linux-kernel - [PATCH v3] x86: remove unused atomic_inc

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Message-Id: <20170526172900.91058-1-dvyukov@google.com>
Date:   Fri, 26 May 2017 19:29:00 +0200
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     mingo@...nel.org, x86@...nel.org
Cc:     Dmitry Vyukov <dvyukov@...gle.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v3] x86: remove unused atomic_inc_short()

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

Signed-off-by: Dmitry Vyukov <dvyukov@...gle.com>
Suggested-by: Mark Rutland <mark.rutland@....com>
Cc: Andrey Ryabinin <aryabinin@...tuozzo.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org
Cc: x86@...nel.org

--
Changes since v1:
 - change Suggested-by to Mark

Changes since v2:
 - rebase on tip/locking/core
 - drop atomic-instrumented.h changes
---
 arch/tile/lib/atomic_asm_32.S |  3 +--
 arch/x86/include/asm/atomic.h | 13 -------------
 2 files changed, 1 insertion(+), 15 deletions(-)

diff --git a/arch/tile/lib/atomic_asm_32.S b/arch/tile/lib/atomic_asm_32.S
index 1a70e6c0f259..94709ab41ed8 100644
--- 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.
diff --git a/arch/x86/include/asm/atomic.h b/arch/x86/include/asm/atomic.h
index caa5798c92f4..33380b871463 100644
--- a/arch/x86/include/asm/atomic.h
+++ b/arch/x86/include/asm/atomic.h
@@ -246,19 +246,6 @@ static __always_inline int __atomic_add_unless(atomic_t *v, int a, int u)
 	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 __always_inline short int atomic_inc_short(short int *v)
-{
-	asm(LOCK_PREFIX "addw $1, %0" : "+m" (*v));
-	return *v;
-}
-
 #ifdef CONFIG_X86_32
 # include <asm/atomic64_32.h>
 #else
-- 
2.13.0.219.gdb65acc882-goog