linux-kernel - Re: [PATCH] perf arm64: Fix include path for asm-generic/unistd.h

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Date:   Tue, 7 Aug 2018 10:20:57 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Kim Phillips <kim.phillips@....com>
Cc:     Arnaldo Carvalho de Melo <acme@...hat.com>,
        Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Hendrik Brueckner <brueckner@...ux.vnet.ibm.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Namhyung Kim <namhyung@...nel.org>,
        Thomas Richter <tmricht@...ux.vnet.ibm.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf arm64: Fix include path for asm-generic/unistd.h

Em Mon, Aug 06, 2018 at 05:28:00PM -0500, Kim Phillips escreveu:
> The new syscall table support for arm64 mistakenly used the system's
> asm-generic/unistd.h file when processing the
> tools/arch/arm64/include/uapi/asm/unistd.h file's include directive:
> 
> 	#include <asm-generic/unistd.h>
> 
> See "Committer notes" section of commit 2b5882435606 "perf arm64:
> Generate system call table from asm/unistd.h" for more details.
> 
> This patch removes the committer's temporary workaround, and instructs
> the host compiler to search the build tree's include path for the right
> copy of the unistd.h file, instead of the one on the system's
> /usr/include path.
> 
> It thus fixes the committer's test that cross-builds an arm64 perf
> on an x86 platform running Ubuntu 14.04.5 LTS with an old toolchain:
> 
> $ tools/perf/arch/arm64/entry/syscalls/mksyscalltbl /gcc-linaro-5.4.1-2017.05-x86_64_aarch64-linux-gnu/bin/aarch64-linux-gnu-gcc gcc `pwd`/tools tools/arch/arm64/include/uapi/asm/unistd.h | grep bpf
> 	[280] = "bpf",
> 
> Cc: Hendrik Brueckner <brueckner@...ux.ibm.com>
> Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
> Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
> Cc: Jiri Olsa <jolsa@...hat.com>
> Cc: Michael Ellerman <mpe@...erman.id.au>
> Cc: Namhyung Kim <namhyung@...nel.org>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>
> Cc: Thomas Richter <tmricht@...ux.vnet.ibm.com>
> Fixes: 2b5882435606 ("perf arm64: Generate system call table from asm/unistd.h")
> Signed-off-by: Kim Phillips <kim.phillips@....com>
> ---
> Hi, sorry for late response - was on vacation.  I was able to reproduce
> and fix by adding this -I to the $hostcc line.  Please test, and let me
> know if this is an acceptable fix.

Looks better than what I did, that indeed was a stopgap solution till
something better came along.

There are newer toolchains in my container collection to cross build
arm64/arm:

  17 debian:experimental-x-arm64   : Ok   aarch64-linux-gnu-gcc (Debian 7.3.0-15) 7.3.0
  46 ubuntu:16.04-x-arm            : Ok   arm-linux-gnueabihf-gcc (Ubuntu/Linaro 5.4.0-6ubuntu1~16.04.9) 5.4.0 20160609
  47 ubuntu:16.04-x-arm64          : Ok   aarch64-linux-gnu-gcc (Ubuntu/Linaro 5.4.0-6ubuntu1~16.04.9) 5.4.0 20160609


I think its time to add ubuntu:18.04-x- variants, to get a more recent
toolchain on ubuntu, will do.

Anyway, I'll repeat the tests after applying your patch,

- Arnaldo
 
>  tools/perf/arch/arm64/Makefile                    | 5 +++--
>  tools/perf/arch/arm64/entry/syscalls/mksyscalltbl | 6 +++---
>  2 files changed, 6 insertions(+), 5 deletions(-)
> 
> diff --git a/tools/perf/arch/arm64/Makefile b/tools/perf/arch/arm64/Makefile
> index f013b115dc86..dbef716a1913 100644
> --- a/tools/perf/arch/arm64/Makefile
> +++ b/tools/perf/arch/arm64/Makefile
> @@ -11,7 +11,8 @@ PERF_HAVE_ARCH_REGS_QUERY_REGISTER_OFFSET := 1
>  
>  out    := $(OUTPUT)arch/arm64/include/generated/asm
>  header := $(out)/syscalls.c
> -sysdef := $(srctree)/tools/include/uapi/asm-generic/unistd.h
> +incpath := $(srctree)/tools
> +sysdef := $(srctree)/tools/arch/arm64/include/uapi/asm/unistd.h
>  sysprf := $(srctree)/tools/perf/arch/arm64/entry/syscalls/
>  systbl := $(sysprf)/mksyscalltbl
>  
> @@ -19,7 +20,7 @@ systbl := $(sysprf)/mksyscalltbl
>  _dummy := $(shell [ -d '$(out)' ] || mkdir -p '$(out)')
>  
>  $(header): $(sysdef) $(systbl)
> -	$(Q)$(SHELL) '$(systbl)' '$(CC)' '$(HOSTCC)' $(sysdef) > $@
> +	$(Q)$(SHELL) '$(systbl)' '$(CC)' '$(HOSTCC)' $(incpath) $(sysdef) > $@
>  
>  clean::
>  	$(call QUIET_CLEAN, arm64) $(RM) $(header)
> diff --git a/tools/perf/arch/arm64/entry/syscalls/mksyscalltbl b/tools/perf/arch/arm64/entry/syscalls/mksyscalltbl
> index 52e197317d3e..2dbb8cade048 100755
> --- a/tools/perf/arch/arm64/entry/syscalls/mksyscalltbl
> +++ b/tools/perf/arch/arm64/entry/syscalls/mksyscalltbl
> @@ -11,7 +11,8 @@
>  
>  gcc=$1
>  hostcc=$2
> -input=$3
> +incpath=$3
> +input=$4
>  
>  if ! test -r $input; then
>  	echo "Could not read input file" >&2
> @@ -28,7 +29,6 @@ create_table_from_c()
>  
>  	cat <<-_EoHEADER
>  		#include <stdio.h>
> -		#define __ARCH_WANT_RENAMEAT
>  		#include "$input"
>  		int main(int argc, char *argv[])
>  		{
> @@ -42,7 +42,7 @@ create_table_from_c()
>  	printf "%s\n" "	printf(\"#define SYSCALLTBL_ARM64_MAX_ID %d\\n\", __NR_$last_sc);"
>  	printf "}\n"
>  
> -	} | $hostcc -o $create_table_exe -x c -
> +	} | $hostcc -I $incpath/include/uapi -o $create_table_exe -x c -
>  
>  	$create_table_exe
>  
> -- 
> 2.17.1