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authorHuang Ying <ying.huang@intel.com>2011-01-30 11:15:48 +0800
committerMarcelo Tosatti <mtosatti@redhat.com>2011-03-17 13:08:27 -0300
commit69ebb83e13e514222b0ae4f8bd813a17679ed876 (patch)
tree62ccc7ee1e840d0a6cc01a9fc1c44a5f4e6f1edd /arch/mips/include/asm/errno.h
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/mips/include/asm/errno.h')
-rw-r--r--arch/mips/include/asm/errno.h2
1 files changed, 2 insertions, 0 deletions
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__