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[209.85.219.182]) by smtp.gmail.com with ESMTPSA id r19-20020a05620a299300b006eea4b5abcesm1880756qkp.89.2022.10.18.00.36.48 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 18 Oct 2022 00:36:48 -0700 (PDT) Received: by mail-yb1-f182.google.com with SMTP id j7so15992768ybb.8 for ; Tue, 18 Oct 2022 00:36:48 -0700 (PDT) X-Received: by 2002:a81:848c:0:b0:356:e173:2c7a with SMTP id u134-20020a81848c000000b00356e1732c7amr1276352ywf.502.1666078253767; Tue, 18 Oct 2022 00:30:53 -0700 (PDT) MIME-Version: 1.0 References: <20221018074014.185687-1-wangkefeng.wang@huawei.com> In-Reply-To: <20221018074014.185687-1-wangkefeng.wang@huawei.com> From: Geert Uytterhoeven Date: Tue, 18 Oct 2022 09:30:42 +0200 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH] mm: remove kern_addr_valid() completely To: Kefeng Wang Cc: Andrew Morton , linux-alpha@vger.kernel.org, linux-kernel@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, linux-ia64@vger.kernel.org, loongarch@lists.linux.dev, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, openrisc@lists.librecores.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-um@lists.infradead.org, linux-xtensa@linux-xtensa.org, linux-fsdevel@vger.kernel.org, Richard Henderson , Ivan Kokshaysky , Matt Turner , Vineet Gupta , Russell King , Catalin Marinas , Will Deacon , Guo Ren , Huacai Chen , WANG Xuerui , Greg Ungerer , Michal Simek , Thomas Bogendoerfer , Dinh Nguyen , Jonas Bonn , Stefan Kristiansson , Stafford Horne , "James E . J . Bottomley" , Helge Deller , Michael Ellerman , Nicholas Piggin , Christophe Leroy , Paul Walmsley , Palmer Dabbelt , Albert Ou , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , Yoshinori Sato , Rich Felker , "David S . Miller" , Richard Weinberger , Anton Ivanov , Johannes Berg , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H . Peter Anvin" , Andy Lutomirski , Peter Zijlstra , Chris Zankel , Max Filippov Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-m68k@vger.kernel.org On Tue, Oct 18, 2022 at 9:25 AM Kefeng Wang wrote: > Most architectures(except arm64/x86/sparc) simply return 1 for > kern_addr_valid(), which is only used in read_kcore(), and it > calls copy_from_kernel_nofault() which could check whether the > address is a valid kernel address, so no need kern_addr_valid(), > let's remove unneeded kern_addr_valid() completely. > > Signed-off-by: Kefeng Wang > arch/m68k/include/asm/pgtable_mm.h | 2 - > arch/m68k/include/asm/pgtable_no.h | 1 - Acked-by: Geert Uytterhoeven [m68k] Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds