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t=1789560232; bh=JO8zvszsozs4GkpHmyopZ7vErLCjHtSqmQPyVsRODfA=; h=From:Date:Subject:References:In-Reply-To:To:Cc; b=ml42hJBdAQr2V10Uh2pmfR0pjHqFBHJj6PovDXwc8vewjqQGxlDhnIsDti0bpmfWy qbcEynQD9O5UPH8qDpVSiyp7gR8W5fD10rfET67Dt1I/887weT9JoDXcW6ztZHOMEA ZnS1R2vaQy2Z28heQ7hU6pB0wdeEqqPFKA+36oh8IGv5aULa5t9GvmzW0BcXls50mf gHCOUdOBZkRK7++WyPFy2Gu0KrWQE2KlgRTn/hLip7vZ0s8+rwdaIHZa1np+GSIGud xPUIUvIaOq7dEUBXw/UbQtzvvTCmX64FMucBy98Id0Aj2ELEnBk1BjrIOtK/qJjvgq 32Fq2RNvXUMIg== From: "Mike Rapoport (Microsoft)" Date: Wed, 16 Sep 2026 15:03:18 +0300 Subject: [PATCH v3 11/13] s390/qdio_setup: Use kmalloc() for the storage list MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260916-s390-cio-ready-v3-11-39e4894637d6@kernel.org> References: <20260916-s390-cio-ready-v3-0-39e4894637d6@kernel.org> In-Reply-To: <20260916-s390-cio-ready-v3-0-39e4894637d6@kernel.org> To: Heiko Carstens , Vasily Gorbik , Alexander Gordeev Cc: Christian Borntraeger , Mike Rapoport , Peter Oberparleiter , Sven Schnelle , Vineeth Vijayan , Vlastimil Babka , linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org X-Mailer: b4 0.17-dev X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: F1614C001C X-Rspam-User: X-Stat-Signature: s8sbfsfcyhnty6hmnt55m8osbjzjabx5 X-HE-Tag: 1789560232-680343 X-HE-Meta: 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 xMqkg4Bf lcXE9Q1PhMEKebG1mKe/2XvZZur27mdUqRuI3JoigMKsWj44jof5p7PE4wZF2ITzvyTZzkyy7zdhQdBIDPyezSSXPmqLqrTVmqZEwRDPP/nNzvimVMgXHdVM0crBrYDNLSF7hfRLxwXUc37y0z9QFKR+Mjdex74Z2wA1kUh5pkzX93SIWE+ZyLK73A3r2Mdze1EOjF9x2U1ZMkPb+WMtEEsXJVmyZCo7mRq/mT+3To3BbaalMrCHi6FVPnv9+OoQGqeUCB7Lkwu1VLx04Ei4bWQewAevpnPLmI7PZouj5FO62ZbpCvM1PfRo6k1E9KLeH+ol3 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: __qdio_allocate_qs() allocates the storage list information block of a queue. This memory can be allocated with kmalloc() as there's nothing special about it to go directly to the page allocator. kmalloc() provides a better API that does not require ugly casts and kfree() does not need to know the size of the freed object. Performance difference between kmalloc() and __get_free_pages() is not measurable as both allocators take an object/page from a per-CPU list for fast path allocations. For the slow path the performance is anyway determined by the amount of reclaim involved rather than by what allocator is used. Replace use of __get_free_page() with kmalloc() and free_page() with kfree(). Link: https://lore.kernel.org/all/635405e4-9423-4a25-a6e7-e03c8ea0bcbe@redhat.com Assisted-by: copilot:claude-opus Signed-off-by: Mike Rapoport (Microsoft) --- drivers/s390/cio/qdio_setup.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/s390/cio/qdio_setup.c b/drivers/s390/cio/qdio_setup.c index b6f2ff202fe64..d8e9c0872d15d 100644 --- a/drivers/s390/cio/qdio_setup.c +++ b/drivers/s390/cio/qdio_setup.c @@ -83,7 +83,7 @@ static void __qdio_free_queues(struct qdio_q **queues, unsigned int count) for (i = 0; i < count; i++) { q = queues[i]; - free_page((unsigned long)q->sl_page); + kfree(q->sl_page); kmem_cache_free(qdio_q_cache, q); } } @@ -109,7 +109,7 @@ static int __qdio_allocate_qs(struct qdio_q **irq_ptr_qs, int nr_queues) return -ENOMEM; } - q->sl_page = (void *)__get_free_page(GFP_KERNEL); + q->sl_page = kmalloc(PAGE_SIZE, GFP_KERNEL); if (!q->sl_page) { kmem_cache_free(qdio_q_cache, q); __qdio_free_queues(irq_ptr_qs, i); -- 2.53.0