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SubjectRe: [PATCH v2 7/9] mm, hwpoison: make __page_handle_poison returns int
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On 2022/6/24 7:51, Naoya Horiguchi wrote:
> From: Naoya Horiguchi <naoya.horiguchi@nec.com>
>
> __page_handle_poison() returns bool that shows whether
> take_page_off_buddy() has passed or not now. But we will want to
> distinguish another case of "dissolve has passed but taking off failed"
> by its return value. So change the type of the return value.
> No functional change.
>
> Signed-off-by: Naoya Horiguchi <naoya.horiguchi@nec.com>
> ---
> mm/memory-failure.c | 17 +++++++++++------
> 1 file changed, 11 insertions(+), 6 deletions(-)
>
> diff --git a/mm/memory-failure.c b/mm/memory-failure.c
> index ce045d0d6115..db85f644a1e3 100644
> --- a/mm/memory-failure.c
> +++ b/mm/memory-failure.c
> @@ -71,7 +71,13 @@ atomic_long_t num_poisoned_pages __read_mostly = ATOMIC_LONG_INIT(0);
>
> static bool hw_memory_failure __read_mostly = false;
>
> -static bool __page_handle_poison(struct page *page)
> +/*
> + * Return values:
> + * 1: the page is dissolved (if needed) and taken off from buddy,
> + * 0: the page is dissolved (if needed) and not taken off from buddy,
> + * < 0: failed to dissolve.
> + */
> +static int __page_handle_poison(struct page *page)
> {
> int ret;
>
> @@ -81,7 +87,7 @@ static bool __page_handle_poison(struct page *page)
> ret = take_page_off_buddy(page);
> zone_pcp_enable(page_zone(page));
>
> - return ret > 0;
> + return ret;
> }
>
> static bool page_handle_poison(struct page *page, bool hugepage_or_freepage, bool release)
> @@ -91,7 +97,7 @@ static bool page_handle_poison(struct page *page, bool hugepage_or_freepage, boo
> * Doing this check for free pages is also fine since dissolve_free_huge_page
> * returns 0 for non-hugetlb pages as well.
> */
> - if (!__page_handle_poison(page))
> + if (__page_handle_poison(page) <= 0)
> /*
> * We could fail to take off the target page from buddy
> * for example due to racy page allocation, but that's
> @@ -1048,7 +1054,7 @@ static int me_huge_page(struct page_state *ps, struct page *p)
> * subpages.
> */
> put_page(hpage);
> - if (__page_handle_poison(p)) {
> + if (__page_handle_poison(p) > 0) {
> page_ref_inc(p);
> res = MF_RECOVERED;
> }
> @@ -1698,8 +1704,7 @@ static int try_memory_failure_hugetlb(unsigned long pfn, int flags, int *hugetlb
> */
> if (res == 0) {
> unlock_page(head);
> - res = MF_FAILED;

It seems the previous discussion in [1] is missed. But that doesn't matter as pointed out by [1]. :)

Reviewed-by: Miaohe Lin <linmiaohe@huawei.com>

Thanks.

[1]: https://lkml.org/lkml/2022/6/8/10

> - if (__page_handle_poison(p)) {
> + if (__page_handle_poison(p) > 0) {
> page_ref_inc(p);
> res = MF_RECOVERED;
> }
>

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