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a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=aV5lAZFWsn30YUfYsELPUhW9S7mbkBmRP/hMNyYfqZs=; b=hpWsjJHNLYh3IKv3fqH+oT83Q5bk48bBWyfJikW2SOot0XF5VUD0CqbE4CIRMRz+mE x9bpPBVPiinqdDoj9z92a3WMz/v+1t21LK/fcIVRWHv6ocojQtiecaWhJQQ2S6ks6KzT X8Ess0DmekGr3dQibPun3GM6RyGFxfmRCPWeiXAXUfVbXwJiGSKw649lu4bIs/iKN6Dq xQhEh6uDZruhgBfEZP8j/gp1FnkTdQQGLmx+yK8b2aTGu9uEunXMw2ieIb/J+P/cCBt1 0sfXVsdeQbkdxQly3WjSWbIC4Uxpj17Q107IvmB+qQ/C58aC1PmPMyXivNdzgWRPkonV tz+w== X-Gm-Message-State: APjAAAX+5ZU5W4KQyYiIP0wISDIqdHE164Ca9w7PZw5TfOhvxWHbt9Nz 5OtzEcttggI0QtTuH0L4+F65yvZpLZVkQSu9DdL6nR6+Q5A/EA== X-Google-Smtp-Source: APXvYqxmT/aPAOAzrVmvcxwS+LFf8BI5WKEDF6VhBt2NpdkKbMIHBW1K7KgCZpnwz+BImRvjKBjgZKocRnwkofPEOJM= X-Received: by 2002:a17:902:9f93:: with SMTP id g19mr5425132plq.223.1565135254602; Tue, 06 Aug 2019 16:47:34 -0700 (PDT) MIME-Version: 1.0 References: <20190806183918.41078-1-broonie@kernel.org> In-Reply-To: From: Nick Desaulniers Date: Tue, 6 Aug 2019 16:47:23 -0700 Message-ID: Subject: Re: [PATCH] arm64: Disable big endian builds with clang To: Mark Brown X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190806_164735_902981_2D6962F8 X-CRM114-Status: GOOD ( 20.14 ) 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: Tri Vo , Catalin Marinas , Nathan Huckleberry , clang-built-linux , Nathan Chancellor , Will Deacon , Linux ARM 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 Tue, Aug 6, 2019 at 2:25 PM Nick Desaulniers wrote: > > On Tue, Aug 6, 2019 at 11:39 AM Mark Brown wrote: > > > > Current boot tests with clang built big endian kernels in KernelCI are > > showing problems with the kernel being unable to interpret big endian > > userspace. This is a bug and should be fixed but for now let's prevent > > these kernels being built, we may end up needing to add a version > > dependency on the compiler anyway. > > > > Signed-off-by: Mark Brown > > Link: https://github.com/ClangBuiltLinux/linux/issues/628 > Acked-by: Nick Desaulniers +Huck Huck notes that the device eventually boots in qemu, it just takes on the order of 165 seconds to boot. What's the timeout on KernelCI? I think if we can determine why we see: [ 144.626755] request_module: kmod_concurrent_max (0) close to 0 (max_modprobes: 50), for module binfmt-4c46, throttling... [ 149.752826] request_module: modprobe binfmt-4c46 cannot be processed, kmod busy with 50 threads for more than 5 seconds now a lot, then we don't actually need to disable this outright when building w/ Clang? > > > --- > > > > The clang people (CCed) are aware and looking into this. > > > > arch/arm64/Kconfig | 1 + > > 1 file changed, 1 insertion(+) > > > > diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig > > index 990fdcbf05c7..1c32d9889e0f 100644 > > --- a/arch/arm64/Kconfig > > +++ b/arch/arm64/Kconfig > > @@ -813,6 +813,7 @@ config ARM64_PA_BITS > > > > config CPU_BIG_ENDIAN > > bool "Build big-endian kernel" > > + depends on !CC_IS_CLANG > > help > > Say Y if you plan on running a kernel in big-endian mode. -- Thanks, ~Nick Desaulniers _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel