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authorHuang Ying <ying.huang@intel.com>2011-01-29 22:15:48 -0500
committerMarcelo Tosatti <mtosatti@redhat.com>2011-03-17 12:08:27 -0400
commit69ebb83e13e514222b0ae4f8bd813a17679ed876 (patch)
tree62ccc7ee1e840d0a6cc01a9fc1c44a5f4e6f1edd /arch/sparc/include
parent0014bd990e69063b0fb78940b35439d7980ce3ee (diff)
mm: make __get_user_pages return -EHWPOISON for HWPOISON page optionally
Make __get_user_pages return -EHWPOISON for HWPOISON page only if FOLL_HWPOISON is specified. With this patch, the interested callers can distinguish HWPOISON pages from general FAULT pages, while other callers will still get -EFAULT for all these pages, so the user space interface need not to be changed. This feature is needed by KVM, where UCR MCE should be relayed to guest for HWPOISON page, while instruction emulation and MMIO will be tried for general FAULT page. The idea comes from Andrew Morton. Signed-off-by: Huang Ying <ying.huang@intel.com> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch/sparc/include')
-rw-r--r--arch/sparc/include/asm/errno.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/sparc/include/asm/errno.h b/arch/sparc/include/asm/errno.h
index 4e2bc490d714..c351aba997b7 100644
--- a/arch/sparc/include/asm/errno.h
+++ b/arch/sparc/include/asm/errno.h
@@ -112,4 +112,6 @@
112 112
113#define ERFKILL 134 /* Operation not possible due to RF-kill */ 113#define ERFKILL 134 /* Operation not possible due to RF-kill */
114 114
115#define EHWPOISON 135 /* Memory page has hardware error */
116
115#endif 117#endif