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Miller" , Andreas Larsson , Richard Weinberger , Anton Ivanov , Johannes Berg , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Herbert Xu , Dan Williams , Chris Mason , David Sterba , Arnd Bergmann , Song Liu , Yu Kuai , Li Nan , linux-alpha@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, loongarch@lists.linux.dev, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, linux-um@lists.infradead.org, linux-crypto@vger.kernel.org, linux-btrfs@vger.kernel.org, linux-arch@vger.kernel.org, linux-raid@vger.kernel.org Subject: Re: [PATCH 03/25] um/xor: don't override XOR_SELECT_TEMPLATE Message-ID: <20260228043006.GA65277@quark> References: <20260226151106.144735-1-hch@lst.de> <20260226151106.144735-4-hch@lst.de> X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260226151106.144735-4-hch@lst.de> On Thu, Feb 26, 2026 at 07:10:15AM -0800, Christoph Hellwig wrote: > XOR_SELECT_TEMPLATE is only ever called with a NULL argument, so all the > ifdef'ery doesn't do anything. With our without this, the time travel > mode should work fine on CPUs that support AVX2, as the AVX2 > implementation is forced in this case, and won't work otherwise. > > Signed-off-by: Christoph Hellwig > --- > arch/um/include/asm/xor.h | 10 ---------- > 1 file changed, 10 deletions(-) > > diff --git a/arch/um/include/asm/xor.h b/arch/um/include/asm/xor.h > index 647fae200c5d..c9ddedc19301 100644 > --- a/arch/um/include/asm/xor.h > +++ b/arch/um/include/asm/xor.h > @@ -4,21 +4,11 @@ > > #ifdef CONFIG_64BIT > #undef CONFIG_X86_32 > -#define TT_CPU_INF_XOR_DEFAULT (AVX_SELECT(&xor_block_sse_pf64)) > #else > #define CONFIG_X86_32 1 > -#define TT_CPU_INF_XOR_DEFAULT (AVX_SELECT(&xor_block_8regs)) > #endif > > #include > #include <../../x86/include/asm/xor.h> > -#include > - > -#ifdef CONFIG_UML_TIME_TRAVEL_SUPPORT > -#undef XOR_SELECT_TEMPLATE > -/* pick an arbitrary one - measuring isn't possible with inf-cpu */ > -#define XOR_SELECT_TEMPLATE(x) \ > - (time_travel_mode == TT_MODE_INFCPU ? TT_CPU_INF_XOR_DEFAULT : x) > -#endif I'm not following this change. Previously, in TT_MODE_INFCPU mode, XOR_SELECT_TEMPLATE(NULL) returned &xor_block_avx, &xor_block_sse_pf64, or &xor_block_8regs, causing the benchmark to be skipped. After this change, the benchmark starts being done on CPUs that don't support AVX. - Eric