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Howlett" , Vlastimil Babka , Shakeel Butt , David Hildenbrand , Mike Rapoport , Michal Hocko , Uladzislau Rezki , Toshi Kani , Dave Hansen , Andy Lutomirski , Peter Zijlstra , Thomas Gleixner , Ingo Molnar , Borislav Petkov , x86@kernel.org, "H. Peter Anvin" , Catalin Marinas , Will Deacon , Dev Jain , Ryan Roberts , David Carlier , linux-mm@kvack.org, linux-kernel@vger.kernel.org, bpf@vger.kernel.org, linux-arm-kernel@lists.infradead.org, stable@vger.kernel.org Subject: Re: [PATCH mm-hotfixes v2 4/4] arm64: remove redundant concurrent ptdump UAF mitigation Message-ID: References: <20260712-series-vmap-race-fix-v2-0-ad134cc3a12a@kernel.org> <20260712-series-vmap-race-fix-v2-4-ad134cc3a12a@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260712-series-vmap-race-fix-v2-4-ad134cc3a12a@kernel.org> 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 On Sun, Jul 12, 2026 at 11:42:27AM +0100, Lorenzo Stoakes wrote: > This partially reverts commit fa93b45fd397 ("arm64: Enable vmalloc-huge > with ptdump"), retaining vmalloc-huge support but eliminating the now > redundant mitigation against a race between huge vmap page table freeing > and ptdump, as this issue has now been fixed at core. > > We also simultaneously remove the arm64 if-deffery when acquiring the mmap > read lock upon vmap huge page table promotion as it is no longer required. > > Note that this patch relies on the preceding vmalloc patch, and should not > be backported alone. > > Fixes: fa93b45fd397 ("arm64: Enable vmalloc-huge with ptdump") > Cc: stable@vger.kernel.org > Reviewed-by: Dev Jain > Acked-by: Mike Rapoport (Microsoft) > Signed-off-by: Lorenzo Stoakes Acked-by: Kiryl Shutsemau (Meta) -- Kiryl Shutsemau / Kirill A. Shutemov