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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id y8sm15163590pfe.36.2021.03.09.13.43.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 09 Mar 2021 13:43:09 -0800 (PST) From: Kees Cook To: Thomas Gleixner Cc: Kees Cook , Alexander Potapenko , Elena Reshetova , x86@kernel.org, Andy Lutomirski , Peter Zijlstra , Catalin Marinas , Will Deacon , Mark Rutland , Alexander Popov , Ard Biesheuvel , Jann Horn , kernel-hardening@lists.openwall.com, linux-hardening@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Vlastimil Babka , David Hildenbrand , Mike Rapoport , Andrew Morton , Jonathan Corbet , Randy Dunlap Subject: [PATCH v5 3/7] init_on_alloc: Unpessimize default-on builds Date: Tue, 9 Mar 2021 13:42:57 -0800 Message-Id: <20210309214301.678739-4-keescook@chromium.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210309214301.678739-1-keescook@chromium.org> References: <20210309214301.678739-1-keescook@chromium.org> MIME-Version: 1.0 X-Patch-Hashes: v=1; h=sha256; g=0180538bd89f892d9a7cb5912f57764dd4574e64; i=FGm2eJrFhO36W3pokRKQXJ/1lCJEdw+Xji0AZWdKldw=; m=vArMoxGjWi+hJ/sQRlVkEVurD6o0k4s1dF+QIrjNXSc=; p=UIEnT5JyleN0fGLkjBMkQSBdyQITBdVfP87yTFfx7Kg= X-Patch-Sig: m=pgp; i=keescook@chromium.org; s=0x0x8972F4DFDC6DC026; b=iQIzBAABCgAdFiEEpcP2jyKd1g9yPm4TiXL039xtwCYFAmBH6+QACgkQiXL039xtwCZhGQ//cU9 87sq54cQfs8uAKxVAHV77yHdW6J6AftBwhrqAq+1M0C1IoOLVi+Uvz1cWTM7C6G672FEhYPM8aZvd 31/s3taFnCDyvmBhh9HUBBsYUk7Hhwi+V7r5EvVHAxBw1jyUByiPVHV6FWRcSDFOZHv9iKXNEFC7O iKSWVZ4V6X0u98fHeVq2MA3000qbRbBtef8DMgWd5rq3d+1IJQKEWRi/ws2e3bW82oHj1a7+KPOv4 X1J5M9A/OStaOcbwJ76LyVjtjizbvJMYsUDfIwUkH2Ouj84CYuWxK5AflU8Wf8690EOKQ6XGAvCXA 2tcD81q96YPjYRgGy1QoC4cqyGHQf52FCkGDjrZd4LIHJjPLxc8C7OAemJ8ofvZNIZDwRF9u07y4D qUKVUYEjWSwsP03gVJB7kc6gYALIB5AX3qNNQkMAGKgiyrLXML5eBay0b9+G6DrlXQO2uEwQ6ocni JoXsEVBoz0zZRetbT2/TXK6Nqk9DV4p8bkO7R26Ut6wAEn8jZSHgyBk3GrJg+6d1pOzsj761vvjya NK/0w2VQYOsrjdciOEQR/Xd2ZGCaFPfQY41b5nEjmBC+YS8l0GSHFqG1ce4mPDlQeuNmYOgu8+k/B 1hTaHBXrEPHJbO69gYEpIn/T7M1Tb4pYIlHnvmvDlMkPoUrznzLJonVQIk5rqeX8= X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 393226000104 X-Stat-Signature: zkbfw3n6r67tpyqnj3dcmam6ptwo6saz Received-SPF: none (chromium.org>: No applicable sender policy available) receiver=imf09; identity=mailfrom; envelope-from=""; helo=mail-pg1-f170.google.com; client-ip=209.85.215.170 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1615326189-586718 Content-Transfer-Encoding: quoted-printable 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: Right now, the state of CONFIG_INIT_ON_ALLOC_DEFAULT_ON (and ...ON_FREE...) did not change the assembly ordering of the static branch tests. Use the new jump_label macro to check CONFIG settings to default to the "expected" state, unpessimizes the resulting assembly code. Reviewed-by: Alexander Potapenko Link: https://lore.kernel.org/lkml/CAG_fn=3DX0DVwqLaHJTO6Jw7TGcMSm77GKHin= rd0m_6y0SzWOrFA@mail.gmail.com/ Signed-off-by: Kees Cook --- include/linux/mm.h | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/include/linux/mm.h b/include/linux/mm.h index bf341a9bfe46..2ccd856ac0d1 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -2874,7 +2874,8 @@ static inline void kernel_unpoison_pages(struct pag= e *page, int numpages) { } DECLARE_STATIC_KEY_MAYBE(CONFIG_INIT_ON_ALLOC_DEFAULT_ON, init_on_alloc)= ; static inline bool want_init_on_alloc(gfp_t flags) { - if (static_branch_unlikely(&init_on_alloc)) + if (static_branch_maybe(CONFIG_INIT_ON_ALLOC_DEFAULT_ON, + &init_on_alloc)) return true; return flags & __GFP_ZERO; } @@ -2882,7 +2883,8 @@ static inline bool want_init_on_alloc(gfp_t flags) DECLARE_STATIC_KEY_MAYBE(CONFIG_INIT_ON_FREE_DEFAULT_ON, init_on_free); static inline bool want_init_on_free(void) { - return static_branch_unlikely(&init_on_free); + return static_branch_maybe(CONFIG_INIT_ON_FREE_DEFAULT_ON, + &init_on_free); } =20 extern bool _debug_pagealloc_enabled_early; --=20 2.25.1