Date: Wed, 24 Jun 2020 16:51:44 -0700 From: Andi Kleen <ak@...ux.intel.com> To: Nick Desaulniers <ndesaulniers@...gle.com> Cc: Sami Tolvanen <samitolvanen@...gle.com>, 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>, clang-built-linux <clang-built-linux@...glegroups.com>, Kernel Hardening <kernel-hardening@...ts.openwall.com>, linux-arch <linux-arch@...r.kernel.org>, Linux ARM <linux-arm-kernel@...ts.infradead.org>, Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>, linux-pci@...r.kernel.org, "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org> Subject: Re: [PATCH 17/22] arm64: vdso: disable LTO On Wed, Jun 24, 2020 at 02:09:40PM -0700, Nick Desaulniers wrote: > On Wed, Jun 24, 2020 at 1:58 PM Nick Desaulniers > <ndesaulniers@...gle.com> wrote: > > > > On Wed, Jun 24, 2020 at 1:33 PM Sami Tolvanen <samitolvanen@...gle.com> wrote: > > > > > > Filter out CC_FLAGS_LTO for the vDSO. > > > > Just curious about this patch (and the following one for x86's vdso), > > do you happen to recall specifically what the issues with the vdso's > > are? > > + Andi (tangential, I actually have a bunch of tabs open with slides > from http://halobates.de/ right now) > 58edae3aac9f2 > 67424d5a22124 > $ git log -S DISABLE_LTO I think I did it originally because the vDSO linker step didn't do all the magic needed for gcc LTO. But it also doesn't seem to be very useful for just a few functions that don't have complex interactions, and somewhat risky for violating some assumptions. -Andi
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