Date: Mon, 12 Oct 2020 13:44:56 -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 09:31:16AM +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. >  https://git.kernel.org/pub/scm/linux/kernel/git/will/linux.git/log/?h=rwonce/read-barrier-depends -- Kees Cook
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