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HWPOISON: Turn ref argument into flags argument

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Now that "ref" is just a boolean turn it into
a flags argument. First step is only a single flag
that makes the code's intention more clear, but more
may follow.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
This commit is contained in:
Andi Kleen 2009-12-16 12:19:57 +01:00 committed by Andi Kleen
parent bd1ce5f91f
commit 82ba011b90
3 changed files with 8 additions and 4 deletions
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5
include/linux/mm.h
View file

@ -1331,8 +1331,11 @@ extern int account_locked_memory(struct mm_struct *mm, struct rlimit *rlim,
size_t size);
extern void refund_locked_memory(struct mm_struct *mm, size_t size);
enum mf_flags {
MF_COUNT_INCREASED = 1 << 0,
};
extern void memory_failure(unsigned long pfn, int trapno);
extern int __memory_failure(unsigned long pfn, int trapno, int ref);
extern int __memory_failure(unsigned long pfn, int trapno, int flags);
extern int sysctl_memory_failure_early_kill;
extern int sysctl_memory_failure_recovery;
extern void shake_page(struct page *p);

2
mm/madvise.c
View file

@ -237,7 +237,7 @@ static int madvise_hwpoison(unsigned long start, unsigned long end)
printk(KERN_INFO "Injecting memory failure for page %lx at %lx\n",
page_to_pfn(p), start);
/* Ignore return value for now */
__memory_failure(page_to_pfn(p), 0, 1);
__memory_failure(page_to_pfn(p), 0, MF_COUNT_INCREASED);
}
return ret;
}

5
mm/memory-failure.c
View file

@ -737,7 +737,7 @@ static void hwpoison_user_mappings(struct page *p, unsigned long pfn,
ret != SWAP_SUCCESS, pfn);
}
int __memory_failure(unsigned long pfn, int trapno, int ref)
int __memory_failure(unsigned long pfn, int trapno, int flags)
{
unsigned long lru_flag;
struct page_state *ps;
@ -773,7 +773,8 @@ int __memory_failure(unsigned long pfn, int trapno, int ref)
* In fact it's dangerous to directly bump up page count from 0,
* that may make page_freeze_refs()/page_unfreeze_refs() mismatch.
*/
if (!ref && !get_page_unless_zero(compound_head(p))) {
if (!(flags & MF_COUNT_INCREASED) &&
!get_page_unless_zero(compound_head(p))) {
action_result(pfn, "free or high order kernel", IGNORED);
return PageBuddy(compound_head(p)) ? 0 : -EBUSY;
}