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Tue, 07 Oct 2025 05:20:47 -0700 (PDT) From: "Uladzislau Rezki (Sony)" To: linux-mm@kvack.org, Andrew Morton Cc: Michal Hocko , Baoquan He , LKML , Uladzislau Rezki , Michal Hocko Subject: [PATCH v4 08/10] mm: Skip might_alloc() warnings when PF_MEMALLOC is set Date: Tue, 7 Oct 2025 14:20:33 +0200 Message-ID: <20251007122035.56347-9-urezki@gmail.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20251007122035.56347-1-urezki@gmail.com> References: <20251007122035.56347-1-urezki@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" might_alloc() catches invalid blocking allocations in contexts where sleeping is not allowed. However when PF_MEMALLOC is set, the page allocator already skips reclaim and other blocking paths. In such cases, a blocking gfp_mask does not actually lead to blocking, so triggering might_alloc() splats is misleading. Adjust might_alloc() to skip warnings when the current task has PF_MEMALLOC set, matching the allocator's actual blocking behaviour. Reviewed-by: Baoquan He Acked-by: Michal Hocko Signed-off-by: Uladzislau Rezki (Sony) --- include/linux/sched/mm.h | 3 +++ 1 file changed, 3 insertions(+) diff --git a/include/linux/sched/mm.h b/include/linux/sched/mm.h index 0232d983b715..a74582aed747 100644 --- a/include/linux/sched/mm.h +++ b/include/linux/sched/mm.h @@ -318,6 +318,9 @@ static inline void might_alloc(gfp_t gfp_mask) fs_reclaim_acquire(gfp_mask); fs_reclaim_release(gfp_mask); =20 + if (current->flags & PF_MEMALLOC) + return; + might_sleep_if(gfpflags_allow_blocking(gfp_mask)); } =20 --=20 2.47.3