On 01/13/2011 10:42 AM, Huang Ying wrote:
Make __get_user_pages return -EHWPOISON for HWPOISON page only if FOLL_HWPOISON is specified. With this patch, the interested callers can distinguish HWPOISON page from general FAULT page, while other callers will still get -EFAULT for pages, so the user space interface need not to be changed. get_user_pages_hwpoison is added as a variant of get_user_pages that can return -EHWPOISON for HWPOISON page. 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@xxxxxxxxx> Cc: Andrew Morton<akpm@xxxxxxxxxxxxxxxxxxxx> +#ifdef CONFIG_MEMORY_FAILURE +int get_user_pages_hwpoison(struct task_struct *tsk, struct mm_struct *mm, + unsigned long start, int nr_pages, int write, + int force, struct page **pages, + struct vm_area_struct **vmas); +#else
Since we'd also like to add get_user_pages_noio(), perhaps adding a flags field to get_user_pages() is better.
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