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authorWu Fengguang <fengguang.wu@intel.com>2009-12-16 12:19:58 +0100
committerAndi Kleen <ak@linux.intel.com>2009-12-16 12:19:58 +0100
commit847ce401df392b0704369fd3f75df614ac1414b4 (patch)
tree7c5021386dedea0d12f8a05b00c5267c4d28e426 /include
parent8d22ba1b74aa9420b6032d856446564fb21f8090 (diff)
downloadop-kernel-dev-847ce401df392b0704369fd3f75df614ac1414b4.zip
op-kernel-dev-847ce401df392b0704369fd3f75df614ac1414b4.tar.gz
HWPOISON: Add unpoisoning support
The unpoisoning interface is useful for stress testing tools to reclaim poisoned pages (to prevent OOM) There is no hardware level unpoisioning, so this cannot be used for real memory errors, only for software injected errors. Note that it may leak pages silently - those who have been removed from LRU cache, but not isolated from page cache/swap cache at hwpoison time. Especially the stress test of dirty swap cache pages shall reboot system before exhausting memory. AK: Fix comments, add documentation, add printks, rename symbol Signed-off-by: Wu Fengguang <fengguang.wu@intel.com> Signed-off-by: Andi Kleen <ak@linux.intel.com>
Diffstat (limited to 'include')
-rw-r--r--include/linux/mm.h1
-rw-r--r--include/linux/page-flags.h2
2 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 135e191..8cdb941 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1336,6 +1336,7 @@ enum mf_flags {
};
extern void memory_failure(unsigned long pfn, int trapno);
extern int __memory_failure(unsigned long pfn, int trapno, int flags);
+extern int unpoison_memory(unsigned long pfn);
extern int sysctl_memory_failure_early_kill;
extern int sysctl_memory_failure_recovery;
extern void shake_page(struct page *p);
diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index 49e907b..f9df630 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -275,7 +275,7 @@ PAGEFLAG_FALSE(Uncached)
#ifdef CONFIG_MEMORY_FAILURE
PAGEFLAG(HWPoison, hwpoison)
-TESTSETFLAG(HWPoison, hwpoison)
+TESTSCFLAG(HWPoison, hwpoison)
#define __PG_HWPOISON (1UL << PG_hwpoison)
#else
PAGEFLAG_FALSE(HWPoison)
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