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| author | Josh Poimboeuf <jpoimboe@kernel.org> | 2024-06-26 09:02:00 +0300 |
|---|---|---|
| committer | Borislav Petkov (AMD) <bp@alien8.de> | 2024-06-28 16:23:38 +0300 |
| commit | 9142be9e6443fd641ca37f820efe00d9cd890eb1 (patch) | |
| tree | a1c5ddd81eab9c6cbb8d65ebbe40d73ddc5708ee /scripts/syscalltbl.sh | |
| parent | f2661062f16b2de5d7b6a5c42a9a5c96326b8454 (diff) | |
| download | linux-9142be9e6443fd641ca37f820efe00d9cd890eb1.tar.xz | |
x86/syscall: Mark exit[_group] syscall handlers __noreturn
The direct-call syscall dispatch function doesn't know that the exit()
and exit_group() syscall handlers don't return, so the call sites aren't
optimized accordingly.
Fix that by marking the exit syscall declarations __noreturn.
Fixes the following warnings:
vmlinux.o: warning: objtool: x64_sys_call+0x2804: __x64_sys_exit() is missing a __noreturn annotation
vmlinux.o: warning: objtool: ia32_sys_call+0x29b6: __ia32_sys_exit_group() is missing a __noreturn annotation
Fixes: 1e3ad78334a6 ("x86/syscall: Don't force use of indirect calls for system calls")
Closes: https://lkml.kernel.org/lkml/6dba9b32-db2c-4e6d-9500-7a08852f17a3@paulmck-laptop
Reported-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Tested-by: Paul E. McKenney <paulmck@kernel.org>
Link: https://lore.kernel.org/r/5d8882bc077d8eadcc7fd1740b56dfb781f12288.1719381528.git.jpoimboe@kernel.org
Diffstat (limited to 'scripts/syscalltbl.sh')
| -rwxr-xr-x | scripts/syscalltbl.sh | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/scripts/syscalltbl.sh b/scripts/syscalltbl.sh index 6abe143889ef..6a903b87a7c2 100755 --- a/scripts/syscalltbl.sh +++ b/scripts/syscalltbl.sh @@ -54,7 +54,7 @@ nxt=0 grep -E "^[0-9]+[[:space:]]+$abis" "$infile" | { - while read nr abi name native compat ; do + while read nr abi name native compat noreturn; do if [ $nxt -gt $nr ]; then echo "error: $infile: syscall table is not sorted or duplicates the same syscall number" >&2 @@ -66,7 +66,21 @@ grep -E "^[0-9]+[[:space:]]+$abis" "$infile" | { nxt=$((nxt + 1)) done - if [ -n "$compat" ]; then + if [ "$compat" = "-" ]; then + unset compat + fi + + if [ -n "$noreturn" ]; then + if [ "$noreturn" != "noreturn" ]; then + echo "error: $infile: invalid string \"$noreturn\" in 'noreturn' column" + exit 1 + fi + if [ -n "$compat" ]; then + echo "__SYSCALL_COMPAT_NORETURN($nr, $native, $compat)" + else + echo "__SYSCALL_NORETURN($nr, $native)" + fi + elif [ -n "$compat" ]; then echo "__SYSCALL_WITH_COMPAT($nr, $native, $compat)" elif [ -n "$native" ]; then echo "__SYSCALL($nr, $native)" |