linux-kernel - [tip: objtool/core] btrfs: Mark btrfs_assertfail() _

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Date:   Mon, 17 Apr 2023 10:46:46 -0000
From:   "tip-bot2 for Josh Poimboeuf" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     kernel test robot <lkp@...el.com>,
        Josh Poimboeuf <jpoimboe@...nel.org>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: objtool/core] btrfs: Mark btrfs_assertfail() __noreturn

The following commit has been merged into the objtool/core branch of tip:

Commit-ID:     09c5ae30d007514a1be870fa5873ad55c3319f3a
Gitweb:        https://git.kernel.org/tip/09c5ae30d007514a1be870fa5873ad55c3319f3a
Author:        Josh Poimboeuf <jpoimboe@...nel.org>
AuthorDate:    Wed, 12 Apr 2023 16:49:38 -07:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Fri, 14 Apr 2023 17:31:26 +02:00

btrfs: Mark btrfs_assertfail() __noreturn

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@...el.com>
Signed-off-by: Josh Poimboeuf <jpoimboe@...nel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Link: https://lore.kernel.org/r/960bd9c0c9e3cfc409ba9c35a17644b11b832956.1681342859.git.jpoimboe@kernel.org
---
 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 fde5aaa..310a05c 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 8c516ee..ac2d198 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 ae0c942..ceb9848 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",