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Fri, 30 Nov 2018 11:47:42 +0000 Received: from VI1PR0802MB2528.eurprd08.prod.outlook.com ([fe80::3d5c:5229:b634:b1ac]) by VI1PR0802MB2528.eurprd08.prod.outlook.com ([fe80::3d5c:5229:b634:b1ac%11]) with mapi id 15.20.1382.020; Fri, 30 Nov 2018 11:47:42 +0000 From: Dave Rodgman To: "linux-kernel@vger.kernel.org" , "akpm@linux-foundation.org" CC: "herbert@gondor.apana.org.au" , "davem@davemloft.net" , Matt Sealey , "nitingupta910@gmail.com" , "markus@oberhumer.com" , "minchan@kernel.org" , "sergey.senozhatsky.work@gmail.com" , "sonnyrao@google.com" , "gregkh@linuxfoundation.org" , nd Subject: [PATCH 4/8] lib/lzo: 64-bit CTZ on arm64 Thread-Topic: [PATCH 4/8] lib/lzo: 64-bit CTZ on arm64 Thread-Index: AQHUiKKAw7LQXoAT+EebhxoBnJQmew== Date: Fri, 30 Nov 2018 11:47:42 +0000 Message-ID: <20181130114715.27523-5-dave.rodgman@arm.com> References: <20181130114715.27523-1-dave.rodgman@arm.com> In-Reply-To: <20181130114715.27523-1-dave.rodgman@arm.com> Accept-Language: en-GB, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-mailer: git-send-email 2.17.1 x-originating-ip: [217.140.106.53] x-clientproxiedby: CWXP265CA0058.GBRP265.PROD.OUTLOOK.COM (2603:10a6:400:2c::22) To VI1PR0802MB2528.eurprd08.prod.outlook.com (2603:10a6:800:b0::14) authentication-results: spf=none (sender IP is ) smtp.mailfrom=dave.rodgman@arm.com; 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received-spf: None (protection.outlook.com: arm.com does not designate permitted sender hosts) x-microsoft-antispam-message-info: H6+oawDPBJ+1ghEhtBhr3W/N0Yy7ll2NZV4UnXBx6JBpwRtO3i1fL8O4luqMXS0aC0adPpHUo2d9q20WgpVcR0sT1rZB0UCaVYAd2Ndf/rjn7H3DGBhev1NMnJ4JMVt+Ee+TQqeJ+kV2eLPts/FC1y2jXDTqvNMWQwGxtOjvmuQtNsfprxpS8kArM5ztjRl+Ol26cyxTrZWedazI8EhmNEg+5SbF7OUTv11SBH+7Z0RNrWN3xRc0DsRX3qVDBn2QnsyQujr4WQv4nEPHNhRZQEeeAi3KeSSukjhN0i7DdmT/pOljNP8UHJNbWWAZmUv3mv59K2efyViWzHtW6wBx09mVsMV5n6AuWLPBXBxvmJQ= spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-Network-Message-Id: 01bc7c5e-5cd1-4b4a-83ef-08d656b9a2eb X-MS-Exchange-CrossTenant-originalarrivaltime: 30 Nov 2018 11:47:42.4198 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI1PR0802MB2623 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Matt Sealey LZO leaves some performance on the table by not realising that arm64 can optimize count-trailing-zeros bit operations. Add CONFIG_ARM64 to the checked definitions alongside CONFIG_X86_64 to enable the use of rbit/clz instructions on full 64-bit quantities. Link: http://lkml.kernel.org/r/20181127161913.23863-5-dave.rodgman@arm.com Signed-off-by: Matt Sealey Signed-off-by: Dave Rodgman Cc: David S. Miller Cc: Greg Kroah-Hartman Cc: Herbert Xu Cc: Markus F.X.J. Oberhumer Cc: Minchan Kim Cc: Nitin Gupta Cc: Richard Purdie Cc: Sergey Senozhatsky Cc: Sonny Rao Signed-off-by: Andrew Morton Signed-off-by: Stephen Rothwell --- lib/lzo/lzodefs.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/lib/lzo/lzodefs.h b/lib/lzo/lzodefs.h index c0193f726db0..c8965dc181df 100644 --- a/lib/lzo/lzodefs.h +++ b/lib/lzo/lzodefs.h @@ -28,7 +28,7 @@ =20 #if defined(__BIG_ENDIAN) && defined(__LITTLE_ENDIAN) #error "conflicting endian definitions" -#elif defined(CONFIG_X86_64) +#elif defined(CONFIG_X86_64) || defined(CONFIG_ARM64) #define LZO_USE_CTZ64 1 #define LZO_USE_CTZ32 1 #elif defined(CONFIG_X86) || defined(CONFIG_PPC) --=20 2.17.1