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Merge branch 'for-linus' of git://git390.marist.edu/pub/scm/linux-2.6

Browse source 
* 'for-linus' of git://git390.marist.edu/pub/scm/linux-2.6:
  [S390] make page table upgrade work again
  [S390] make page table walking more robust
  [S390] Dont check for pfn_valid() in uaccess_pt.c
  [S390] ftrace/mcount: fix kernel stack backchain
  [S390] topology: define SD_MC_INIT to fix performance regression
  [S390] __div64_31 broken for CONFIG_MARCH_G5
This commit is contained in:
Linus Torvalds 2009-03-19 14:56:35 -07:00
commit caa81d671f
8 changed files with 48 additions and 40 deletions
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5
arch/s390/include/asm/mman.h
View file

@ -22,4 +22,9 @@
#define MCL_CURRENT 1 /* lock all current mappings */
#define MCL_FUTURE 2 /* lock all future mappings */
#if defined(__KERNEL__) && !defined(__ASSEMBLY__) && defined(CONFIG_64BIT)
int s390_mmap_check(unsigned long addr, unsigned long len);
#define arch_mmap_check(addr,len,flags) s390_mmap_check(addr,len)
#endif
#endif /* __S390_MMAN_H__ */

5
arch/s390/include/asm/processor.h
View file

@ -61,7 +61,7 @@ extern void print_cpu_info(struct cpuinfo_S390 *);
extern int get_cpu_capability(unsigned int *);
/*
* User space process size: 2GB for 31 bit, 4TB for 64 bit.
* User space process size: 2GB for 31 bit, 4TB or 8PT for 64 bit.
*/
#ifndef __s390x__
@ -70,8 +70,7 @@ extern int get_cpu_capability(unsigned int *);
#else /* __s390x__ */
#define TASK_SIZE_OF(tsk) (test_tsk_thread_flag(tsk,TIF_31BIT) ? \
(1UL << 31) : (1UL << 53))
#define TASK_SIZE_OF(tsk) ((tsk)->mm->context.asce_limit)
#define TASK_UNMAPPED_BASE (test_thread_flag(TIF_31BIT) ? \
(1UL << 30) : (1UL << 41))
#define TASK_SIZE TASK_SIZE_OF(current)

2
arch/s390/include/asm/topology.h
View file

@ -30,6 +30,8 @@ static inline void s390_init_cpu_topology(void)
};
#endif
#define SD_MC_INIT SD_CPU_INIT
#include <asm-generic/topology.h>
#endif /* _ASM_S390_TOPOLOGY_H */

6
arch/s390/kernel/mcount.S
View file

@ -5,6 +5,8 @@
*
*/
#include <asm/asm-offsets.h>
#ifndef CONFIG_64BIT
.globl _mcount
_mcount:
@ -14,7 +16,7 @@ _mcount:
ahi %r15,-96
l %r3,100(%r15)
la %r2,0(%r14)
st %r1,0(%r15)
st %r1,__SF_BACKCHAIN(%r15)
la %r3,0(%r3)
bras %r14,0f
.long ftrace_trace_function
@ -38,7 +40,7 @@ _mcount:
stg %r14,112(%r15)
lgr %r1,%r15
aghi %r15,-160
stg %r1,0(%r15)
stg %r1,__SF_BACKCHAIN(%r15)
lgr %r2,%r14
lg %r3,168(%r15)
larl %r14,ftrace_trace_function

2
arch/s390/lib/div64.c
View file

@ -61,7 +61,7 @@ static uint32_t __div64_31(uint64_t *n, uint32_t base)
" clr %0,%3\n"
" jl 0f\n"
" slr %0,%3\n"
" alr %1,%2\n"
" ahi %1,1\n"
"0:\n"
: "+d" (reg2), "+d" (reg3), "=d" (tmp)
: "d" (base), "2" (1UL) : "cc" );

18
arch/s390/lib/uaccess_pt.c
View file

@ -119,8 +119,6 @@ retry:
goto fault;
pfn = pte_pfn(*pte);
if (!pfn_valid(pfn))
goto out;
offset = uaddr & (PAGE_SIZE - 1);
size = min(n - done, PAGE_SIZE - offset);
@ -135,7 +133,6 @@ retry:
done += size;
uaddr += size;
} while (done < n);
out:
spin_unlock(&mm->page_table_lock);
return n - done;
fault:
@ -163,9 +160,6 @@ retry:
goto fault;
pfn = pte_pfn(*pte);
if (!pfn_valid(pfn))
goto out;
ret = (pfn << PAGE_SHIFT) + (uaddr & (PAGE_SIZE - 1));
out:
return ret;
@ -244,11 +238,6 @@ retry:
goto fault;
pfn = pte_pfn(*pte);
if (!pfn_valid(pfn)) {
done = -1;
goto out;
}
offset = uaddr & (PAGE_SIZE-1);
addr = (char *)(pfn << PAGE_SHIFT) + offset;
len = min(count - done, PAGE_SIZE - offset);
@ -256,7 +245,6 @@ retry:
done += len_str;
uaddr += len_str;
} while ((len_str == len) && (done < count));
out:
spin_unlock(&mm->page_table_lock);
return done + 1;
fault:
@ -325,12 +313,7 @@ retry:
}
pfn_from = pte_pfn(*pte_from);
if (!pfn_valid(pfn_from))
goto out;
pfn_to = pte_pfn(*pte_to);
if (!pfn_valid(pfn_to))
goto out;
offset_from = uaddr_from & (PAGE_SIZE-1);
offset_to = uaddr_from & (PAGE_SIZE-1);
offset_max = max(offset_from, offset_to);
@ -342,7 +325,6 @@ retry:
uaddr_from += size;
uaddr_to += size;
} while (done < n);
out:
spin_unlock(&mm->page_table_lock);
return n - done;
fault:

