linux-kernel - [PATCH 04/11] btrfs: Mark btrfs_assertfail() _

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Date:   Fri,  7 Apr 2023 17:09:57 -0700
From:   Josh Poimboeuf <jpoimboe@...nel.org>
To:     x86@...nel.org
Cc:     linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Miroslav Benes <mbenes@...e.cz>, linux-btrfs@...r.kernel.org,
        Mark Rutland <mark.rutland@....com>,
        linux-scsi@...r.kernel.org, linux-hyperv@...r.kernel.org,
        Arnd Bergmann <arnd@...db.de>,
        "Guilherme G . Piccoli" <gpiccoli@...lia.com>,
        Michael Kelley <mikelley@...rosoft.com>,
        kernel test robot <lkp@...el.com>
Subject: [PATCH 04/11] 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>
Link: https://lore.kernel.org/oe-kbuild-all/202302210709.IlXfgMpX-lkp@intel.com/
Signed-off-by: Josh Poimboeuf <jpoimboe@...nel.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 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 4e89342dd8fb..a8714d62074e 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