[PATCH RFC v3 1/8] syscalls: Make --abis parsing more robust

[André Almeida]

Some archs Makefile have the something like this as the rule for making the
syscall files:

  cmd_systbl = $(CONFIG_SHELL) $(systbl) --abis common,$* $< $@

The $* symbol is evaluated to the variable found at $(uapi)/unistd-%.h,
where % is 32 or 64, resulting in e.g. `--abis common,32`. Sometimes the
rule for the file won't have a %, resulting in a trailing comma e.g.
`--abis common,`.

Currently this input is transformed into (common|). This is problematic
because grep will then match any ABI because of the trailing `|`. Make the
syscalls scripts more robust by removing any trailing comma.

Signed-off-by: André Almeida <andrealmeid@xxxxxxxxxx>
---
 scripts/syscallhdr.sh | 2 +-
 scripts/syscalltbl.sh | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/scripts/syscallhdr.sh b/scripts/syscallhdr.sh
index 22e34cd46b9b..bad1ab606a0f 100755
--- a/scripts/syscallhdr.sh
+++ b/scripts/syscallhdr.sh
@@ -39,7 +39,7 @@ while [ $# -gt 0 ]
 do
 	case $1 in
 	--abis)
-		abis=$(echo "($2)" | tr ',' '|')
+		abis="($(echo "${2%,}" | tr ',' '|'))"
 		shift 2;;
 	--emit-nr)
 		emit_nr=1
diff --git a/scripts/syscalltbl.sh b/scripts/syscalltbl.sh
index 6a903b87a7c2..c4b1f85c2dd6 100755
--- a/scripts/syscalltbl.sh
+++ b/scripts/syscalltbl.sh
@@ -33,7 +33,7 @@ while [ $# -gt 0 ]
 do
 	case $1 in
 	--abis)
-		abis=$(echo "($2)" | tr ',' '|')
+		abis="($(echo "${2%,}" | tr ',' '|'))"
 		shift 2;;
 	-*)
 		echo "$1: unknown option" >&2

-- 
2.55.0