linux-kernel - Re: [PATCH v5 9/9] tools: Remove feature-sync-compare-and-swap feature detection

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Date:   Mon, 9 Aug 2021 17:02:24 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Leo Yan <leo.yan@...aro.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Mike Leach <mike.leach@...aro.org>,
        Michael Petlan <mpetlan@...hat.com>,
        "Frank Ch. Eigler" <fche@...hat.com>,
        Song Liu <songliubraving@...com>, x86@...nel.org,
        Daniel Díaz <daniel.diaz@...aro.org>,
        Andrii Nakryiko <andriin@...com>,
        Alexei Starovoitov <ast@...nel.org>,
        Sedat Dilek <sedat.dilek@...il.com>,
        Andi Kleen <ak@...ux.intel.com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        coresight@...ts.linaro.org
Subject: Re: [PATCH v5 9/9] tools: Remove feature-sync-compare-and-swap
 feature detection

Em Mon, Aug 09, 2021 at 07:14:07PM +0800, Leo Yan escreveu:
> Since the __sync functions have been removed from perf, it's needless
> for perf tool to test the feature sync-compare-and-swap.
> 
> The feature test is not used by any other components, remove it.

Thanks, applied to perf/core.

- Arnaldo

 
> Signed-off-by: Leo Yan <leo.yan@...aro.org>
> ---
>  tools/build/Makefile.feature                     |  1 -
>  tools/build/feature/Makefile                     |  4 ----
>  tools/build/feature/test-all.c                   |  4 ----
>  tools/build/feature/test-sync-compare-and-swap.c | 15 ---------------
>  4 files changed, 24 deletions(-)
>  delete mode 100644 tools/build/feature/test-sync-compare-and-swap.c
> 
> diff --git a/tools/build/Makefile.feature b/tools/build/Makefile.feature
> index 04a8e3db8a54..3dd2f68366f9 100644
> --- a/tools/build/Makefile.feature
> +++ b/tools/build/Makefile.feature
> @@ -34,7 +34,6 @@ FEATURE_TESTS_BASIC :=                  \
>          dwarf_getlocations              \
>          eventfd                         \
>          fortify-source                  \
> -        sync-compare-and-swap           \
>          get_current_dir_name            \
>          gettid				\
>          glibc                           \
> diff --git a/tools/build/feature/Makefile b/tools/build/feature/Makefile
> index ec203e28407f..eff55d287db1 100644
> --- a/tools/build/feature/Makefile
> +++ b/tools/build/feature/Makefile
> @@ -9,7 +9,6 @@ FILES=                                          \
>           test-dwarf_getlocations.bin            \
>           test-eventfd.bin                       \
>           test-fortify-source.bin                \
> -         test-sync-compare-and-swap.bin         \
>           test-get_current_dir_name.bin          \
>           test-glibc.bin                         \
>           test-gtk2.bin                          \
> @@ -260,9 +259,6 @@ $(OUTPUT)test-libdw-dwarf-unwind.bin:
>  $(OUTPUT)test-libbabeltrace.bin:
>  	$(BUILD) # -lbabeltrace provided by $(FEATURE_CHECK_LDFLAGS-libbabeltrace)
>  
> -$(OUTPUT)test-sync-compare-and-swap.bin:
> -	$(BUILD)
> -
>  $(OUTPUT)test-compile-32.bin:
>  	$(CC) -m32 -o $@ test-compile.c
>  
> diff --git a/tools/build/feature/test-all.c b/tools/build/feature/test-all.c
> index 464873883396..920439527291 100644
> --- a/tools/build/feature/test-all.c
> +++ b/tools/build/feature/test-all.c
> @@ -106,10 +106,6 @@
>  # include "test-libdw-dwarf-unwind.c"
>  #undef main
>  
> -#define main main_test_sync_compare_and_swap
> -# include "test-sync-compare-and-swap.c"
> -#undef main
> -
>  #define main main_test_zlib
>  # include "test-zlib.c"
>  #undef main
> diff --git a/tools/build/feature/test-sync-compare-and-swap.c b/tools/build/feature/test-sync-compare-and-swap.c
> deleted file mode 100644
> index 3bc6b0768a53..000000000000
> --- a/tools/build/feature/test-sync-compare-and-swap.c
> +++ /dev/null
> @@ -1,15 +0,0 @@
> -// SPDX-License-Identifier: GPL-2.0
> -#include <stdint.h>
> -
> -volatile uint64_t x;
> -
> -int main(int argc, char *argv[])
> -{
> -	uint64_t old, new = argc;
> -
> -	(void)argv;
> -	do {
> -		old = __sync_val_compare_and_swap(&x, 0, 0);
> -	} while (!__sync_bool_compare_and_swap(&x, old, new));
> -	return old == new;
> -}
> -- 
> 2.25.1
> 

-- 

- Arnaldo