diff options
| author | Peter Zijlstra <peterz@infradead.org> | 2025-09-23 13:04:09 +0200 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2025-10-29 10:29:57 +0100 |
| commit | 5578534e4b92350995a20068f2e6ea3186c62d7f (patch) | |
| tree | 4ba3ebd4c3553dc0b82bc583619aeb74e75b745e | |
| parent | 639214f65b1db87c6992eadf93079ff0d8768c2d (diff) | |
unwind: Simplify unwind_user_next_fp() alignment check
2^log_2(n) == n
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Link: https://patch.msgid.link/20250924080119.497867836@infradead.org
| -rw-r--r-- | kernel/unwind/user.c | 4 |
1 files changed, 1 insertions, 3 deletions
diff --git a/kernel/unwind/user.c b/kernel/unwind/user.c index 97a8415e3216..9dcde797b5d9 100644 --- a/kernel/unwind/user.c +++ b/kernel/unwind/user.c @@ -19,7 +19,6 @@ static int unwind_user_next_fp(struct unwind_user_state *state) { const struct unwind_user_frame *frame = &fp_frame; unsigned long cfa, fp, ra; - unsigned int shift; if (frame->use_fp) { if (state->fp < state->sp) @@ -37,8 +36,7 @@ static int unwind_user_next_fp(struct unwind_user_state *state) return -EINVAL; /* Make sure that the address is word aligned */ - shift = sizeof(long) == 4 ? 2 : 3; - if (cfa & ((1 << shift) - 1)) + if (cfa & (sizeof(long) - 1)) return -EINVAL; /* Find the Return Address (RA) */ |