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Tue, 13 Aug 2019 18:56:40 +0000 From: Steve Capper To: Will Deacon Subject: Re: [PATCH 6/8] arm64: memory: Implement __tag_set() as common function Thread-Topic: [PATCH 6/8] arm64: memory: Implement __tag_set() as common function Thread-Index: AQHVUfjVT0kr0ZC64UWZ3YpKCNXfm6b5bboA Date: Tue, 13 Aug 2019 18:56:40 +0000 Message-ID: <20190813185638.GG19835@capper-ampere.manchester.arm.com> References: <20190813170149.26037-1-will@kernel.org> <20190813170149.26037-7-will@kernel.org> In-Reply-To: <20190813170149.26037-7-will@kernel.org> Accept-Language: en-GB, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Mutt/1.10.1 (2018-07-13) x-originating-ip: [217.140.106.32] x-clientproxiedby: LO2P265CA0268.GBRP265.PROD.OUTLOOK.COM (2603:10a6:600:a1::16) To DB8PR08MB4105.eurprd08.prod.outlook.com (2603:10a6:10:b0::12) Authentication-Results-Original: spf=none (sender IP is ) smtp.mailfrom=Steve.Capper@arm.com; x-ms-exchange-messagesentrepresentingtype: 1 x-ms-publictraffictype: Email X-MS-Office365-Filtering-Correlation-Id: 56519841-5d6c-4d52-e538-08d7201fffb6 X-MS-Office365-Filtering-HT: Tenant X-Microsoft-Antispam-Untrusted: BCL:0; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Tue, Aug 13, 2019 at 06:01:47PM +0100, Will Deacon wrote: > There's no need for __tag_set() to be a complicated macro when > CONFIG_KASAN_SW_TAGS=y and a simple static inline otherwise. Rewrite > the thing as a common static inline function. > > Signed-off-by: Will Deacon Reviewed-by: Steve Capper > --- > arch/arm64/include/asm/memory.h | 14 +++++++------- > 1 file changed, 7 insertions(+), 7 deletions(-) > > diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memory.h > index 5552c8cba1e2..e902132b808c 100644 > --- a/arch/arm64/include/asm/memory.h > +++ b/arch/arm64/include/asm/memory.h > @@ -218,20 +218,20 @@ static inline unsigned long kaslr_offset(void) > > #ifdef CONFIG_KASAN_SW_TAGS > #define __tag_shifted(tag) ((u64)(tag) << 56) > -#define __tag_set(addr, tag) (__typeof__(addr))( \ > - ((u64)(addr) & ~__tag_shifted(0xff)) | __tag_shifted(tag)) > #define __tag_reset(addr) untagged_addr(addr) > #define __tag_get(addr) (__u8)((u64)(addr) >> 56) > #else > -static inline const void *__tag_set(const void *addr, u8 tag) > -{ > - return addr; > -} > - > +#define __tag_shifted(tag) 0UL > #define __tag_reset(addr) (addr) > #define __tag_get(addr) 0 > #endif > > +static inline const void *__tag_set(const void *addr, u8 tag) > +{ > + u64 __addr = (u64)addr & ~__tag_shifted(0xff); > + return (const void *)(__addr | __tag_shifted(tag)); > +} > + > /* > * Physical vs virtual RAM address space conversion. These are > * private definitions which should NOT be used outside memory.h > -- > 2.11.0 > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel