linux-kernel - Re: [PATCH] selftests, x86: fix how check

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Message-ID: <8e88488b-1666-ce1b-6d79-7c6758672ac0@collabora.com>
Date:   Fri, 25 Feb 2022 18:49:37 +0000
From:   Guillaume Tucker <guillaume.tucker@...labora.com>
To:     Shuah Khan <shuah@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Borislav Petkov <bp@...e.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        kernel@...labora.com, linux-mm@...ck.org,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] selftests, x86: fix how check_cc.sh is being invoked

On 25/02/2022 13:15, Guillaume Tucker wrote:
> Add quotes around $(CC) when calling check_cc.sh from a Makefile to
> pass the value as a single argument to the script even if it has
> several words such as "ccache gcc".  Conversely, remove quotes in
> check_cc.sh when calling $CC to make it a command with potentially
> several arguments again.
> 
> Fixes: e9886ace222e ("selftests, x86: Rework x86 target architecture detection")
> Tested-by: "kernelci.org bot" <bot@...nelci.org>
> Signed-off-by: Guillaume Tucker <guillaume.tucker@...labora.com>
> ---
>  tools/testing/selftests/vm/Makefile     | 6 +++---
>  tools/testing/selftests/x86/Makefile    | 6 +++---
>  tools/testing/selftests/x86/check_cc.sh | 2 +-
>  3 files changed, 7 insertions(+), 7 deletions(-)
> 
> diff --git a/tools/testing/selftests/vm/Makefile b/tools/testing/selftests/vm/Makefile
> index 1607322a112c..d934f026ebb5 100644
> --- a/tools/testing/selftests/vm/Makefile
> +++ b/tools/testing/selftests/vm/Makefile
> @@ -49,9 +49,9 @@ TEST_GEN_FILES += split_huge_page_test
>  TEST_GEN_FILES += ksm_tests
>  
>  ifeq ($(MACHINE),x86_64)
> -CAN_BUILD_I386 := $(shell ./../x86/check_cc.sh $(CC) ../x86/trivial_32bit_program.c -m32)
> -CAN_BUILD_X86_64 := $(shell ./../x86/check_cc.sh $(CC) ../x86/trivial_64bit_program.c)
> -CAN_BUILD_WITH_NOPIE := $(shell ./../x86/check_cc.sh $(CC) ../x86/trivial_program.c -no-pie)
> +CAN_BUILD_I386 := $(shell ./../x86/check_cc.sh "$(CC)" ../x86/trivial_32bit_program.c -m32)
> +CAN_BUILD_X86_64 := $(shell ./../x86/check_cc.sh "$(CC)" ../x86/trivial_64bit_program.c)
> +CAN_BUILD_WITH_NOPIE := $(shell ./../x86/check_cc.sh "$(CC)" ../x86/trivial_program.c -no-pie)
>  
>  TARGETS := protection_keys
>  BINARIES_32 := $(TARGETS:%=%_32)
> diff --git a/tools/testing/selftests/x86/Makefile b/tools/testing/selftests/x86/Makefile
> index 8a1f62ab3c8e..53df7d3893d3 100644
> --- a/tools/testing/selftests/x86/Makefile
> +++ b/tools/testing/selftests/x86/Makefile
> @@ -6,9 +6,9 @@ include ../lib.mk
>  .PHONY: all all_32 all_64 warn_32bit_failure clean
>  
>  UNAME_M := $(shell uname -m)
> -CAN_BUILD_I386 := $(shell ./check_cc.sh $(CC) trivial_32bit_program.c -m32)
> -CAN_BUILD_X86_64 := $(shell ./check_cc.sh $(CC) trivial_64bit_program.c)
> -CAN_BUILD_WITH_NOPIE := $(shell ./check_cc.sh $(CC) trivial_program.c -no-pie)
> +CAN_BUILD_I386 := $(shell ./check_cc.sh "$(CC)" trivial_32bit_program.c -m32)
> +CAN_BUILD_X86_64 := $(shell ./check_cc.sh "$(CC)" trivial_64bit_program.c)
> +CAN_BUILD_WITH_NOPIE := $(shell ./check_cc.sh "$(CC)" trivial_program.c -no-pie)
>  
>  TARGETS_C_BOTHBITS := single_step_syscall sysret_ss_attrs syscall_nt test_mremap_vdso \
>  			check_initial_reg_state sigreturn iopl ioperm \
> diff --git a/tools/testing/selftests/x86/check_cc.sh b/tools/testing/selftests/x86/check_cc.sh
> index 3e2089c8cf54..aff2c15018b5 100755
> --- a/tools/testing/selftests/x86/check_cc.sh
> +++ b/tools/testing/selftests/x86/check_cc.sh
> @@ -7,7 +7,7 @@ CC="$1"
>  TESTPROG="$2"
>  shift 2
>  
> -if "$CC" -o /dev/null "$TESTPROG" -O0 "$@" 2>/dev/null; then
> +if $CC -o /dev/null "$TESTPROG" -O0 "$@" 2>/dev/null; then
>      echo 1
>  else
>      echo 0

I see the change in check_cc.sh is already covered by Usama's patch:

  selftests/x86: Add validity check and allow field splitting

-if "$CC" -o /dev/null "$TESTPROG" -O0 "$@" 2>/dev/null; then
+if [ -n "$CC" ] && $CC -o /dev/null "$TESTPROG" -O0 "$@" 2>/dev/null; then


However, the rest of this patch in the Makefiles still needs to
be applied.  Let me know if I should rebase it on top of Usama's.

Thanks,
Guillaume