[tip: locking/core] futex: Remove unused empty compat_exit_robust_list()

[tip-bot2 for Lukas Bulwahn]

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

Commit-ID:     932f8c64d38bb08f69c8c26a2216ba0c36c6daa8
Gitweb:        https://git.kernel.org/tip/932f8c64d38bb08f69c8c26a2216ba0c36c6daa8
Author:        Lukas Bulwahn <lukas.bulwahn@xxxxxxxxx>
AuthorDate:    Fri, 13 Nov 2020 18:20:12 +01:00
Committer:     Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitterDate: Sat, 14 Nov 2020 01:15:35 +01:00

futex: Remove unused empty compat_exit_robust_list()

Commit ba31c1a48538 ("futex: Move futex exit handling into futex code")
introduced compat_exit_robust_list() with a full-fledged implementation for
CONFIG_COMPAT, and an empty-body function for !CONFIG_COMPAT.

However, compat_exit_robust_list() is only used in futex_mm_release() under
#ifdef CONFIG_COMPAT.

Hence for !CONFIG_COMPAT, make CC=clang W=1 warns:

  kernel/futex.c:314:20:
    warning: unused function 'compat_exit_robust_list' [-Wunused-function]

There is no need to declare the unused empty function for !CONFIG_COMPAT.

Simply remove it.

Signed-off-by: Lukas Bulwahn <lukas.bulwahn@xxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Reviewed-by: Nathan Chancellor <natechancellor@xxxxxxxxx>
Link: https://lore.kernel.org/r/20201113172012.27221-1-lukas.bulwahn@xxxxxxxxx

---
 kernel/futex.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/kernel/futex.c b/kernel/futex.c
index ac32887..aee6ce2 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -310,8 +310,6 @@ static inline bool should_fail_futex(bool fshared)
 
 #ifdef CONFIG_COMPAT
 static void compat_exit_robust_list(struct task_struct *curr);
-#else
-static inline void compat_exit_robust_list(struct task_struct *curr) { }
 #endif
 
 /*