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Sat, 2 Feb 2019 01:43:23 +0000 From: Paul Burton To: "linux-mips@vger.kernel.org" CC: Paul Burton Subject: [PATCH 05/14] MIPS: mm: Consolidate drop_mmu_context() has-ASID checks Thread-Topic: [PATCH 05/14] MIPS: mm: Consolidate drop_mmu_context() has-ASID checks Thread-Index: AQHUupis8W8LOrjv3EuxCruob30+/w== Date: Sat, 2 Feb 2019 01:43:19 +0000 Message-ID: <20190202014242.30680-6-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:BtmowXMP4T0SdFmILQeNUmkHASedPq2MmGzspG8Z8UkxbPPKsGGvZDM3rMcA+n+o9NWc25G6kXND7TxbDDrDXSw0/Rw6iSoZd9dIHcyc+R2hZUfegUz5WZ7Fy9M6VGPQIsZ/HA5HfroWtX2Q52yaFeozjZ4e4pG3nXHAGxK+pbbzFcCPmK+p0sZx8GuJSOtCdi/eHJUIzN7vz+qeB4N/Kx+dEAWMaKa8tXIkQYikS/7fMaj4QzPiudGgmq/aNgp7Pg0wpG+q+JDBwq6fBhjsfz43giLdXwxjzZb3STtqBty7jPU+hKSxIBcVwGpbibSCK7SC8gurKzCskwRDwh+hKLWRou6dneRhIDmvBiabdSNF2vzcHaFK7kkhfXF7u0NrOc3JE6whoROc2prv0IwOJcZ67SuDrSQmdz+9cvrN04vxnf1k4weizWFQOexmT8gPqqyNGxLezTbBRjLcTwlCRg==;5:svcnaWmJM1eb5VXhwxSqysKbgamuYSNwbTd+5v+a2CsraRviDVzapEio1QAyTusigF7y+FU79xsWW70X7H/JJSbk34XL/KdY4W16l8ytWguAOxjRx0AWZXUuOFpr1eNa+qO+na4vK4g2p/JovGvrNsOT5GOwHc3pcTedoD1lD43zvlpqFg0L8a/jt1X2kK00TcDaWj/311dw1DzYSHyoZA==;7:Ol9sN3v8WpfWoDpoZPxbWRzPzPwq+nVIRq8F4SZBUttDWzQ+Sa2uWS0zbmp1jd5HJQj0V8A85k6faRTmZjLYvbcGNvHVtpetUjtue4cqx/+CtiwJW7OE8P9WitFaTAi7/kfHQs1LztciSHhucREN3Q== x-ms-office365-filtering-correlation-id: 662fecae-6b2b-4439-621c-08d688afcef6 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: 662fecae-6b2b-4439-621c-08d688afcef6 X-MS-Exchange-CrossTenant-originalarrivaltime: 02 Feb 2019 01:43:19.1360 (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 If an mm does not have an ASID on the local CPU then drop_mmu_context() is always redundant, since there's no context to "drop". Various callers of drop_mmu_context() check whether the mm has been allocated an ASID before making the call. Move that check into drop_mmu_context() and remove it from callers to simplify them. Signed-off-by: Paul Burton --- arch/mips/include/asm/mmu_context.h | 4 +++- arch/mips/mm/c-r4k.c | 5 +---- arch/mips/mm/tlb-r3k.c | 8 ++++---- arch/mips/mm/tlb-r4k.c | 10 +--------- arch/mips/mm/tlb-r8k.c | 5 +---- 5 files changed, 10 insertions(+), 22 deletions(-) diff --git a/arch/mips/include/asm/mmu_context.h b/arch/mips/include/asm/mm= u_context.h index 5d0a73a5cf40..1b8392dcd354 100644 --- a/arch/mips/include/asm/mmu_context.h +++ b/arch/mips/include/asm/mmu_context.h @@ -186,7 +186,9 @@ drop_mmu_context(struct mm_struct *mm) local_irq_save(flags); =20 cpu =3D smp_processor_id(); - if (cpumask_test_cpu(cpu, mm_cpumask(mm))) { + if (!cpu_context(cpu, mm)) { + /* no-op */ + } else if (cpumask_test_cpu(cpu, mm_cpumask(mm))) { htw_stop(); get_new_mmu_context(mm); write_c0_entryhi(cpu_asid(cpu, mm)); diff --git a/arch/mips/mm/c-r4k.c b/arch/mips/mm/c-r4k.c index 1eca2b7e8a28..248d9e8263cf 100644 --- a/arch/mips/mm/c-r4k.c +++ b/arch/mips/mm/c-r4k.c @@ -697,10 +697,7 @@ static inline void local_r4k_flush_cache_page(void *ar= gs) } if (exec) { if (vaddr && cpu_has_vtag_icache && mm =3D=3D current->active_mm) { - int cpu =3D smp_processor_id(); - - if (cpu_context(cpu, mm) !=3D 0) - drop_mmu_context(mm); + drop_mmu_context(mm); } else vaddr ? r4k_blast_icache_page(addr) : r4k_blast_icache_user_page(addr); diff --git a/arch/mips/mm/tlb-r3k.c b/arch/mips/mm/tlb-r3k.c index 05a5ddccd9da..60eb7a114440 100644 --- a/arch/mips/mm/tlb-r3k.c +++ b/arch/mips/mm/tlb-r3k.c @@ -69,14 +69,14 @@ void local_flush_tlb_all(void) =20 void local_flush_tlb_mm(struct mm_struct *mm) { +#ifdef DEBUG_TLB int cpu =3D smp_processor_id(); =20 - if (cpu_context(cpu, mm) !=3D 0) { -#ifdef DEBUG_TLB + if (cpu_context(cpu, mm) !=3D 0) printk("[tlbmm<%lu>]", (unsigned long)cpu_context(cpu, mm)); #endif - drop_mmu_context(mm); - } + + drop_mmu_context(mm); } =20 void local_flush_tlb_range(struct vm_area_struct *vma, unsigned long start= , diff --git a/arch/mips/mm/tlb-r4k.c b/arch/mips/mm/tlb-r4k.c index 6c99dfff71b2..ba76b0c11d38 100644 --- a/arch/mips/mm/tlb-r4k.c +++ b/arch/mips/mm/tlb-r4k.c @@ -108,16 +108,8 @@ EXPORT_SYMBOL(local_flush_tlb_all); these entries, we just bump the asid. */ void local_flush_tlb_mm(struct mm_struct *mm) { - int cpu; - preempt_disable(); - - cpu =3D smp_processor_id(); - - if (cpu_context(cpu, mm) !=3D 0) { - drop_mmu_context(mm); - } - + drop_mmu_context(mm); preempt_enable(); } =20 diff --git a/arch/mips/mm/tlb-r8k.c b/arch/mips/mm/tlb-r8k.c index 20fa35d21776..c938d6b497ef 100644 --- a/arch/mips/mm/tlb-r8k.c +++ b/arch/mips/mm/tlb-r8k.c @@ -52,10 +52,7 @@ void local_flush_tlb_all(void) =20 void local_flush_tlb_mm(struct mm_struct *mm) { - int cpu =3D smp_processor_id(); - - if (cpu_context(cpu, mm) !=3D 0) - drop_mmu_context(mm); + drop_mmu_context(mm); } =20 void local_flush_tlb_range(struct vm_area_struct *vma, unsigned long start= , --=20 2.20.1