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Sat, 2 Feb 2019 01:43:16 +0000 From: Paul Burton To: "linux-mips@vger.kernel.org" CC: Paul Burton Subject: [PATCH 01/14] MIPS: mm: Define activate_mm() using switch_mm() Thread-Topic: [PATCH 01/14] MIPS: mm: Define activate_mm() using switch_mm() Thread-Index: AQHUupiqp1Sra5g7vEKmmfY4jNBCDA== Date: Sat, 2 Feb 2019 01:43:15 +0000 Message-ID: <20190202014242.30680-2-paul.burton@mips.com> References: <20190202014242.30680-1-paul.burton@mips.com> In-Reply-To: <20190202014242.30680-1-paul.burton@mips.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-clientproxiedby: BYAPR01CA0021.prod.exchangelabs.com (2603:10b6:a02:80::34) To MWHPR2201MB1277.namprd22.prod.outlook.com (2603:10b6:301:24::17) authentication-results: spf=none (sender IP is ) smtp.mailfrom=pburton@wavecomp.com; x-ms-exchange-messagesentrepresentingtype: 1 x-mailer: git-send-email 2.20.1 x-originating-ip: [67.207.99.198] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1;MWHPR2201MB1439;6:3JnP0V6y+EyVK4Rqjvzyz96dVN1H7+k/gMuZoymRPmmk7OkbX26MTIPC85ZMiSWmhH4FRu3gFafRjWW8+VKdyqBNbQw3D/rtxifimQu+Vk9VK8NXblwmK+BezIUjzueIOEkdRpbmO3pZzkEh19mkawr0KeZfNgFxV1Nzq7l8y3utmEgMArc8OsYPFfCmRcyBpL0isRjpatNGjoJ46ckv7NLRH6MhEin66F2Ucxrd6of6vMih9qTY2jX+dCgx7ep5qaZWW3vJVMPmN7C5Br+WdNGnRVQ43jNCItOlnAXK2UznlmlCVaOOHMcKM60zHmp39Ho/mc6XKhmjfUt7CBWuMUOt+0JC4g+iAWKTRunM2Wojw+wQXy7AhObWkpfGwsk2drNq4Gq0NkMc8JV3SgUGnqXBy50c+ihBwV1M1md4lrptt0LmUnry4tJKcDFSoYlS2PvwGlyuu3PFFgzoiQC9Rg==;5:eaGCPgVdKAXr/2OkaNe65S4BlYpCAPeEouWTbIJqy1Z5yNfddPjQUlIQe7y/2eHzYXku2vhgsaoyOGDg+BLL0BOA0CSrtVP/K40tF8QS56CPTlpo/JT/UDlSXiZjs9adxqgG1CAKHhXjs80rJq5/OwkCUty0h+oQejf3eAR4Q6sdkfh5obi9zcLySJ6AfMGZaJVes13bPrlXMzXtjRNaWg==;7:gNkG+5GVn+LWRbldK6TXrNnBVOslpwKrvxHxuSL0yCI3GNIrk2pmwUvGkZTwtKxSeTiJe0SAoy27UhzOTj9l6WhEtn27CRKV6t4uG1zLzF0LcmQCu24+zzqQPm4BZ6TJIV4xxNJzij1U+qCKDm6dBQ== x-ms-office365-filtering-correlation-id: af5bc491-d48e-4ec0-2d52-08d688afccc3 x-microsoft-antispam: BCL:0;PCL:0;RULEID:(2390118)(7020095)(4652040)(8989299)(4534185)(4627221)(201703031133081)(201702281549075)(8990200)(5600110)(711020)(4605077)(2017052603328)(7153060)(7193020);SRVR:MWHPR2201MB1439; 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charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: mips.com X-MS-Exchange-CrossTenant-Network-Message-Id: af5bc491-d48e-4ec0-2d52-08d688afccc3 X-MS-Exchange-CrossTenant-originalarrivaltime: 02 Feb 2019 01:43:15.4440 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 463607d3-1db3-40a0-8a29-970c56230104 X-MS-Exchange-Transport-CrossTenantHeadersStamped: MWHPR2201MB1439 Sender: linux-mips-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org MIPS has separate definitions of activate_mm() & switch_mm() which are identical apart from switch_mm() checking that the ASID is valid before acquiring a new one. We know that when activate_mm() is called cpu_context(X, mm) will be zero, and this will never be considered a valid ASID because we never allow the ASID version number to be zero, instead beginning with version 1 using asid_first_version(). Therefore switch_mm() will always allocate a new ASID when called for a new task, meaning that it will behave identically to activate_mm(). Take advantage of this to remove the duplication & define activate_mm() using switch_mm() just like many other architectures do. Signed-off-by: Paul Burton --- arch/mips/include/asm/mmu_context.h | 28 +--------------------------- 1 file changed, 1 insertion(+), 27 deletions(-) diff --git a/arch/mips/include/asm/mmu_context.h b/arch/mips/include/asm/mm= u_context.h index a589585be21b..6731fa5ec4b9 100644 --- a/arch/mips/include/asm/mmu_context.h +++ b/arch/mips/include/asm/mmu_context.h @@ -166,35 +166,9 @@ static inline void destroy_context(struct mm_struct *m= m) dsemul_mm_cleanup(mm); } =20 +#define activate_mm(prev, next) switch_mm(prev, next, current) #define deactivate_mm(tsk, mm) do { } while (0) =20 -/* - * After we have set current->mm to a new value, this activates - * the context for the new mm so we see the new mappings. - */ -static inline void -activate_mm(struct mm_struct *prev, struct mm_struct *next) -{ - unsigned long flags; - unsigned int cpu =3D smp_processor_id(); - - local_irq_save(flags); - - htw_stop(); - /* Unconditionally get a new ASID. */ - get_new_mmu_context(next, cpu); - - write_c0_entryhi(cpu_asid(cpu, next)); - TLBMISS_HANDLER_SETUP_PGD(next->pgd); - - /* mark mmu ownership change */ - cpumask_clear_cpu(cpu, mm_cpumask(prev)); - cpumask_set_cpu(cpu, mm_cpumask(next)); - htw_start(); - - local_irq_restore(flags); -} - /* * If mm is currently active_mm, we can't really drop it. Instead, * we will get a new one for it. --=20 2.20.1