Date: Mon, 12 Oct 2020 14:02:35 -0700 From: Kees Cook <keescook@...omium.org> To: Will Deacon <will@...nel.org> Cc: Sami Tolvanen <samitolvanen@...gle.com>, Masahiro Yamada <masahiroy@...nel.org>, Steven Rostedt <rostedt@...dmis.org>, Peter Zijlstra <peterz@...radead.org>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, "Paul E. McKenney" <paulmck@...nel.org>, Nick Desaulniers <ndesaulniers@...gle.com>, clang-built-linux@...glegroups.com, kernel-hardening@...ts.openwall.com, linux-arch@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org, x86@...nel.org Subject: Re: [PATCH v5 25/29] arm64: allow LTO_CLANG and THINLTO to be selected On Mon, Oct 12, 2020 at 09:51:09PM +0100, Will Deacon wrote: > On Mon, Oct 12, 2020 at 01:44:56PM -0700, Kees Cook wrote: > > On Mon, Oct 12, 2020 at 09:31:16AM +0100, Will Deacon wrote: > > > On Fri, Oct 09, 2020 at 09:13:34AM -0700, Sami Tolvanen wrote: > > > > Allow CONFIG_LTO_CLANG and CONFIG_THINLTO to be enabled. > > > > > > > > Signed-off-by: Sami Tolvanen <samitolvanen@...gle.com> > > > > Reviewed-by: Kees Cook <keescook@...omium.org> > > > > --- > > > > arch/arm64/Kconfig | 2 ++ > > > > 1 file changed, 2 insertions(+) > > > > > > > > diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig > > > > index ad522b021f35..7016d193864f 100644 > > > > --- a/arch/arm64/Kconfig > > > > +++ b/arch/arm64/Kconfig > > > > @@ -72,6 +72,8 @@ config ARM64 > > > > select ARCH_USE_SYM_ANNOTATIONS > > > > select ARCH_SUPPORTS_MEMORY_FAILURE > > > > select ARCH_SUPPORTS_SHADOW_CALL_STACK if CC_HAVE_SHADOW_CALL_STACK > > > > + select ARCH_SUPPORTS_LTO_CLANG > > > > + select ARCH_SUPPORTS_THINLTO > > > > > > Please don't enable this for arm64 until we have the dependency stuff sorted > > > out. I posted patches  for this before, but I think they should be part > > > of this series as they don't make sense on their own. > > > > Oh, hm. We've been trying to trim down this series, since it's already > > quite large. Why can't  land first? It would make this easier to deal > > with, IMO. > > I'm happy to handle  along with the LTO Kconfig change when the time > comes, if that helps. I just don't want to merge dead code! Okay, understood. Thanks! > > Will > > > >  https://git.kernel.org/pub/scm/linux/kernel/git/will/linux.git/log/?h=rwonce/read-barrier-depends -- Kees Cook
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