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Shutemov" To: Andrew Morton , Mel Gorman , Vlastimil Babka , David Hildenbrand Cc: linux-mm@kvack.org, linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, "Kirill A. Shutemov" , Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Mark Rutland , Alexander Shishkin , Jiri Olsa , Namhyung Kim , Ian Rogers , Adrian Hunter Subject: [PATCH 06/10] perf/core: Fix MAX_ORDER usage in rb_alloc_aux_page() Date: Wed, 15 Mar 2023 14:31:29 +0300 Message-Id: <20230315113133.11326-7-kirill.shutemov@linux.intel.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230315113133.11326-1-kirill.shutemov@linux.intel.com> References: <20230315113133.11326-1-kirill.shutemov@linux.intel.com> MIME-Version: 1.0 X-Rspam-User: X-Rspamd-Server: rspam03 X-Stat-Signature: 6afoaz638jpzphpu71gks8xd5eeu1gkq X-Rspamd-Queue-Id: 0BD2E40022 X-HE-Tag: 1678879909-619534 X-HE-Meta: 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 tiYrKfC3 OFOQYmznojWb7oXjOoR3eRgT6yJesGIPsqG/DqCHgw6WlaQnoCGdzxD7EhEROZ4YJSIgfJoClotMKCPhnj4OtmT7ETkcT+OuOf9XDNEWza1kmYg50+dhCjJXBvcqwZKbezRy0l5B+yRCutxZcehR8J7EBrfLAqpGjofu0RJ5ebt3Ph/B5iI2N/RBdNnIm78XVl88sJWC1mqo5oUeFSP2J3fRQR0PwqZRAPpOeRmsehcPiKkFyDdkii8QSNS9TqSccVfo2z2gmdfetemHnSY8e9QX6iQXZ7f2OlPhW9I1zMx/a8NNK5Apt+9gsdJ9D5xUAlPOqfBPjOrXMW/93zI7KJ0n61itu0HKWc9ydWuHWiEly6FQJ4sXmC6FmTOS8eDHLHtAIdY5F+pCxDqZPlfLqb/31SJ8vVE2GOV+4jaeweVBkRNA= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: MAX_ORDER is not inclusive: the maximum allocation order buddy allocator can deliver is MAX_ORDER-1. Fix MAX_ORDER usage in rb_alloc_aux_page(). Signed-off-by: Kirill A. Shutemov Cc: Peter Zijlstra Cc: Ingo Molnar Cc: Arnaldo Carvalho de Melo Cc: Mark Rutland Cc: Alexander Shishkin Cc: Jiri Olsa Cc: Namhyung Kim Cc: Ian Rogers Cc: Adrian Hunter Acked-by: Vlastimil Babka --- kernel/events/ring_buffer.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/kernel/events/ring_buffer.c b/kernel/events/ring_buffer.c index 273a0fe7910a..d6bbdb7830b2 100644 --- a/kernel/events/ring_buffer.c +++ b/kernel/events/ring_buffer.c @@ -609,8 +609,8 @@ static struct page *rb_alloc_aux_page(int node, int order) { struct page *page; - if (order > MAX_ORDER) - order = MAX_ORDER; + if (order >= MAX_ORDER) + order = MAX_ORDER - 1; do { page = alloc_pages_node(node, PERF_AUX_GFP, order);