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| author | Huang Ying <ying.huang@intel.com> | 2011-01-30 11:15:48 +0800 |
|---|---|---|
| committer | Marcelo Tosatti <mtosatti@redhat.com> | 2011-03-17 13:08:27 -0300 |
| commit | 69ebb83e13e514222b0ae4f8bd813a17679ed876 (patch) | |
| tree | 62ccc7ee1e840d0a6cc01a9fc1c44a5f4e6f1edd /arch | |
| parent | 0014bd990e69063b0fb78940b35439d7980ce3ee (diff) | |
| download | linux-3.10-69ebb83e13e514222b0ae4f8bd813a17679ed876.tar.gz linux-3.10-69ebb83e13e514222b0ae4f8bd813a17679ed876.tar.bz2 linux-3.10-69ebb83e13e514222b0ae4f8bd813a17679ed876.zip | |
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')
| -rw-r--r-- | arch/alpha/include/asm/errno.h | 2 | ||||
| -rw-r--r-- | arch/mips/include/asm/errno.h | 2 | ||||
| -rw-r--r-- | arch/parisc/include/asm/errno.h | 2 | ||||
| -rw-r--r-- | arch/sparc/include/asm/errno.h | 2 |
4 files changed, 8 insertions, 0 deletions
diff --git a/arch/alpha/include/asm/errno.h b/arch/alpha/include/asm/errno.h index 98099bda937..e5f29ca2818 100644 --- a/arch/alpha/include/asm/errno.h +++ b/arch/alpha/include/asm/errno.h @@ -122,4 +122,6 @@ #define ERFKILL 138 /* Operation not possible due to RF-kill */ +#define EHWPOISON 139 /* Memory page has hardware error */ + #endif diff --git a/arch/mips/include/asm/errno.h b/arch/mips/include/asm/errno.h index a0efc73819e..6dcd3583ed0 100644 --- a/arch/mips/include/asm/errno.h +++ b/arch/mips/include/asm/errno.h @@ -121,6 +121,8 @@ #define ERFKILL 167 /* Operation not possible due to RF-kill */ +#define EHWPOISON 168 /* Memory page has hardware error */ + #define EDQUOT 1133 /* Quota exceeded */ #ifdef __KERNEL__ diff --git a/arch/parisc/include/asm/errno.h b/arch/parisc/include/asm/errno.h index 9992abdd782..135ad6047e5 100644 --- a/arch/parisc/include/asm/errno.h +++ b/arch/parisc/include/asm/errno.h @@ -122,4 +122,6 @@ #define ERFKILL 256 /* Operation not possible due to RF-kill */ +#define EHWPOISON 257 /* Memory page has hardware error */ + #endif diff --git a/arch/sparc/include/asm/errno.h b/arch/sparc/include/asm/errno.h index 4e2bc490d71..c351aba997b 100644 --- a/arch/sparc/include/asm/errno.h +++ b/arch/sparc/include/asm/errno.h @@ -112,4 +112,6 @@ #define ERFKILL 134 /* Operation not possible due to RF-kill */ +#define EHWPOISON 135 /* Memory page has hardware error */ + #endif |