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Fri, 18 Oct 2019 02:43:36 -0700 (PDT) Date: Fri, 18 Oct 2019 11:42:46 +0200 In-Reply-To: <20191018094304.37056-1-glider@google.com> Message-Id: <20191018094304.37056-9-glider@google.com> Mime-Version: 1.0 References: <20191018094304.37056-1-glider@google.com> X-Mailer: git-send-email 2.23.0.866.gb869b98d4c-goog Subject: [PATCH RFC v1 08/26] kmsan: gfp: introduce __GFP_NO_KMSAN_SHADOW From: glider@google.com To: Alexander Potapenko Cc: Vegard Nossum , Andrew Morton , Dmitry Vyukov , linux-mm@kvack.org 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: This flag is to be used by KMSAN runtime to mark that newly created memory pages don't need KMSAN metadata backing them. Signed-off-by: Alexander Potapenko To: Alexander Potapenko Cc: Vegard Nossum Cc: Andrew Morton Cc: Dmitry Vyukov Cc: linux-mm@kvack.org --- We can't decide what to do here: - do we need to conditionally define ___GFP_NO_KMSAN_SHADOW depending on CONFIG_KMSAN like LOCKDEP does? - if KMSAN is defined, and LOCKDEP is not, do we want to "compactify" the GFP bits? Change-Id: If5d0352fd5711ad103328e2c185eb885e826423a --- include/linux/gfp.h | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/include/linux/gfp.h b/include/linux/gfp.h index fb07b503dc45..b4e7963cd94b 100644 --- a/include/linux/gfp.h +++ b/include/linux/gfp.h @@ -44,6 +44,7 @@ struct vm_area_struct; #else #define ___GFP_NOLOCKDEP 0 #endif +#define ___GFP_NO_KMSAN_SHADOW 0x1000000u /* If the above are modified, __GFP_BITS_SHIFT may need updating */ /* @@ -212,12 +213,13 @@ struct vm_area_struct; #define __GFP_NOWARN ((__force gfp_t)___GFP_NOWARN) #define __GFP_COMP ((__force gfp_t)___GFP_COMP) #define __GFP_ZERO ((__force gfp_t)___GFP_ZERO) +#define __GFP_NO_KMSAN_SHADOW ((__force gfp_t)___GFP_NO_KMSAN_SHADOW) /* Disable lockdep for GFP context tracking */ #define __GFP_NOLOCKDEP ((__force gfp_t)___GFP_NOLOCKDEP) /* Room for N __GFP_FOO bits */ -#define __GFP_BITS_SHIFT (23 + IS_ENABLED(CONFIG_LOCKDEP)) +#define __GFP_BITS_SHIFT (25) #define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1)) /**