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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=s2QW9XqvL8WjZfXefwNoMxA+bTjAbl8h4pWt6UPLNg0=; b=owEBbQKS/ZANAwAIATWjk5/8eHdtAcsmYgBqPpvEksQl12A/z+cCFlT5a56cpPKQDQtLbk7w0 4d+6v+0RMKJAjMEAAEIAB0WIQSshTmm6PRnAspKQ5s1o5Of/Hh3bQUCaj6bxAAKCRA1o5Of/Hh3 bVNiD/9SX076q5vGZiW2lgbbjfY+ggMk1c05Mw+nXFbi34vQfYN4L7EoW3mQlkCxzJ9hkpMH2dv DCNd6XPue6dY11w2akyjJlOzjYZnyHIDEVPyTiGGHF6emB653b1gp9+wySSJ2G1erY5nLomjTmS dUzE4zvj52+venVYza+suoJzQ0O1Nn9alK4mKE71ANHiTne6EFJ+Qh69GeWPqBF8zwn/YmwPetV WBjZRpkoyePndEOpCo+lzWHJum0L13HyCyvDXoesiU2KLtiBI+r2t4Jqp/OfBUapm0teEZMe530 8/KuNwiE8GfaRiWiwNuZfdSkAO7VkAvR9AUiTCozpRFTZm4UBwLQg5Cxyf5MmR7sqaXB7IEG7ND OB7+BvywXxhMTpVldg1nXylQKh53mqAmlF6AFssI89QI4ApwleJwYgzTxB2C30pua3BcHKpJXyE F3Y97D8F1hjl9DmQeXQpYF0mYhAQrsrcbk+o8Ceus4UGMtZAqJz9Nol2xf1SWFAmfgx6zVbRVC5 WWKsxE5WFuSqHgIyNkOQtKDcpalT/gdJFKfK2OzpiTAnr6eJmQpxtE/0ZiVLrShTQVV+Wl6vIfJ PBlxTTYC1chaBsTz4D311WVkG53ml3azBEXdBNBOb+mjX9CKwNVssQRt6t+jb7i7qpfnXorkoMT NF4BubXxohc5JcQ== X-Developer-Key: i=leitao@debian.org; a=openpgp; fpr=AC8539A6E8F46702CA4A439B35A3939FFC78776D X-Debian-User: leitao X-Stat-Signature: o17461rft4e5toikpg8izjtdeozriimn X-Rspam-User: X-Rspamd-Queue-Id: 8A2921C0005 X-Rspamd-Server: rspam02 X-HE-Tag: 1782488041-231161 X-HE-Meta: U2FsdGVkX1+c9IfVHb/BDC1zYHhz3IfO1ETGB2TUqv7qR67Cgp30t7Ekh3hxvI+wP3cZb60/Zm4j0lQ4OHwZcMIYWD5xouk7Hffcf7t6uWHAKrktnxIKfikULmFfxgg6U85GIknjtTwJ+tJl3mGp60AQWywl5z4BRafTl19JagcvKzqEtgWtiCpAkytlbqgc1gz4i3XUkMPuGaox1hM9E2xkM0d10wFisRxhiMZF87Ujb5/o90/vty7Qr+4OBKpjqDf8tQQg47qEalUZktuadDOHy3As3STQYxjkAMQD5quZeg/rq0JLBWGEn23+e+FycTz4+jEObpC+535j2z74ZMvfsahoYOg1RHp5Jz5nGQntpqZbZtFHbT6QE6ur6zq0mWtkbbXW/maOFeeG8U+APrwmHxXOc/bwY8QsNp5G6Py85LVAw77m1/TVXi8wTpEJrwqjyyEM3oNTwZe9lHXGKL6Xn1Zi6Yprx6gb4Efnsp6BwrBDZe2U4eAKqL7i6euOpCl9MFS361kpCAGshwxYMSBTvsnjSv/KFvEknCgjl5nqxPf68+/2LgJSsYOr9pj2poa9OG1wCYEjuwtdjkoA+d9K5I/OUP1vWAdF1MpZRDBKlIYQdUL5fBK/b78pyLrqM2DkIknUIdI9wfbLld4MzGublUldWXXWAxPKdMcbFRbWQkI2NmGWrZPMVDMgpC8HAO9gYXJBldI0/mNNMqhmUiLwfESaiAcYr8i6B+riatHS3h8FkIcJm4lFQ0NqibPQqbzzAKomqQ16dzzrzW3ZspI9C5kbsbEYoCNILV4Rm8i40/E/2zPTJmjVJ0r/nHvrYTG4hbbZ7BgLp1kI3TMOEw3UsPQP6VfYngvzd5T+faWfX+k/IdCXlGdwaMbkhCOpXSNfvSY4b3M0gvgwTQEe9P8D+Mp1wom9euklarHzwSidn/P5VI0YKzx5Q/j90SdCeSlDZNmzjM/CXxX7PGu 0N7ed7wb XJIzzt+zexVywdODzQl9Zz9B1PjU0biyNLktrYffT5bQPS7mleybjFNtz109kTJaZDeExYR/CGHmDlIZC/btcjG7/gIdw9/e857Frvob8OGsVaDMwEt/rq54RN2W5BYMAOqSgg8wp5Pp1ca833B149S9gLYN6skwKL4jKqKkhP/LKqtvCj6pE7woc9xppCuAGBz0j665Q19HPa2jZkGTMnfj0iSbxdoi6M8ep2SGBBIXuUPtHL48ONrses5TtaYErpA+6a2WqvbPL1K9rL1qJXanXK+BojEFgu4vXoJY3hOsOxMEZYeatErZfBeNwIfShLkLGo4pZEGRv/1L9rtA6RjTL5ia/Sbtw7eHovQm0G09Iq0IDbilwApmSqq6KqnoOcAqPkwT7aRXrzMqTX7Gz0E/yO91t9LFtoIYQCUaDAWefzSbv0CSce/Y6aePrKP4vLwAs93uwoNep4IA= 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 d08fbd0d8c39f..8e2aa2fafc14e 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -2434,7 +2434,8 @@ 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); @@ -2453,7 +2454,19 @@ 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