From c8bd84f73fd6215d5b8d0b3cfc914a3671b16d1c Mon Sep 17 00:00:00 2001 From: zhenwei pi Date: Thu, 12 May 2022 20:23:09 -0700 Subject: [PATCH] mm/memory-failure.c: simplify num_poisoned_pages_dec Don't decrease the number of poisoned pages in page_alloc.c, let the memory-failure.c do inc/dec poisoned pages only. Also simplify unpoison_memory(), only decrease the number of poisoned pages when: - TestClearPageHWPoison() succeed - put_page_back_buddy succeed After decreasing, print necessary log. Finally, remove clear_page_hwpoison() and unpoison_taken_off_page(). Link: https://lkml.kernel.org/r/20220509105641.491313-3-pizhenwei@bytedance.com Signed-off-by: zhenwei pi Acked-by: Naoya Horiguchi Signed-off-by: Andrew Morton --- mm/memory-failure.c | 37 +++++++++---------------------------- mm/page_alloc.c | 1 - 2 files changed, 9 insertions(+), 29 deletions(-) diff --git a/mm/memory-failure.c b/mm/memory-failure.c index e7a13e9..837975a 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -2092,28 +2092,6 @@ core_initcall(memory_failure_init); pr_info(fmt, pfn); \ }) -static inline int clear_page_hwpoison(struct ratelimit_state *rs, struct page *p) -{ - if (TestClearPageHWPoison(p)) { - unpoison_pr_info("Unpoison: Software-unpoisoned page %#lx\n", - page_to_pfn(p), rs); - num_poisoned_pages_dec(); - return 1; - } - return 0; -} - -static inline int unpoison_taken_off_page(struct ratelimit_state *rs, - struct page *p) -{ - if (put_page_back_buddy(p)) { - unpoison_pr_info("Unpoison: Software-unpoisoned page %#lx\n", - page_to_pfn(p), rs); - return 0; - } - return -EBUSY; -} - /** * unpoison_memory - Unpoison a previously poisoned page * @pfn: Page number of the to be unpoisoned page @@ -2131,6 +2109,7 @@ int unpoison_memory(unsigned long pfn) struct page *page; struct page *p; int ret = -EBUSY; + int freeit = 0; static DEFINE_RATELIMIT_STATE(unpoison_rs, DEFAULT_RATELIMIT_INTERVAL, DEFAULT_RATELIMIT_BURST); @@ -2171,18 +2150,15 @@ int unpoison_memory(unsigned long pfn) ret = get_hwpoison_page(p, MF_UNPOISON); if (!ret) { - if (clear_page_hwpoison(&unpoison_rs, page)) - ret = 0; - else - ret = -EBUSY; + ret = TestClearPageHWPoison(page) ? 0 : -EBUSY; } else if (ret < 0) { if (ret == -EHWPOISON) { - ret = unpoison_taken_off_page(&unpoison_rs, p); + ret = put_page_back_buddy(p) ? 0 : -EBUSY; } else unpoison_pr_info("Unpoison: failed to grab page %#lx\n", pfn, &unpoison_rs); } else { - int freeit = clear_page_hwpoison(&unpoison_rs, p); + freeit = !!TestClearPageHWPoison(p); put_page(page); if (freeit && !(pfn == my_zero_pfn(0) && page_count(p) == 1)) { @@ -2193,6 +2169,11 @@ int unpoison_memory(unsigned long pfn) unlock_mutex: mutex_unlock(&mf_mutex); + if (!ret || freeit) { + num_poisoned_pages_dec(); + unpoison_pr_info("Unpoison: Software-unpoisoned page %#lx\n", + page_to_pfn(p), &unpoison_rs); + } return ret; } EXPORT_SYMBOL(unpoison_memory); diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 732e01e..a4a8fbb 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -9497,7 +9497,6 @@ bool put_page_back_buddy(struct page *page) ClearPageHWPoisonTakenOff(page); __free_one_page(page, pfn, zone, 0, migratetype, FPI_NONE); if (TestClearPageHWPoison(page)) { - num_poisoned_pages_dec(); ret = true; } } -- 2.7.4