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x86: change_page_attr bandaids

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- Disable CLFLUSH again; it is still broken. Always do WBINVD.
- Always flush in the i386 case, not only when there are deferred pages.

These are both brute-force inefficient fixes, to be improved
next release cycle.

The changes to i386 are a little more extensive than strictly
needed (some dead code added), but it is more similar to the x86-64 version
now and the dead code will be used soon.

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andi Kleen 2007-06-20 12:23:36 +02:00 committed by Linus Torvalds
parent 55181000cd
commit 018d2ad0cc
2 changed files with 22 additions and 15 deletions
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30
arch/i386/mm/pageattr.c
View file

@ -68,14 +68,23 @@ static struct page *split_large_page(unsigned long address, pgprot_t prot,
return base;
}
static void flush_kernel_map(void *arg)
static void cache_flush_page(struct page *p)
{
unsigned long adr = (unsigned long)arg;
unsigned long adr = (unsigned long)page_address(p);
int i;
for (i = 0; i < PAGE_SIZE; i += boot_cpu_data.x86_clflush_size)
asm volatile("clflush (%0)" :: "r" (adr + i));
}
if (adr && cpu_has_clflush) {
int i;
for (i = 0; i < PAGE_SIZE; i += boot_cpu_data.x86_clflush_size)
asm volatile("clflush (%0)" :: "r" (adr + i));
static void flush_kernel_map(void *arg)
{
struct list_head *lh = (struct list_head *)arg;
struct page *p;
/* High level code is not ready for clflush yet */
if (0 && cpu_has_clflush) {
list_for_each_entry (p, lh, lru)
cache_flush_page(p);
} else if (boot_cpu_data.x86_model >= 4)
wbinvd();
@ -181,9 +190,9 @@ __change_page_attr(struct page *page, pgprot_t prot)
return 0;
}
static inline void flush_map(void *adr)
static inline void flush_map(struct list_head *l)
{
on_each_cpu(flush_kernel_map, adr, 1, 1);
on_each_cpu(flush_kernel_map, l, 1, 1);
}
/*
@ -225,11 +234,8 @@ void global_flush_tlb(void)
spin_lock_irq(&cpa_lock);
list_replace_init(&df_list, &l);
spin_unlock_irq(&cpa_lock);
if (!cpu_has_clflush)
flush_map(NULL);
flush_map(&l);
list_for_each_entry_safe(pg, next, &l, lru) {
if (cpu_has_clflush)
flush_map(page_address(pg));
__free_page(pg);
}
}

7
arch/x86_64/mm/pageattr.c
View file

@ -74,10 +74,11 @@ static void flush_kernel_map(void *arg)
struct page *pg;
/* When clflush is available always use it because it is
much cheaper than WBINVD */
if (!cpu_has_clflush)
much cheaper than WBINVD. Disable clflush for now because
the high level code is not ready yet */
if (1 || !cpu_has_clflush)
asm volatile("wbinvd" ::: "memory");
list_for_each_entry(pg, l, lru) {
else list_for_each_entry(pg, l, lru) {
void *adr = page_address(pg);
if (cpu_has_clflush)
cache_flush_page(adr);