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Fri, 09 Oct 2026 14:05:05 -0700 (PDT) From: Magnus Lindholm To: richard.henderson@linaro.org, mattst88@gmail.com, linux-kernel@vger.kernel.org, linux-alpha@vger.kernel.org Cc: linmag7@gmail.com, stable@vger.kernel.org Subject: [PATCH v4 4/8] alpha: invalidate the local context in flush_tlb_page() Date: Fri, 9 Oct 2026 23:03:49 +0200 Message-ID: <20261009210449.971057-5-linmag7@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20261009210449.971057-1-linmag7@gmail.com> References: <20261009210449.971057-1-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 When the target mm is not the calling CPU's active_mm, flush_tlb_page() does nothing locally, and smp_call_function() reaches only the other CPUs. This CPU may still hold translations for the mm and can later reuse the old ASN together with them. Add the missing else branch. flush_tlb_other() clears mm->context[cpu] so a fresh ASN is taken at the next switch. Add this before changing the current->active_mm test to current->mm: that change will also send lazy callers here, so their local invalidate must already be in place. The uniprocessor implementations of flush_tlb_mm() and flush_icache_user_page() in asm/tlbflush.h and asm/cacheflush.h already contain exactly this branch. Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Cc: stable@vger.kernel.org Reviewed-by: Matt Turner Signed-off-by: Magnus Lindholm Message-ID: <20260923074903.862898-5-linmag7@gmail.com> --- arch/alpha/kernel/smp.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/alpha/kernel/smp.c b/arch/alpha/kernel/smp.c index 1ad448105201..e4ba0aab8a66 100644 --- a/arch/alpha/kernel/smp.c +++ b/arch/alpha/kernel/smp.c @@ -697,6 +697,9 @@ flush_tlb_page(struct vm_area_struct *vma, unsigned long addr) preempt_enable(); return; } + } else { + /* smp_call_function() does not call back into this CPU. */ + flush_tlb_other(mm); } data.vma = vma; -- 2.43.0