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Howlett" , lance.yang@linux.dev, Steven Rostedt , Masami Hiramatsu , Mathieu Desnoyers , "Liam R. Howlett" Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, Breno Leitao , linux-trace-kernel@vger.kernel.org, kernel-team@meta.com X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=3201; i=leitao@debian.org; h=from:subject:message-id; bh=QiA0KGoCN46shnI5qT5X0mAB2aGO1DAFqEcShnOA/HE=; b=owEBbQKS/ZANAwAIATWjk5/8eHdtAcsmYgBqPpvEdqLaNwFdB3QJkJ0QWv+5rYxWyoSuI/8FI uNGnwuyfZSJAjMEAAEIAB0WIQSshTmm6PRnAspKQ5s1o5Of/Hh3bQUCaj6bxAAKCRA1o5Of/Hh3 be34EACC6biyih5n4XzxL4jAdYPe7LRbOpn+PLp8N0q5SF0Szem1h7Q5xf8ZkPGOXfHPrD8NECb aHuPm6bOXyk3hARmfDc5FqympsSykr27EL0gIh9mAapzUkMc7Uvz3vIYgiK29Y45jd7s8iMR5CT /+q1U6yRCvmeN7TvH6viLGQCOVNppL75IO7EC56l2YXCZ/ry15N66oIzIGlNkVp0bz+Ft/PPx0v QtcZcm7+aZ0tuj8aG6kMkDiRMwo2u7cupmQpYU33zoFyBHIzIuaIEYVvzbvAhElfEhdA9USS7n6 JC7vX72JSiwuMTE6Ma4jq8JOfW/tzwkp3wS9VKxEk4mcAXhMTKG5hAi16mmkd/UPl9cNdjpRvja +JTN5n3+4AZU+35LlN9kuClJch8sjGsubx+9Xw44sCrL8tNrRkVklf4Yuie10RFEz27yi3QJfN+ lDHv9vTYX6qqKRTRmKNjoFPlaQUEJQL6DppgAdGVRY105aAFmoXIHr64xd0uohzmoV/KQ39I5TL /1HckYDK9+AenTlQYwFdU5lsa4i18IX6dd6gOUEoV6sfJ+zqtefVpPGQSMwz1kQZ3yCKqkT8gJ3 X1dG9WftHKDTwoedpGI4zKa/IhICTtInrIC30C8tENWZ4jguhco996+jgFRdz2koqjUp9gbP9Og ct/TtGrW2CxUG9w== X-Developer-Key: i=leitao@debian.org; a=openpgp; fpr=AC8539A6E8F46702CA4A439B35A3939FFC78776D X-Debian-User: leitao X-Rspam-User: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: D87B3140006 X-Stat-Signature: riizy8jtjwt3dz6q98wfm5daoaae1ez1 X-HE-Tag: 1782488038-594555 X-HE-Meta: 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 YxMJvHu5 Fhg9Yn3tJDsgppzHsHkZojvR4jgt8jV87D25rM9Q/BBwBv53CKcK9HAiDo7sRBbb2T5VubZ8REfCLbGCF2UhNuvXDCFiBgSd8oY0B0pVKwh7LxoWYX+JEZ/XK2UA3wS2wcUrMIpVhTqy47l5vdMUiZfU/aO9AqWI235o96Ae3KoO9KUzxrdOvFFoeewXq+fD6ZCT+AgW8nusYDgrYAuuHtPUByFNlfEdFFRJ2lxEGrtbQDFgELf2GAKTDWMOBMWL1flwjP74gAdXasw7dlheHiMWVuLdxF0LTlUCUuMrXfUwPQ89SCmHd1bLM6isdHA8iSsaZQVoy77oqG4sKNS2lmRCLNhNDoAm/HGhMszbs72whl2DbJXh63lPbzPC2s0+8Dr5JVpAYz/I8cRPLM/h4ejTCV2JQqWGl98wxV6SgTmK7MbsOpHSvD4Ycjrk+s4/z+G75fRzVbOv02WI= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: The first entry of error_states[], { reserved, reserved, MF_MSG_KERNEL, me_kernel }, is unreachable. identify_page_state() has two callers, and neither one can dispatch a PG_reserved page to me_kernel(): * memory_failure() reaches identify_page_state() only after get_hwpoison_page() returned 1. get_any_page() reaches that return only via __get_hwpoison_page(), which only takes a refcount when the page is HWPoisonHandlable(). HWPoisonHandlable() is an allowlist for LRU, free-buddy, and (for soft-offline) movable_ops pages -- PG_reserved pages do not satisfy any of these, so they fail with -EBUSY/-EIO long before identify_page_state() runs. * try_memory_failure_hugetlb() reaches identify_page_state() only via the MF_HUGETLB_IN_USED branch, where the page is necessarily a hugetlb folio. hugetlb folios don't carry PG_reserved at that point: hugetlb_folio_init_vmemmap() calls __folio_clear_reserved() during init, so the reserved entry would not match even if it were still present. me_kernel() never executes and the entry exists only to be matched against by code that cannot see it. Drop the entry, the me_kernel() helper, and the now-unused "reserved" macro. Leave the MF_MSG_KERNEL enum value in place: it remains part of the tracepoint and pr_err() string tables, and follow-on work to classify unrecoverable kernel pages can reuse it without churning the user-visible enum. No functional change. Suggested-by: David Hildenbrand Acked-by: David Hildenbrand (Arm) Reviewed-by: Lance Yang Acked-by: Miaohe Lin Signed-off-by: Breno Leitao --- mm/memory-failure.c | 14 -------------- 1 file changed, 14 deletions(-) diff --git a/mm/memory-failure.c b/mm/memory-failure.c index 51508a55c4055..f4d3e6e20e13f 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -980,17 +980,6 @@ static bool has_extra_refcount(struct page_state *ps, struct page *p, return false; } -/* - * Error hit kernel page. - * Do nothing, try to be lucky and not touch this instead. For a few cases we - * could be more sophisticated. - */ -static int me_kernel(struct page_state *ps, struct page *p) -{ - unlock_page(p); - return MF_IGNORED; -} - /* * Page in unknown state. Do nothing. * This is a catch-all in case we fail to make sense of the page state. @@ -1199,10 +1188,8 @@ static int me_huge_page(struct page_state *ps, struct page *p) #define mlock (1UL << PG_mlocked) #define lru (1UL << PG_lru) #define head (1UL << PG_head) -#define reserved (1UL << PG_reserved) static struct page_state error_states[] = { - { reserved, reserved, MF_MSG_KERNEL, me_kernel }, /* * free pages are specially detected outside this table: * PG_buddy pages only make a small fraction of all free pages. @@ -1234,7 +1221,6 @@ static struct page_state error_states[] = { #undef mlock #undef lru #undef head -#undef reserved static void update_per_node_mf_stats(unsigned long pfn, enum mf_result result) -- 2.53.0-Meta