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authorAndi Kleen <andi@firstfloor.org>2009-12-16 12:19:57 +0100
committerAndi Kleen <ak@linux.intel.com>2009-12-16 12:19:57 +0100
commit82ba011b9041dd31c15e4f63797b08aa0a288e61 (patch)
tree7fd48d31ab507007c37f89a9dc41256b8585d8db
parentbd1ce5f91f545730df4af492f774d9d32f5da3cb (diff)
HWPOISON: Turn ref argument into flags argument
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>
-rw-r--r--include/linux/mm.h5
-rw-r--r--mm/madvise.c2
-rw-r--r--mm/memory-failure.c5
3 files changed, 8 insertions, 4 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 68c84bb2ad3f..135e19198cd3 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -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);
diff --git a/mm/madvise.c b/mm/madvise.c
index 18970aec0d2f..6ca34f0cd4aa 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -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;
}
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 4253e14fa709..3338c443272c 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -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;
}