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To: Vincenzo Frascino , Will Deacon References: <20191204101851.GC13081@arrakis.emea.arm.com> <1c5e497f-4be0-e1f3-4d6d-fed9470d0406@forissier.org> <20191204142824.GB26730@arrakis.emea.arm.com> <226a53f8-9404-1aa0-ed44-22e2157e4521@forissier.org> <20191204175726.GA28736@willie-the-truck> <20191205085709.GB8606@willie-the-truck> <20191206160955.GA27982@willie-the-truck> <740865eb-a993-d1dd-ad2e-84529e2012ee@forissier.org> <3523c365-62a0-1504-9b99-d5d030e000fd@arm.com> From: Jerome Forissier Message-ID: Date: Wed, 11 Dec 2019 09:57:01 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.2.2 MIME-Version: 1.0 In-Reply-To: <3523c365-62a0-1504-9b99-d5d030e000fd@arm.com> Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191211_005710_806910_057DC051 X-CRM114-Status: GOOD ( 12.27 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Catalin Marinas , "linux-arm-kernel@lists.infradead.org" , maz@kernel.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 12/10/19 5:26 PM, Vincenzo Frascino wrote: > Hi Jerome, > > On 12/10/19 4:20 PM, Jerome Forissier wrote: >> Now if you check the SHA1 hashes of arch/arm64/kernel/vdso/vdso.o in >> various scenarios: >> >> - v5.4, no ccache: >> b82810f6e9495eb8e787e82b4080654ce4afc30a >> - v5.4, with ccache, built from a clean cache: >> b82810f6e9495eb8e787e82b4080654ce4afc30a >> - v5.1, no ccache: >> 8c09a2f25969e2bf74799d6b3fb52d0fbc3d58a8 >> - v5.4, with ccache, after building v5.1 (step 3 above): >> 8c09a2f25969e2bf74799d6b3fb52d0fbc3d58a8 > > This clearly explains the issue and why you were suspecting the vdso library. > Happy that you figured it out. > Yeah. To put an end to this thread, and for the record, let me add that the ccache issue is triggered by CCACHE_UNIFY=1. If "unify" mode is not set (the default), there is no problem. I have filed a bug report with ccache [1]. [1] https://github.com/ccache/ccache/issues/497 -- Jerome _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel