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[222.224.135.17]) by smtp.gmail.com with ESMTPSA id c134sm9652932pfb.135.2021.05.04.23.27.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 04 May 2021 23:27:33 -0700 (PDT) Date: Wed, 5 May 2021 15:27:31 +0900 From: Stafford Horne To: Anshuman Khandual Cc: linux-mm@kvack.org, akpm@linux-foundation.org, Richard Henderson , Vineet Gupta , Catalin Marinas , Will Deacon , Guo Ren , Brian Cain , Geert Uytterhoeven , Michal Simek , Thomas Bogendoerfer , Ley Foon Tan , Jonas Bonn , Stefan Kristiansson , "James E.J. Bottomley" , Michael Ellerman , Christophe Leroy , Paul Walmsley , Palmer Dabbelt , Heiko Carstens , Yoshinori Sato , "David S. Miller" , Jeff Dike , Thomas Gleixner , Chris Zankel , linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH V2] mm: Define default value for FIRST_USER_ADDRESS Message-ID: <20210505062731.GS3288043@lianli.shorne-pla.net> References: <1618550254-14511-1-git-send-email-anshuman.khandual@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1618550254-14511-1-git-send-email-anshuman.khandual@arm.com> Authentication-Results: imf30.hostedemail.com; dkim=pass header.d=gmail.com header.s=20161025 header.b=mcr1f1QL; spf=pass (imf30.hostedemail.com: domain of shorne@gmail.com designates 209.85.210.175 as permitted sender) smtp.mailfrom=shorne@gmail.com; dmarc=pass (policy=none) header.from=gmail.com X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: AC058E00010B X-Stat-Signature: sub5guocnqdemihd4xmyyr9wgd4zm7zc Received-SPF: none (gmail.com>: No applicable sender policy available) receiver=imf30; identity=mailfrom; envelope-from=""; helo=mail-pf1-f175.google.com; client-ip=209.85.210.175 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1620196030-742317 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Fri, Apr 16, 2021 at 10:47:34AM +0530, Anshuman Khandual wrote: > Currently most platforms define FIRST_USER_ADDRESS as 0UL duplication the > same code all over. Instead just define a generic default value (i.e 0UL) > for FIRST_USER_ADDRESS and let the platforms override when required. This > makes it much cleaner with reduced code. > > The default FIRST_USER_ADDRESS here would be skipped in > when the given platform overrides its value via . > > Cc: Richard Henderson > Cc: Vineet Gupta > Cc: Catalin Marinas > Cc: Will Deacon > Cc: Guo Ren > Cc: Brian Cain > Cc: Geert Uytterhoeven > Cc: Michal Simek > Cc: Thomas Bogendoerfer > Cc: Ley Foon Tan > Cc: Jonas Bonn > Cc: Stefan Kristiansson > Cc: Stafford Horne > Cc: "James E.J. Bottomley" > Cc: Michael Ellerman > Cc: Christophe Leroy > Cc: Paul Walmsley > Cc: Palmer Dabbelt > Cc: Heiko Carstens > Cc: Yoshinori Sato > Cc: "David S. Miller" > Cc: Jeff Dike > Cc: Thomas Gleixner > Cc: Chris Zankel > Cc: Andrew Morton > Cc: linux-arch@vger.kernel.org > Cc: linux-mm@kvack.org > Cc: linux-kernel@vger.kernel.org > Signed-off-by: Anshuman Khandual > --- > This applies on v5.12-rc7 and has been boot tested on arm64 platform. > But has been cross compiled on multiple other platforms. > > Changes in V2: > > - Dropped ARCH_HAS_FIRST_USER_ADDRESS construct > > Changes in V1: > > https://patchwork.kernel.org/project/linux-mm/patch/1618368899-20311-1-git-send-email-anshuman.khandual@arm.com/ > > arch/alpha/include/asm/pgtable.h | 1 - > arch/arc/include/asm/pgtable.h | 6 ------ > arch/arm64/include/asm/pgtable.h | 2 -- > arch/csky/include/asm/pgtable.h | 1 - > arch/hexagon/include/asm/pgtable.h | 3 --- > arch/ia64/include/asm/pgtable.h | 1 - > arch/m68k/include/asm/pgtable_mm.h | 1 - > arch/microblaze/include/asm/pgtable.h | 2 -- > arch/mips/include/asm/pgtable-32.h | 1 - > arch/mips/include/asm/pgtable-64.h | 1 - > arch/nios2/include/asm/pgtable.h | 2 -- > arch/openrisc/include/asm/pgtable.h | 1 - Acked-by: Stafford Horne > arch/parisc/include/asm/pgtable.h | 2 -- > arch/powerpc/include/asm/book3s/pgtable.h | 1 - > arch/powerpc/include/asm/nohash/32/pgtable.h | 1 - > arch/powerpc/include/asm/nohash/64/pgtable.h | 2 -- > arch/riscv/include/asm/pgtable.h | 2 -- > arch/s390/include/asm/pgtable.h | 2 -- > arch/sh/include/asm/pgtable.h | 2 -- > arch/sparc/include/asm/pgtable_32.h | 1 - > arch/sparc/include/asm/pgtable_64.h | 3 --- > arch/um/include/asm/pgtable-2level.h | 1 - > arch/um/include/asm/pgtable-3level.h | 1 - > arch/x86/include/asm/pgtable_types.h | 2 -- > arch/xtensa/include/asm/pgtable.h | 1 - > include/linux/pgtable.h | 9 +++++++++ > 26 files changed, 9 insertions(+), 43 deletions(-) This all looks fine to me, will this be merged via the arm tree? I guess you have a means for that. -Stafford