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Fri, 02 Oct 2026 17:21:36 -0700 (PDT) Date: Sat, 3 Oct 2026 00:21:06 +0000 In-Reply-To: <20261003002123.505555-1-jthoughton@google.com> Mime-Version: 1.0 References: <20261003002123.505555-1-jthoughton@google.com> X-Mailer: git-send-email 2.56.0.rc1.315.gc6ed9934b7-goog Message-ID: <20261003002123.505555-4-jthoughton@google.com> Subject: [PATCH v2 03/20] hugetlb_vmemmap: Always flush TLB if needed upon PTE remapping From: James Houghton To: Will Deacon , Catalin Marinas , Muchun Song , Oscar Salvador , Andrew Morton Cc: Nikos Nikoleris , Linu Cherian , Mark Rutland , David Hildenbrand , Ryan Roberts , Nanyong Sun , Yu Zhao , Frank van der Linden , David Rientjes , James Houghton , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org Content-Type: text/plain; charset="UTF-8" X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20261002_172139_151635_69741263 X-CRM114-Status: GOOD ( 12.01 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org vmemmap_remap_range() can potentially leave the vmemmap in a partially optimized state. In this case, a TLB flush should be done if the walk caller asked for it, even if the optimization was not fully applied. A follow-up patch will more completely deal with partially-optimized folios. Signed-off-by: James Houghton --- mm/hugetlb_vmemmap.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/mm/hugetlb_vmemmap.c b/mm/hugetlb_vmemmap.c index 0057fa2a16a8..1a2645c382ba 100644 --- a/mm/hugetlb_vmemmap.c +++ b/mm/hugetlb_vmemmap.c @@ -163,13 +163,11 @@ static int vmemmap_remap_range(unsigned long start, unsigned long end, ret = walk_kernel_page_table_range(start, end, &vmemmap_remap_ops, NULL, walk); mmap_read_unlock(&init_mm); - if (ret) - return ret; if (walk->remap_pte && !(walk->flags & VMEMMAP_REMAP_NO_TLB_FLUSH)) flush_tlb_kernel_range(start, end); - return 0; + return ret; } /* -- 2.56.0.rc1.315.gc6ed9934b7-goog