From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:51683) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fTue8-0000Zo-1M for qemu-devel@nongnu.org; Fri, 15 Jun 2018 15:44:32 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fTue7-0002gn-4a for qemu-devel@nongnu.org; Fri, 15 Jun 2018 15:44:32 -0400 Received: from mail-pg0-x241.google.com ([2607:f8b0:400e:c05::241]:37929) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1fTue6-0002gH-UT for qemu-devel@nongnu.org; Fri, 15 Jun 2018 15:44:31 -0400 Received: by mail-pg0-x241.google.com with SMTP id c9-v6so4855085pgf.5 for ; Fri, 15 Jun 2018 12:44:30 -0700 (PDT) From: Richard Henderson Date: Fri, 15 Jun 2018 09:43:51 -1000 Message-Id: <20180615194354.12489-17-richard.henderson@linaro.org> In-Reply-To: <20180615194354.12489-1-richard.henderson@linaro.org> References: <20180615194354.12489-1-richard.henderson@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Subject: [Qemu-devel] [PULL v2 16/19] cputlb: remove tb_lock from tlb_flush functions List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: peter.maydell@linaro.org, "Emilio G. Cota" From: "Emilio G. Cota" The acquisition of tb_lock was added when the async tlb_flush was introduced in e3b9ca810 ("cputlb: introduce tlb_flush_* async work.") tb_lock was there to allow us to do memset() on the tb_jmp_cache's. However, since f3ced3c5928 ("tcg: consistently access cpu->tb_jmp_cache atomically") all accesses to tb_jmp_cache are atomic, so tb_lock is not needed here. Get rid of it. Reviewed-by: Alex Bennée Reviewed-by: Richard Henderson Signed-off-by: Emilio G. Cota Signed-off-by: Richard Henderson --- accel/tcg/cputlb.c | 8 -------- 1 file changed, 8 deletions(-) diff --git a/accel/tcg/cputlb.c b/accel/tcg/cputlb.c index 0a721bb9c4..719cca2268 100644 --- a/accel/tcg/cputlb.c +++ b/accel/tcg/cputlb.c @@ -125,8 +125,6 @@ static void tlb_flush_nocheck(CPUState *cpu) atomic_set(&env->tlb_flush_count, env->tlb_flush_count + 1); tlb_debug("(count: %zu)\n", tlb_flush_count()); - tb_lock(); - memset(env->tlb_table, -1, sizeof(env->tlb_table)); memset(env->tlb_v_table, -1, sizeof(env->tlb_v_table)); cpu_tb_jmp_cache_clear(cpu); @@ -135,8 +133,6 @@ static void tlb_flush_nocheck(CPUState *cpu) env->tlb_flush_addr = -1; env->tlb_flush_mask = 0; - tb_unlock(); - atomic_mb_set(&cpu->pending_tlb_flush, 0); } @@ -180,8 +176,6 @@ static void tlb_flush_by_mmuidx_async_work(CPUState *cpu, run_on_cpu_data data) assert_cpu_is_self(cpu); - tb_lock(); - tlb_debug("start: mmu_idx:0x%04lx\n", mmu_idx_bitmask); for (mmu_idx = 0; mmu_idx < NB_MMU_MODES; mmu_idx++) { @@ -197,8 +191,6 @@ static void tlb_flush_by_mmuidx_async_work(CPUState *cpu, run_on_cpu_data data) cpu_tb_jmp_cache_clear(cpu); tlb_debug("done\n"); - - tb_unlock(); } void tlb_flush_by_mmuidx(CPUState *cpu, uint16_t idxmap) -- 2.17.1