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Tue, 12 Dec 2023 18:45:08 -0800 (PST) References: <20231122-arm64-gcs-v7-0-201c483bd775@kernel.org> <20231122-arm64-gcs-v7-37-201c483bd775@kernel.org> User-agent: mu4e 1.10.8; emacs 29.1 From: Thiago Jung Bauermann To: Mark Brown Cc: Catalin Marinas , Will Deacon , Jonathan Corbet , Andrew Morton , Marc Zyngier , Oliver Upton , James Morse , Suzuki K Poulose , Arnd Bergmann , Oleg Nesterov , Eric Biederman , Kees Cook , Shuah Khan , "Rick P. Edgecombe" , Deepak Gupta , Ard Biesheuvel , Szabolcs Nagy , "H.J. Lu" , Paul Walmsley , Palmer Dabbelt , Albert Ou , Florian Weimer , Christian Brauner , linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, kvmarm@lists.linux.dev, linux-fsdevel@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org Subject: Re: [PATCH v7 37/39] kselftest/arm64: Add a GCS stress test In-reply-to: <20231122-arm64-gcs-v7-37-201c483bd775@kernel.org> Date: Tue, 12 Dec 2023 23:45:06 -0300 Message-ID: <87zfyex1l9.fsf@linaro.org> MIME-Version: 1.0 Content-Type: text/plain X-Rspamd-Queue-Id: 94B4E1C0013 X-Rspam-User: X-Stat-Signature: 8rfgurd1f3pon4m7n8ix19k3x9884bd4 X-Rspamd-Server: rspam01 X-HE-Tag: 1702435510-668034 X-HE-Meta: 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 ggsRjcen prv1bKwHB10ySMaCzGeTrKC6aV3Ie7kwWHIVHhSLwjCDasHW8ihpvuH/H+GgG2TPQv1SwACe2bIgOU0p+ya2fBO7GJawztbku3qPfHwBX9hmjcpBBbXpPmOs8bm+z74XyciNwEDBlFgytgsCILdns09uvX6psdl0rOIzqLDT/IXTD8v2DvKWWXtK4nWxFxbK3AguzGt9g4IxdcXY0vbPlnE1u4xHZxj6ePch/ok9v5qKDhSsqmFc4cXioT3U1DXImpQDKtb9u9LhZpAHR6a1WUm0twQWC7P1vscUxy0sgbS9Vhw9kScFZX5eG+Vt6sI5tDrHQh5m3FhPTJaaJOUbLMfXkNjIbLjn47DnZVsRIdOQ4qY3S7TiGGXbg4vOYCUE5lUABypJUn9Lee2mHtmNMUSYKEgCWau/wixkmVi0XTEec731fXgje8RLh77XIIaipp2k8uSS0Txqe8lvzXWZ6ldwIzg== 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: List-Subscribe: List-Unsubscribe: I'm going a bit out-of-order to report a build failure in a test: Mark Brown writes: > +// Recurse x20 times > +.macro recurse id I get an assembler error here: gcc -nostdlib gcs-stress-thread.S -o /home/thiago.bauermann/src/linux/tools/testing/selftests/arm64/gcs/gcs-stress-thread gcs-stress-thread.S: Assembler messages: gcs-stress-thread.S:236: Error: unexpected end of file in macro `recurse' definition make[2]: *** [Makefile:24: /home/thiago.bauermann/src/linux/tools/testing/selftests/arm64/gcs/gcs-stress-thread] Error 1 This is with gas from Ubuntu 22.04, which ships binutils 2.38. > +function recurse\id > + stp x29, x30, [sp, #-16]! > + mov x29, sp > + > + cmp x20, 0 > + beq 1f > + sub x20, x20, 1 > + bl recurse\id > + > +1: > + ldp x29, x30, [sp], #16 > + > + // Do a syscall immediately prior to returning to try to provoke > + // scheduling and migration at a point where coherency issues > + // might trigger. > + mov x8, #__NR_getpid > + svc #0 > + > + ret > +endfunction > +.endmacro > + > +// Generate and use two copies so we're changing the GCS contents > +recurse 1 > +recurse 2 -- Thiago