From 2eec5f004205be12b5a35628236b593fe1d1cbd5 Mon Sep 17 00:00:00 2001 From: Anders Roxell Date: Tue, 29 Jan 2019 14:01:46 +0100 Subject: [PATCH] btrfs: let the assertion expression compile in all configs MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit A compiler warning (in a patch in development) pointed to a variable that was used only inside and ASSERT: u64 root_objectid = root->root_key.objectid; ASSERT(root_objectid == ...); fs/btrfs/relocation.c: In function ‘insert_dirty_subv’: fs/btrfs/relocation.c:2138:6: warning: unused variable ‘root_objectid’ [-Wunused-variable] u64 root_objectid = root->root_key.objectid; ^~~~~~~~~~~~~ When CONFIG_BRTFS_ASSERT isn't enabled, variable root_objectid isn't used. Rework the assertion helper by adding a runtime check instead of the '#ifdef CONFIG_BTRFS_ASSERT #else ...", so the compiler sees the condition being passed into an inline function after preprocessing. Signed-off-by: Anders Roxell Reviewed-by: David Sterba [ update changelog ] Signed-off-by: David Sterba --- fs/btrfs/ctree.h | 13 +++++-------- 1 file changed, 5 insertions(+), 8 deletions(-) diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index 007b0e81992a..2399f56d8a54 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -3518,21 +3518,18 @@ do { \ rcu_read_unlock(); \ } while (0) -#ifdef CONFIG_BTRFS_ASSERT - __cold static inline void assfail(const char *expr, const char *file, int line) { - pr_err("assertion failed: %s, file: %s, line: %d\n", - expr, file, line); - BUG(); + if (IS_ENABLED(CONFIG_BTRFS_ASSERT)) { + pr_err("assertion failed: %s, file: %s, line: %d\n", + expr, file, line); + BUG(); + } } #define ASSERT(expr) \ (likely(expr) ? (void)0 : assfail(#expr, __FILE__, __LINE__)) -#else -#define ASSERT(expr) ((void)0) -#endif /* * Use that for functions that are conditionally exported for sanity tests but