linux-kernel - [PATCH 3.16 50/63] locking/x86: Remove the unused atomic_inc

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Message-ID: <lsq.1578512578.228195979@decadent.org.uk>
Date:   Wed, 08 Jan 2020 19:43:48 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Ingo Molnar" <mingo@...nel.org>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        "Andrey Ryabinin" <aryabinin@...tuozzo.com>,
        "Mark Rutland" <mark.rutland@....com>,
        "Dmitry Vyukov" <dvyukov@...gle.com>,
        "Linus Torvalds" <torvalds@...ux-foundation.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        "Thomas Gleixner" <tglx@...utronix.de>
Subject: [PATCH 3.16 50/63] locking/x86: Remove the unused atomic_inc_short()
 methd

3.16.81-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Dmitry Vyukov <dvyukov@...gle.com>

commit 31b35f6b4d5285a311e10753f4eb17304326b211 upstream.

It is completely unused and implemented only on x86.
Remove it.

Suggested-by: Mark Rutland <mark.rutland@....com>
Signed-off-by: Dmitry Vyukov <dvyukov@...gle.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Andrey Ryabinin <aryabinin@...tuozzo.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Link: http://lkml.kernel.org/r/20170526172900.91058-1-dvyukov@google.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
[bwh: Backported to 3.16 because this function is broken after
 "x86/atomic: Fix smp_mb__{before,after}_atomic()":
 - Adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 arch/tile/lib/atomic_asm_32.S |  3 +--
 arch/x86/include/asm/atomic.h | 13 -------------
 2 files changed, 1 insertion(+), 15 deletions(-)

--- a/arch/tile/lib/atomic_asm_32.S
+++ b/arch/tile/lib/atomic_asm_32.S
@@ -24,8 +24,7 @@
  * has an opportunity to return -EFAULT to the user if needed.
  * The 64-bit routines just return a "long long" with the value,
  * since they are only used from kernel space and don't expect to fault.
- * Support for 16-bit ops is included in the framework but we don't provide
- * any (x86_64 has an atomic_inc_short(), so we might want to some day).
+ * Support for 16-bit ops is included in the framework but we don't provide any.
  *
  * Note that the caller is advised to issue a suitable L1 or L2
  * prefetch on the address being manipulated to avoid extra stalls.
--- a/arch/x86/include/asm/atomic.h
+++ b/arch/x86/include/asm/atomic.h
@@ -205,19 +205,6 @@ static inline int __atomic_add_unless(at
 	return c;
 }
 
-/**
- * atomic_inc_short - increment of a short integer
- * @v: pointer to type int
- *
- * Atomically adds 1 to @v
- * Returns the new value of @u
- */
-static inline short int atomic_inc_short(short int *v)
-{
-	asm(LOCK_PREFIX "addw $1, %0" : "+m" (*v));
-	return *v;
-}
-
 /* These are x86-specific, used by some header files */
 #define atomic_clear_mask(mask, addr)				\
 	asm volatile(LOCK_PREFIX "andl %0,%1"			\