48
arch/s390/mm/mmap.c
View file

@ -35,7 +35,7 @@
* Leave an at least ~128 MB hole.
*/
#define MIN_GAP (128*1024*1024)
#define MAX_GAP (TASK_SIZE/6*5)
#define MAX_GAP (STACK_TOP/6*5)
static inline unsigned long mmap_base(void)
{
@ -46,7 +46,7 @@ static inline unsigned long mmap_base(void)
else if (gap > MAX_GAP)
gap = MAX_GAP;
return TASK_SIZE - (gap & PAGE_MASK);
return STACK_TOP - (gap & PAGE_MASK);
}
static inline int mmap_is_legacy(void)
@ -89,42 +89,58 @@ EXPORT_SYMBOL_GPL(arch_pick_mmap_layout);
#else
int s390_mmap_check(unsigned long addr, unsigned long len)
{
if (!test_thread_flag(TIF_31BIT) &&
len >= TASK_SIZE && TASK_SIZE < (1UL << 53))
return crst_table_upgrade(current->mm, 1UL << 53);
return 0;
}
static unsigned long
s390_get_unmapped_area(struct file *filp, unsigned long addr,
unsigned long len, unsigned long pgoff, unsigned long flags)
{
struct mm_struct *mm = current->mm;
unsigned long area;
int rc;
addr = arch_get_unmapped_area(filp, addr, len, pgoff, flags);
if (addr & ~PAGE_MASK)
return addr;
if (unlikely(mm->context.asce_limit < addr + len)) {
rc = crst_table_upgrade(mm, addr + len);
area = arch_get_unmapped_area(filp, addr, len, pgoff, flags);
if (!(area & ~PAGE_MASK))
return area;
if (area == -ENOMEM &&
!test_thread_flag(TIF_31BIT) && TASK_SIZE < (1UL << 53)) {
/* Upgrade the page table to 4 levels and retry. */
rc = crst_table_upgrade(mm, 1UL << 53);
if (rc)
return (unsigned long) rc;
area = arch_get_unmapped_area(filp, addr, len, pgoff, flags);
}
return addr;
return area;
}
static unsigned long
s390_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
s390_get_unmapped_area_topdown(struct file *filp, const unsigned long addr,
const unsigned long len, const unsigned long pgoff,
const unsigned long flags)
{
struct mm_struct *mm = current->mm;
unsigned long addr = addr0;
unsigned long area;
int rc;
addr = arch_get_unmapped_area_topdown(filp, addr, len, pgoff, flags);
if (addr & ~PAGE_MASK)
return addr;
if (unlikely(mm->context.asce_limit < addr + len)) {
rc = crst_table_upgrade(mm, addr + len);
area = arch_get_unmapped_area_topdown(filp, addr, len, pgoff, flags);
if (!(area & ~PAGE_MASK))
return area;
if (area == -ENOMEM &&
!test_thread_flag(TIF_31BIT) && TASK_SIZE < (1UL << 53)) {
/* Upgrade the page table to 4 levels and retry. */
rc = crst_table_upgrade(mm, 1UL << 53);
if (rc)
return (unsigned long) rc;
area = arch_get_unmapped_area_topdown(filp, addr, len,
pgoff, flags);
}
return addr;
return area;
}
/*
* This function, called very early during the creation of a new

2
arch/s390/mm/pgtable.c
View file

@ -117,6 +117,7 @@ repeat:
crst_table_init(table, entry);
pgd_populate(mm, (pgd_t *) table, (pud_t *) pgd);
mm->pgd = (pgd_t *) table;
mm->task_size = mm->context.asce_limit;
table = NULL;
}
spin_unlock(&mm->page_table_lock);
@ -154,6 +155,7 @@ void crst_table_downgrade(struct mm_struct *mm, unsigned long limit)
BUG();
}
mm->pgd = (pgd_t *) (pgd_val(*pgd) & _REGION_ENTRY_ORIGIN);
mm->task_size = mm->context.asce_limit;
crst_table_free(mm, (unsigned long *) pgd);
}
update_mm(mm, current);