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Thu, 27 Nov 2025 06:12:14 -0800 (PST) Received: from J9GPGXL7NT.bytedance.net ([61.213.176.58]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-3477b7341d2sm2030249a91.11.2025.11.27.06.11.57 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Thu, 27 Nov 2025 06:12:14 -0800 (PST) From: Xu Lu To: pjw@kernel.org, palmer@dabbelt.com, aou@eecs.berkeley.edu, alex@ghiti.fr, kees@kernel.org, mingo@redhat.com, peterz@infradead.org, juri.lelli@redhat.com, vincent.guittot@linaro.org, akpm@linux-foundation.org, david@redhat.com, apatel@ventanamicro.com, guoren@kernel.org Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Xu Lu Subject: [RFC PATCH v2 4/9] fork: Add arch override for do_shoot_lazy_tlb() Date: Thu, 27 Nov 2025 22:11:12 +0800 Message-ID: <20251127141117.87420-5-luxu.kernel@bytedance.com> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20251127141117.87420-1-luxu.kernel@bytedance.com> References: <20251127141117.87420-1-luxu.kernel@bytedance.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" When both CONFIG_RISCV_LAZY_TLB_FLUSH and CONFIG_MMU_LSYZ_TLB_SHOOTDOWN is enabled, riscv needs an arch special method to free the mm that needs to be shot down. Thus we add arch override for do_shoot_lazy_tlb(). Signed-off-by: Xu Lu --- kernel/fork.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/kernel/fork.c b/kernel/fork.c index 3da0f08615a95..b6d11acd6ac10 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -612,7 +612,8 @@ static void do_check_lazy_tlb(void *arg) WARN_ON_ONCE(current->active_mm =3D=3D mm); } =20 -static void do_shoot_lazy_tlb(void *arg) +#ifndef arch_do_shoot_lazy_tlb +static void arch_do_shoot_lazy_tlb(void *arg) { struct mm_struct *mm =3D arg; =20 @@ -622,6 +623,7 @@ static void do_shoot_lazy_tlb(void *arg) switch_mm(mm, &init_mm, current); } } +#endif =20 static void cleanup_lazy_tlbs(struct mm_struct *mm) { @@ -661,7 +663,7 @@ static void cleanup_lazy_tlbs(struct mm_struct *mm) * - A delayed freeing and RCU-like quiescing sequence based on mm * switching to avoid IPIs completely. */ - on_each_cpu_mask(mm_cpumask(mm), do_shoot_lazy_tlb, (void *)mm, 1); + on_each_cpu_mask(mm_cpumask(mm), arch_do_shoot_lazy_tlb, (void *)mm, 1); if (IS_ENABLED(CONFIG_DEBUG_VM_SHOOT_LAZIES)) on_each_cpu(do_check_lazy_tlb, (void *)mm, 1); } --=20 2.20.1