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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=2455; i=leitao@debian.org; h=from:subject:message-id; bh=JSAYCq4FrRtXIBW3O9fBpGpm6NgSi4FFUoqeHM4uUhU=; b=owEBbQKS/ZANAwAIATWjk5/8eHdtAcsmYgBqQ7qdbrCPdmwOUYMeBX462paxufYr9tGRerbCH OasygASlqmJAjMEAAEIAB0WIQSshTmm6PRnAspKQ5s1o5Of/Hh3bQUCakO6nQAKCRA1o5Of/Hh3 bVVQD/4gPbn24odiOayBajbGFGEEeV5MaoKhhXG2x1/3quOUZTcQSMVzShINOIi4z9ZAlEMRTUE 5ed/n2fywG3+FEe4q2dBRsc0/FYG3V9ELv8zNEZAX1EeSFWBFdDA2u7wgVfT+Un65/8XZ/k5KaV vpCH3gAO4HgKGe/uZevaJIgnb3L4eXaGu2e7kMQO8FVejK+v7knKyS3cvuLkPjhBGGHOZqJVZnV i7IHaqKqbE0UrR/8vO96QzE6DnjLHZnvLC4UnHNfWaze4VlfDxRyPTep3Ft86WddFeRbjKvvH09 WMJ0j2cKBS+39po3CGSvekV/7MNXHNM8Qv6wnrASznY9CyzS5n8I5g5zZxyz9Z/DVWwIUY00KhW 2a0FZ+pKA6b0gbIEwe++A0mcWP9dIEPyy6ZUWpoy7LdrfwtOqJ9bgGbxdtINVO71y8iypmC5WBV +QHCtoLaEV2LRAXfOmalZ4o7ACJRFW2oowTyLFpk6bIWxpu5bauNW1aop28+H6qmRCsMlN5rFV+ 5beF2+9R5OcrHUx/gvtOGO6whauiYOE9h45WUa32074n+BSjTdp4hd/nZTaRCoe8MR2QF4DNVZC ZYGxrEF34MtnDd1xCJ9T5of+4ojgSPUpMiOahFJC/EAgQNjC7/o9a3DfPebi1dSnSehwbs6LV0y Yyx0yYDZy/xtuSg== 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: 5CDA840005 X-Stat-Signature: m9suumgb5nuk3ompuba84d6u3fh8o7bm X-HE-Tag: 1782823610-995136 X-HE-Meta: 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 YJY6gxCD uQlpdJkTU9PmLpF6bAQSFw8xW6a2llaM+NMkIKHM7moCqHLNXns3fylmtuKCo8EFlScF8olO32DdDJx8qCEmkAqka7JHGZ8JSkaV4eqyPYBkM290yGE4RfSqWOJbjdBGoMLXzckSCmLCt2BRTscSiSwAfTJmvr0fqcNQOfqqRpz7j1BcGCaUgUgF5lM6PmNB1W3nbmfnblJnvGdYPaEUgznwfzT1QD4xvZIrwaVXpqomuKXk+VzyvzByBfO7t2Jk4JyPejq0oTW9wXDS1XNWJfAurVp4VRVp8Pr5SgycTZmVkZtOkgj7SuVIX7dO/5uFTtZeF3sm7Ui4LWRZkFlkf122kAJMg8zOV+KS5LEm6rIVDzpbdHBxqx08pWDBEJ6AoluxgXnlQCF/Q3bvw24B9yrAtgekO/eGD8ukZ0TcR/oCUGl8pgMAjh+pBczgqdmtmkmGFqUF6A2jJTb0= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: The previous patch teaches get_any_page() to return -ENOTRECOVERABLE for stable unhandlable kernel pages (PG_reserved, slab, page tables, large-kmalloc). memory_failure() still folds every negative return into MF_MSG_GET_HWPOISON, so callers that want to react to the unrecoverable cases (a panic option, smarter logging) cannot tell them apart from transient page-allocator races. Turn the post-call branch into a switch over the get_hwpoison_page() return code: map -ENOTRECOVERABLE to MF_MSG_KERNEL and any other negative return to MF_MSG_GET_HWPOISON. case 0 keeps the existing free-buddy / kernel-high-order handling and case 1 falls through to the rest of memory_failure() unchanged. The MF_MSG_KERNEL label and tracepoint string are kept as "reserved kernel page" to avoid breaking userspace tools that match on those literals; the enum value still adequately tags the failure even though it now also covers slab, page tables and large-kmalloc pages. Suggested-by: David Hildenbrand Acked-by: David Hildenbrand (Arm) Acked-by: Miaohe Lin Signed-off-by: Breno Leitao --- mm/memory-failure.c | 17 +++++++++++++++-- 1 file changed, 15 insertions(+), 2 deletions(-) diff --git a/mm/memory-failure.c b/mm/memory-failure.c index 087658484e242..5fc3de474014d 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -2436,7 +2436,8 @@ int memory_failure(unsigned long pfn, int flags) * that may make page_ref_freeze()/page_ref_unfreeze() mismatch. */ res = get_hwpoison_page(p, flags); - if (!res) { + switch (res) { + case 0: if (is_free_buddy_page(p)) { if (take_page_off_buddy(p)) { page_ref_inc(p); @@ -2455,7 +2456,19 @@ int memory_failure(unsigned long pfn, int flags) res = action_result(pfn, MF_MSG_KERNEL_HIGH_ORDER, MF_IGNORED); } goto unlock_mutex; - } else if (res < 0) { + case 1: + /* Got a refcount on a handlable page. */ + break; + case -ENOTRECOVERABLE: + /* + * Stable unhandlable kernel-owned page (PG_reserved, + * slab, page tables, large-kmalloc). + * No recovery possible. + */ + res = action_result(pfn, MF_MSG_KERNEL, MF_IGNORED); + goto unlock_mutex; + default: + /* Transient lifecycle race with the page allocator. */ res = action_result(pfn, MF_MSG_GET_HWPOISON, MF_IGNORED); goto unlock_mutex; } -- 2.53.0-Meta