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Thu, 06 Mar 2025 00:49:39 -0800 (PST) Date: Thu, 6 Mar 2025 00:49:37 -0800 From: Charlie Jenkins To: Ignacio Encinas Rubio Cc: linux-kernel-mentees@lists.linux.dev, skhan@linuxfoundation.org, Paul Walmsley , Palmer Dabbelt , Alexandre Ghiti , linux-kselftest@vger.kernel.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] selftests: riscv: fix v_exec_initval_nolibc.c Message-ID: References: <20250305-fix-v_exec_initval_nolibc-v1-1-b87b60e43002@iencinas.com> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Thu, Mar 06, 2025 at 07:31:22AM +0100, Ignacio Encinas Rubio wrote: > > > On 5/3/25 22:49, Charlie Jenkins wrote: > > On Wed, Mar 05, 2025 at 05:39:28PM +0100, Ignacio Encinas wrote: > >> Vector registers are zero initialized by the kernel. Stop accepting > >> "all ones" as a clean value. > >> > >> Note that this was not working as expected given that > >> value == 0xff > >> can be assumed to be always false by the compiler as value's range is > >> [-128, 127]. Both GCC (-Wtype-limits) and clang > >> (-Wtautological-constant-out-of-range-compare) warn about this. > > > > This check was included because the "dirty" value is an implementation > > detail that I believe is not strongly defined in the ABI. Since linux > > does always set this value to zero (currently) we can safely remove this > > check. > > Thanks for the review. Just after sending the patch I noticed it should > also remove some code that becomes useless after this change: > _prev_value_ and _first_ variables were only needed because two "clean" > values were supported. > > I'll send a v2 tomorrow. I'm guessing keeping your "Reviewed-by" and > "Tested-by" is the appropriate thing to do as the changes are very > simple. Let me know if that's not the case. > > Thanks again! Yes, those changes seem small so you can keep the tags :) - Charlie