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Date: Wed, 16 Feb 2022 17:37:13 -0700 From: Nathan Chancellor <nathan@...nel.org> To: Kees Cook <keescook@...omium.org> Cc: Jeff Dike <jdike@...toit.com>, Richard Weinberger <richard@....at>, Anton Ivanov <anton.ivanov@...bridgegreys.com>, Masahiro Yamada <masahiroy@...nel.org>, Nick Desaulniers <ndesaulniers@...gle.com>, David Gow <davidgow@...gle.com>, linux-um@...ts.infradead.org, linux-kbuild@...r.kernel.org, linux-kselftest@...r.kernel.org, kunit-dev@...glegroups.com, llvm@...ts.linux.dev, linux-kernel@...r.kernel.org, x86@...nel.org, linux-hardening@...r.kernel.org Subject: Re: [PATCH] um: Allow builds with Clang On Wed, Feb 16, 2022 at 04:28:43PM -0800, Kees Cook wrote: > Add x86-64 target for Clang+um and update user-offsets.c to use > Clang-friendly assembler, similar to the fix from commit cf0c3e68aa81 Clang-friendly assembly? > ("kbuild: fix asm-offset generation to work with clang"). > > This lets me run KUnit tests with Clang: > > $ ./tools/testing/kunit/kunit.py config --make_options LLVM=1 > ... > $ ./tools/testing/kunit/kunit.py run --make_options LLVM=1 > ... > > Cc: Jeff Dike <jdike@...toit.com> > Cc: Richard Weinberger <richard@....at> > Cc: Anton Ivanov <anton.ivanov@...bridgegreys.com> > Cc: Masahiro Yamada <masahiroy@...nel.org> > Cc: Nick Desaulniers <ndesaulniers@...gle.com> > Cc: Nathan Chancellor <nathan@...nel.org> > Cc: David Gow <davidgow@...gle.com> > Cc: linux-um@...ts.infradead.org > Cc: linux-kbuild@...r.kernel.org > Cc: linux-kselftest@...r.kernel.org > Cc: kunit-dev@...glegroups.com > Cc: llvm@...ts.linux.dev > Signed-off-by: Kees Cook <keescook@...omium.org> I am not super familiar with UML but this seems reasonable. Reviewed-by: Nathan Chancellor <nathan@...nel.org> One small nit below if you have to send a v2, not sure it is worth it otherwise. > --- > arch/x86/um/user-offsets.c | 4 ++-- > scripts/Makefile.clang | 1 + > 2 files changed, 3 insertions(+), 2 deletions(-) > > diff --git a/arch/x86/um/user-offsets.c b/arch/x86/um/user-offsets.c > index bae61554abcc..d9071827b515 100644 > --- a/arch/x86/um/user-offsets.c > +++ b/arch/x86/um/user-offsets.c > @@ -10,10 +10,10 @@ > #include <asm/types.h> > > #define DEFINE(sym, val) \ > - asm volatile("\n->" #sym " %0 " #val : : "i" (val)) > + asm volatile("\n.ascii \"->" #sym " %0 " #val "\"": : "i" (val)) > > #define DEFINE_LONGS(sym, val) \ > - asm volatile("\n->" #sym " %0 " #val : : "i" (val/sizeof(unsigned long))) > + asm volatile("\n.ascii \"->" #sym " %0 " #val "\"": : "i" (val/sizeof(unsigned long))) > > void foo(void) > { > diff --git a/scripts/Makefile.clang b/scripts/Makefile.clang > index 51fc23e2e9e5..857b23de51c6 100644 > --- a/scripts/Makefile.clang > +++ b/scripts/Makefile.clang > @@ -10,6 +10,7 @@ CLANG_TARGET_FLAGS_powerpc := powerpc64le-linux-gnu > CLANG_TARGET_FLAGS_riscv := riscv64-linux-gnu > CLANG_TARGET_FLAGS_s390 := s390x-linux-gnu > CLANG_TARGET_FLAGS_x86 := x86_64-linux-gnu > +CLANG_TARGET_FLAGS_um := x86_64-linux-gnu It might be nice to keep this in alphabetical order. > CLANG_TARGET_FLAGS := $(CLANG_TARGET_FLAGS_$(SRCARCH)) > > ifeq ($(CROSS_COMPILE),) > -- > 2.30.2 > >
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