_segments, ksegments, flags);