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Mon, 10 Aug 2026 12:31:11 -0700 (PDT) Received: from buildhost.darklands.se ([2001:9b1:ff:d701:51eb:176f:63d9:53f8]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-6a1f4df3165sm3665532a12.10.2026.08.10.12.31.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 10 Aug 2026 12:31:10 -0700 (PDT) From: Magnus Lindholm To: linmag7@gmail.com Cc: stable@vger.kernel.org Subject: [PATCH 3/7] alpha: fix the local TLB invalidate in flush_tlb_page() Date: Mon, 10 Aug 2026 21:24:47 +0200 Message-ID: <20260810193055.3286239-4-linmag7@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260810193055.3286239-1-linmag7@gmail.com> References: <20260810193055.3286239-1-linmag7@gmail.com> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit flush_tlb_page() invalidates the calling CPU itself before asking the others, and gates that on current->active_mm. For a non-executable vma that means a targeted tbi(2, addr), which acts on the context currently loaded, so as in ipi_flush_tlb_page() it reaches nothing when only active_mm names the mm, and nothing forces the old ASN to be retired afterwards. Test current->mm instead. Reached in practice by folio_mkclean() from the writeback flusher kworker, which has no mm of its own: about half the calls during writeback of a shared mapping, and none at all on anonymous memory. The caller-CPU omission in the same function is fixed in the next patch. Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Cc: stable@vger.kernel.org Signed-off-by: Magnus Lindholm --- arch/alpha/kernel/smp.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/alpha/kernel/smp.c b/arch/alpha/kernel/smp.c index 1ad448105201..7856d23b3384 100644 --- a/arch/alpha/kernel/smp.c +++ b/arch/alpha/kernel/smp.c @@ -684,7 +684,8 @@ flush_tlb_page(struct vm_area_struct *vma, unsigned long addr) preempt_disable(); - if (mm == current->active_mm) { + /* As in ipi_flush_tlb_page(): a targeted tbi() needs MM current. */ + if (mm == current->mm) { flush_tlb_current_page(mm, vma, addr); if (atomic_read(&mm->mm_users) <= 1) { int cpu, this_cpu = smp_processor_id(); -- 2.53.0