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Mon, 15 Sep 2025 06:40:50 -0700 (PDT) From: "Uladzislau Rezki (Sony)" To: linux-mm@kvack.org, Andrew Morton Cc: Michal Hocko , Baoquan He , LKML , Uladzislau Rezki Subject: [PATCH v2 09/10] mm: Skip might_alloc() warnings when PF_MEMALLOC is set Date: Mon, 15 Sep 2025 15:40:39 +0200 Message-ID: <20250915134041.151462-10-urezki@gmail.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20250915134041.151462-1-urezki@gmail.com> References: <20250915134041.151462-1-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. Signed-off-by: Uladzislau Rezki (Sony) Acked-by: Michal Hocko --- include/linux/sched/mm.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/include/linux/sched/mm.h b/include/linux/sched/mm.h index 2201da0afecc..dc2d3cab32ef 100644 --- a/include/linux/sched/mm.h +++ b/include/linux/sched/mm.h @@ -318,7 +318,8 @@ static inline void might_alloc(gfp_t gfp_mask) fs_reclaim_acquire(gfp_mask); fs_reclaim_release(gfp_mask); =20 - might_sleep_if(gfpflags_allow_blocking(gfp_mask)); + might_sleep_if(gfpflags_allow_blocking(gfp_mask) && + !(current->flags & PF_MEMALLOC)); } =20 /** --=20 2.47.3