From 69ebb83e13e514222b0ae4f8bd813a17679ed876 Mon Sep 17 00:00:00 2001 From: Huang Ying Date: Sun, 30 Jan 2011 11:15:48 +0800 Subject: 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 Cc: Andrew Morton Signed-off-by: Marcelo Tosatti Signed-off-by: Avi Kivity --- include/asm-generic/errno.h | 2 ++ 1 file changed, 2 insertions(+) (limited to 'include/asm-generic') diff --git a/include/asm-generic/errno.h b/include/asm-generic/errno.h index 28cc03b..a1331ce 100644 --- a/include/asm-generic/errno.h +++ b/include/asm-generic/errno.h @@ -108,4 +108,6 @@ #define ERFKILL 132 /* Operation not possible due to RF-kill */ +#define EHWPOISON 133 /* Memory page has hardware error */ + #endif -- cgit v1.1