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Message-ID: <2ac9e722-949b-aa92-3553-df1bf69bf9e5@molgen.mpg.de> Date: Tue, 14 Jul 2020 14:16:44 +0200 From: Paul Menzel <pmenzel@...gen.mpg.de> To: Sami Tolvanen <samitolvanen@...gle.com> Cc: Masahiro Yamada <masahiroy@...nel.org>, Will Deacon <will@...nel.org>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, "Paul E. McKenney" <paulmck@...nel.org>, Kees Cook <keescook@...omium.org>, Nick Desaulniers <ndesaulniers@...gle.com>, clang-built-linux@...glegroups.com, Kernel Hardening <kernel-hardening@...ts.openwall.com>, linux-arch@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, linux-kbuild <linux-kbuild@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>, linux-pci@...r.kernel.org, x86@...nel.org Subject: Re: [PATCH 00/22] add support for Clang LTO Dear Sami, Am 13.07.20 um 01:34 schrieb Sami Tolvanen: > On Sat, Jul 11, 2020 at 9:32 AM Paul Menzel <pmenzel@...gen.mpg.de> wrote: >> Thank you very much for sending these changes. >> >> Do you have a branch, where your current work can be pulled from? Your >> branch on GitHub [1] seems 15 months old. > > The clang-lto branch is rebased regularly on top of Linus' tree. > GitHub just looks at the commit date of the last commit in the tree, > which isn't all that informative. Thank you for clearing this up, and sorry for not checking myself. >> Out of curiosity, I applied the changes, allowed the selection for i386 >> (x86), and with Clang 1:11~++20200701093119+ffee8040534-1~exp1 from >> Debian experimental, it failed with `Invalid absolute R_386_32 >> relocation: KERNEL_PAGES`: > > I haven't looked at getting this to work on i386, which is why we only > select ARCH_SUPPORTS_LTO for x86_64. I would expect there to be a few > issues to address. > >>> arch/x86/tools/relocs vmlinux > arch/x86/boot/compressed/vmlinux.relocs;arch/x86/tools/relocs --abs-relocs vmlinux >>> Invalid absolute R_386_32 relocation: KERNEL_PAGES > > KERNEL_PAGES looks like a constant, so it's probably safe to ignore > the absolute relocation in tools/relocs.c. Thank you for pointing me to the right direction. I am happy to report, that with the diff below (no idea to what list to add the string), Linux 5.8-rc5 with the LLVM/Clang/LTO patches on top, builds and boots on the ASRock E350M1. ``` diff --git a/arch/x86/tools/relocs.c b/arch/x86/tools/relocs.c index 8f3bf34840cef..e91af127ed3c0 100644 --- a/arch/x86/tools/relocs.c +++ b/arch/x86/tools/relocs.c @@ -79,6 +79,7 @@ static const char * const sym_regex_kernel[S_NSYMTYPES] = { "__end_rodata_hpage_align|" #endif "__vvar_page|" + "KERNEL_PAGES|" "_end)$" }; ``` Kind regards, Paul
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