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    SubjectRe: [PATCH 1/2] mm, Make __get_user_pages return -EHWPOISON for HWPOISON page optionally
    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@intel.com>
    > Cc: Andrew Morton<akpm@linux-foundation.org>
    >
    > +#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.

    --
    error compiling committee.c: too many arguments to function



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