linux-kernel - [PATCH v7 06/16] perf: RISC-V: Eliminate redundant interrupt enable/disable operations

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date: Wed, 10 Jan 2024 15:39:07 +0800
From: Yu Chien Peter Lin <peterlin@...estech.com>
To: <acme@...nel.org>, <adrian.hunter@...el.com>, <ajones@...tanamicro.com>,
        <alexander.shishkin@...ux.intel.com>, <andre.przywara@....com>,
        <anup@...infault.org>, <aou@...s.berkeley.edu>,
        <atishp@...shpatra.org>, <conor+dt@...nel.org>,
        <conor.dooley@...rochip.com>, <conor@...nel.org>,
        <devicetree@...r.kernel.org>, <dminus@...estech.com>,
        <evan@...osinc.com>, <geert+renesas@...der.be>, <guoren@...nel.org>,
        <heiko@...ech.de>, <irogers@...gle.com>, <jernej.skrabec@...il.com>,
        <jolsa@...nel.org>, <jszhang@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <linux-perf-users@...r.kernel.org>,
        <linux-renesas-soc@...r.kernel.org>, <linux-riscv@...ts.infradead.org>,
        <linux-sunxi@...ts.linux.dev>, <locus84@...estech.com>,
        <magnus.damm@...il.com>, <mark.rutland@....com>, <mingo@...hat.com>,
        <n.shubin@...ro.com>, <namhyung@...nel.org>, <palmer@...belt.com>,
        <paul.walmsley@...ive.com>, <peterlin@...estech.com>,
        <peterz@...radead.org>, <prabhakar.mahadev-lad.rj@...renesas.com>,
        <rdunlap@...radead.org>, <robh+dt@...nel.org>, <samuel@...lland.org>,
        <sunilvl@...tanamicro.com>, <tglx@...utronix.de>,
        <tim609@...estech.com>, <uwu@...nowy.me>, <wens@...e.org>,
        <will@...nel.org>, <ycliang@...estech.com>, <inochiama@...look.com>,
        <chao.wei@...hgo.com>, <unicorn_wang@...look.com>, <wefu@...hat.com>
Subject: [PATCH v7 06/16] perf: RISC-V: Eliminate redundant interrupt enable/disable operations

The interrupt enable/disable operations are already performed by the
IRQ chip functions riscv_intc_irq_unmask()/riscv_intc_irq_mask() during
enable_percpu_irq()/disable_percpu_irq(). It can be done only once.

Signed-off-by: Yu Chien Peter Lin <peterlin@...estech.com>
---
This patch allows us to drop unnecessary ALT_SBI_PMU_OVF_{DISABLE,ENABLE}
in the initial PATCH3 [1].

[1] https://patchwork.kernel.org/project/linux-riscv/patch/20230907021635.1002738-4-peterlin@andestech.com/

Changes v1 -> v2:
  - New patch
Changes v2 -> v3:
  - No change
Changes v3 -> v4:
  - No change
Changes v4 -> v5:
  - No change
Changes v5 -> v6:
  - No change
Changes v6 -> v7:
  - No change
---
 drivers/perf/riscv_pmu_sbi.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/perf/riscv_pmu_sbi.c b/drivers/perf/riscv_pmu_sbi.c
index 16acd4dcdb96..2edbc37abadf 100644
--- a/drivers/perf/riscv_pmu_sbi.c
+++ b/drivers/perf/riscv_pmu_sbi.c
@@ -781,7 +781,6 @@ static int pmu_sbi_starting_cpu(unsigned int cpu, struct hlist_node *node)
 	if (riscv_pmu_use_irq) {
 		cpu_hw_evt->irq = riscv_pmu_irq;
 		csr_clear(CSR_IP, BIT(riscv_pmu_irq_num));
-		csr_set(CSR_IE, BIT(riscv_pmu_irq_num));
 		enable_percpu_irq(riscv_pmu_irq, IRQ_TYPE_NONE);
 	}
 
@@ -792,7 +791,6 @@ static int pmu_sbi_dying_cpu(unsigned int cpu, struct hlist_node *node)
 {
 	if (riscv_pmu_use_irq) {
 		disable_percpu_irq(riscv_pmu_irq);
-		csr_clear(CSR_IE, BIT(riscv_pmu_irq_num));
 	}
 
 	/* Disable all counters access for user mode now */
-- 
2.34.1