linux-kernel - [PATCH v2 3/3] perf LoongArch: Simplify mksyscalltbl

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Date:   Mon, 29 May 2023 10:23:14 +0800
From:   Tiezhu Yang <yangtiezhu@...ngson.cn>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>
Cc:     Hans-Peter Nilsson <hp@...s.com>,
        Alexander Kapshuk <alexander.kapshuk@...il.com>,
        Leo Yan <leo.yan@...aro.org>, linux-perf-users@...r.kernel.org,
        linux-kernel@...r.kernel.org, loongarch@...ts.linux.dev,
        loongson-kernel@...ts.loongnix.cn
Subject: [PATCH v2 3/3] perf LoongArch: Simplify mksyscalltbl

In order to print the numerical entries of the syscall table,
there is no need to call the host compiler to build and then
run a program, this can be done directly by the shell script.

This is similar with commit 9854e7ad35fe ("perf arm64: Simplify
mksyscalltbl"). For now, the mksyscalltbl file of LoongArch is
almost same with arm64.

Signed-off-by: Tiezhu Yang <yangtiezhu@...ngson.cn>
Reviewed-by: Leo Yan <leo.yan@...aro.org>
---
 .../arch/loongarch/entry/syscalls/mksyscalltbl     | 36 ++++++----------------
 1 file changed, 10 insertions(+), 26 deletions(-)

diff --git a/tools/perf/arch/loongarch/entry/syscalls/mksyscalltbl b/tools/perf/arch/loongarch/entry/syscalls/mksyscalltbl
index c52156f..8df7b0b 100755
--- a/tools/perf/arch/loongarch/entry/syscalls/mksyscalltbl
+++ b/tools/perf/arch/loongarch/entry/syscalls/mksyscalltbl
@@ -18,44 +18,28 @@ if ! test -r $input; then
 	exit 1
 fi
 
-create_table_from_c()
+create_sc_table()
 {
 	local sc nr last_sc
 
-	create_table_exe=`mktemp ${TMPDIR:-/tmp}/create-table-XXXXXX`
-
-	{
-
-	cat <<-_EoHEADER
-		#include <stdio.h>
-		#include "$input"
-		int main(int argc, char *argv[])
-		{
-	_EoHEADER
-
 	while read sc nr; do
-		printf "%s\n" "	printf(\"\\t[%d] = \\\"$sc\\\",\\n\", $nr);"
-		last_sc=$nr
+		printf "%s\n" "	[$nr] = \"$sc\","
+		last_sc=$sc
 	done
 
-	printf "%s\n" "	printf(\"#define SYSCALLTBL_LOONGARCH_MAX_ID %d\\n\", $last_sc);"
-	printf "}\n"
-
-	} | $hostcc -I $incpath/include/uapi -o $create_table_exe -x c -
-
-	$create_table_exe
-
-	rm -f $create_table_exe
+	printf "%s\n" "#define SYSCALLTBL_LOONGARCH_MAX_ID __NR_$last_sc"
 }
 
 create_table()
 {
+	echo "#include \"$input\""
 	echo "static const char *syscalltbl_loongarch[] = {"
-	create_table_from_c
+	create_sc_table
 	echo "};"
 }
 
-$gcc -E -dM -x c  -I $incpath/include/uapi $input	       \
-	|sed -ne 's/^#define __NR_//p' \
-	|sort -t' ' -k2 -n \
+$gcc -E -dM -x c -I $incpath/include/uapi $input \
+	|awk '$2 ~ "__NR" && $3 !~ "__NR3264_" {
+		sub("^#define __NR(3264)?_", "");
+		print | "sort -k2 -n"}' \
 	|create_table
-- 
2.1.0