[PATCH v2 08/11] btrfs: Mark btrfs_assertfail() __noreturn

From: Josh Poimboeuf
Date: Wed Apr 12 2023 - 19:50:21 EST


Fixes a bunch of warnings including:

vmlinux.o: warning: objtool: select_reloc_root+0x314: unreachable instruction
vmlinux.o: warning: objtool: finish_inode_if_needed+0x15b1: unreachable instruction
vmlinux.o: warning: objtool: get_bio_sector_nr+0x259: unreachable instruction
vmlinux.o: warning: objtool: raid_wait_read_end_io+0xc26: unreachable instruction
vmlinux.o: warning: objtool: raid56_parity_alloc_scrub_rbio+0x37b: unreachable instruction
...

Reported-by: kernel test robot <lkp@xxxxxxxxx>
Link: https://lore.kernel.org/oe-kbuild-all/202302210709.IlXfgMpX-lkp@xxxxxxxxx/
Signed-off-by: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
---
fs/btrfs/messages.c | 2 +-
fs/btrfs/messages.h | 2 +-
tools/objtool/check.c | 1 +
3 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/fs/btrfs/messages.c b/fs/btrfs/messages.c
index fde5aaa6e7c9..310a05cf95ef 100644
--- a/fs/btrfs/messages.c
+++ b/fs/btrfs/messages.c
@@ -253,7 +253,7 @@ void __cold _btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt,
#endif

#ifdef CONFIG_BTRFS_ASSERT
-void __cold btrfs_assertfail(const char *expr, const char *file, int line)
+void __cold __noreturn btrfs_assertfail(const char *expr, const char *file, int line)
{
pr_err("assertion failed: %s, in %s:%d\n", expr, file, line);
BUG();
diff --git a/fs/btrfs/messages.h b/fs/btrfs/messages.h
index 8c516ee58ff9..ac2d1982ba3d 100644
--- a/fs/btrfs/messages.h
+++ b/fs/btrfs/messages.h
@@ -160,7 +160,7 @@ do { \
} while (0)

#ifdef CONFIG_BTRFS_ASSERT
-void __cold btrfs_assertfail(const char *expr, const char *file, int line);
+void __cold __noreturn btrfs_assertfail(const char *expr, const char *file, int line);

#define ASSERT(expr) \
(likely(expr) ? (void)0 : btrfs_assertfail(#expr, __FILE__, __LINE__))
diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index 94c16436d990..0b3522d66ddf 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -204,6 +204,7 @@ static bool __dead_end_function(struct objtool_file *file, struct symbol *func,
"__ubsan_handle_builtin_unreachable",
"arch_call_rest_init",
"arch_cpu_idle_dead",
+ "btrfs_assertfail",
"cpu_bringup_and_idle",
"cpu_startup_entry",
"do_exit",
--
2.39.2