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[88.18.140.237]) by smtp.gmail.com with ESMTPSA id o5sm4650076wrw.76.2020.10.21.10.38.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 21 Oct 2020 10:38:14 -0700 (PDT) From: =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= To: Richard Henderson , qemu-devel@nongnu.org Subject: [PATCH v5 2/2] util/oslib: Assert qemu_try_memalign() alignment is a power of 2 Date: Wed, 21 Oct 2020 19:38:03 +0200 Message-Id: <20201021173803.2619054-3-philmd@redhat.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20201021173803.2619054-1-philmd@redhat.com> References: <20201021173803.2619054-1-philmd@redhat.com> MIME-Version: 1.0 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=philmd@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=63.128.21.124; envelope-from=philmd@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/10/20 22:12:28 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Paolo Bonzini , =?utf-8?q?Philippe_Mathieu-Daud?= =?utf-8?q?=C3=A9?= , Stefan Weil Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" qemu_try_memalign() expects a power of 2 alignment: - posix_memalign(3): The address of the allocated memory will be a multiple of alignment, which must be a power of two and a multiple of sizeof(void *). - _aligned_malloc() The alignment value, which must be an integer power of 2. Signed-off-by: Philippe Mathieu-Daudé --- util/oslib-posix.c | 2 ++ util/oslib-win32.c | 1 + 2 files changed, 3 insertions(+) diff --git a/util/oslib-posix.c b/util/oslib-posix.c index f15234b5c03..3e022d7206b 100644 --- a/util/oslib-posix.c +++ b/util/oslib-posix.c @@ -200,6 +200,8 @@ void *qemu_try_memalign(size_t alignment, size_t size) if (alignment < sizeof(void*)) { alignment = sizeof(void*); + } else { + g_assert(is_power_of_2(alignment)); } #if defined(CONFIG_POSIX_MEMALIGN) diff --git a/util/oslib-win32.c b/util/oslib-win32.c index 29dd05d59d7..72e4ee910ce 100644 --- a/util/oslib-win32.c +++ b/util/oslib-win32.c @@ -58,6 +58,7 @@ void *qemu_try_memalign(size_t alignment, size_t size) void *ptr; g_assert(size != 0); + g_assert(is_power_of_2(alignment)); ptr = _aligned_malloc(alignment, size); trace_qemu_memalign(alignment, size, ptr); return ptr;