linux-kernel - Re: [PATCH 1/2] perf build: Group the NO_SYSCALL

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Message-ID: <20200529201927.GC31795@kernel.org>
Date:   Fri, 29 May 2020 17:19:27 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Jiri Olsa <jolsa@...nel.org>, Namhyung Kim <namhyung@...nel.org>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Clark Williams <williams@...hat.com>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Adrian Hunter <adrian.hunter@...el.com>
Subject: Re: [PATCH 1/2] perf build: Group the NO_SYSCALL_TABLE logic

Em Fri, May 29, 2020 at 12:55:51PM -0300, Arnaldo Carvalho de Melo escreveu:
> From: Arnaldo Carvalho de Melo <acme@...hat.com>
> 
> To help in allowing to disable it from the make command line.
> 
> Cc: Adrian Hunter <adrian.hunter@...el.com>
> Cc: Jiri Olsa <jolsa@...nel.org>
> Cc: Namhyung Kim <namhyung@...nel.org>
> Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
> ---
>  tools/perf/Makefile.config | 23 +++++++++++++++--------
>  1 file changed, 15 insertions(+), 8 deletions(-)
> 
> diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
> index ae325f79e598..93fb7510a9a9 100644
> --- a/tools/perf/Makefile.config
> +++ b/tools/perf/Makefile.config
> @@ -23,12 +23,26 @@ include $(srctree)/tools/scripts/Makefile.arch
>  $(call detected_var,SRCARCH)
>  
>  NO_PERF_REGS := 1
> +
>  NO_SYSCALL_TABLE := 1
>  
> +ifeq ($(SRCARCH),x86)
> +  ifeq (${IS_64_BIT}, 1)
> +    NO_SYSCALL_TABLE := 0
> +  endif
> +else
> +  ifneq ($(SRCARCH),$(filter $(SRCARCH),powerpc arm64 s390))

The above should've been a ifeq, to see if SRCARCH is one of those,
detected in the cross build tests, fixed.

- Arnaldo

> +    NO_SYSCALL_TABLE := 0
> +  endif
> +endif
> +
> +ifneq ($(NO_SYSCALL_TABLE),1)
> +  CFLAGS += -DHAVE_SYSCALL_TABLE_SUPPORT
> +endif
> +
>  # Additional ARCH settings for ppc
>  ifeq ($(SRCARCH),powerpc)
>    NO_PERF_REGS := 0
> -  NO_SYSCALL_TABLE := 0
>    CFLAGS += -I$(OUTPUT)arch/powerpc/include/generated
>    LIBUNWIND_LIBS := -lunwind -lunwind-ppc64
>  endif
> @@ -37,7 +51,6 @@ endif
>  ifeq ($(SRCARCH),x86)
>    $(call detected,CONFIG_X86)
>    ifeq (${IS_64_BIT}, 1)
> -    NO_SYSCALL_TABLE := 0
>      CFLAGS += -DHAVE_ARCH_X86_64_SUPPORT -I$(OUTPUT)arch/x86/include/generated
>      ARCH_INCLUDE = ../../arch/x86/lib/memcpy_64.S ../../arch/x86/lib/memset_64.S
>      LIBUNWIND_LIBS = -lunwind-x86_64 -lunwind -llzma
> @@ -55,7 +68,6 @@ endif
>  
>  ifeq ($(SRCARCH),arm64)
>    NO_PERF_REGS := 0
> -  NO_SYSCALL_TABLE := 0
>    CFLAGS += -I$(OUTPUT)arch/arm64/include/generated
>    LIBUNWIND_LIBS = -lunwind -lunwind-aarch64
>  endif
> @@ -70,7 +82,6 @@ endif
>  
>  ifeq ($(ARCH),s390)
>    NO_PERF_REGS := 0
> -  NO_SYSCALL_TABLE := 0
>    CFLAGS += -fPIC -I$(OUTPUT)arch/s390/include/generated
>  endif
>  
> @@ -78,10 +89,6 @@ ifeq ($(NO_PERF_REGS),0)
>    $(call detected,CONFIG_PERF_REGS)
>  endif
>  
> -ifneq ($(NO_SYSCALL_TABLE),1)
> -  CFLAGS += -DHAVE_SYSCALL_TABLE_SUPPORT
> -endif
> -
>  # So far there's only x86 and arm libdw unwind support merged in perf.
>  # Disable it on all other architectures in case libdw unwind
>  # support is detected in system. Add supported architectures
> -- 
> 2.25.3
> 

-- 

- Arnaldo