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Date: Wed, 26 May 2021 11:24:42 -0000
From: "tip-bot2 for Mark Rutland" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Mark Rutland <mark.rutland@....com>,
Boqun Feng <boqun.feng@...il.com>,
Peter Zijlstra <peterz@...radead.org>,
Will Deacon <will@...nel.org>,
Yoshinori Sato <ysato@...rs.sourceforge.jp>, x86@...nel.org,
linux-kernel@...r.kernel.org
Subject: [tip: locking/core] locking/atomic: h8300: use asm-generic exclusively
The following commit has been merged into the locking/core branch of tip:
Commit-ID: c7178cdecdbef8321f418fac55f3afaca3bb4c96
Gitweb: https://git.kernel.org/tip/c7178cdecdbef8321f418fac55f3afaca3bb4c96
Author: Mark Rutland <mark.rutland@....com>
AuthorDate: Tue, 25 May 2021 15:02:02 +01:00
Committer: Peter Zijlstra <peterz@...radead.org>
CommitterDate: Wed, 26 May 2021 13:20:49 +02:00
locking/atomic: h8300: use asm-generic exclusively
As h8300's implementation of the atomics isn't using any arch-specific
functionality, and its implementation of cmpxchg only uses assembly to
non-atomically swap two elements in memory, we may as well use the
asm-generic atomic.h and cmpxchg.h, and avoid the duplicate code.
Signed-off-by: Mark Rutland <mark.rutland@....com>
Cc: Boqun Feng <boqun.feng@...il.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Will Deacon <will@...nel.org>
Cc: Yoshinori Sato <ysato@...rs.sourceforge.jp>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Link: https://lore.kernel.org/r/20210525140232.53872-4-mark.rutland@arm.com
---
arch/h8300/include/asm/Kbuild | 1 +-
arch/h8300/include/asm/atomic.h | 97 +-------------------------------
arch/h8300/include/asm/cmpxchg.h | 66 +---------------------
3 files changed, 1 insertion(+), 163 deletions(-)
delete mode 100644 arch/h8300/include/asm/atomic.h
delete mode 100644 arch/h8300/include/asm/cmpxchg.h
diff --git a/arch/h8300/include/asm/Kbuild b/arch/h8300/include/asm/Kbuild
index 60ee7f0..e23139c 100644
--- a/arch/h8300/include/asm/Kbuild
+++ b/arch/h8300/include/asm/Kbuild
@@ -1,5 +1,6 @@
# SPDX-License-Identifier: GPL-2.0
generic-y += asm-offsets.h
+generic-y += cmpxchg.h
generic-y += extable.h
generic-y += kvm_para.h
generic-y += mcs_spinlock.h
diff --git a/arch/h8300/include/asm/atomic.h b/arch/h8300/include/asm/atomic.h
deleted file mode 100644
index a990d15..0000000
--- a/arch/h8300/include/asm/atomic.h
+++ /dev/null
@@ -1,97 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef __ARCH_H8300_ATOMIC__
-#define __ARCH_H8300_ATOMIC__
-
-#include <linux/compiler.h>
-#include <linux/types.h>
-#include <asm/cmpxchg.h>
-#include <asm/irqflags.h>
-
-/*
- * Atomic operations that C can't guarantee us. Useful for
- * resource counting etc..
- */
-
-#define atomic_read(v) READ_ONCE((v)->counter)
-#define atomic_set(v, i) WRITE_ONCE(((v)->counter), (i))
-
-#define ATOMIC_OP_RETURN(op, c_op) \
-static inline int atomic_##op##_return(int i, atomic_t *v) \
-{ \
- h8300flags flags; \
- int ret; \
- \
- flags = arch_local_irq_save(); \
- ret = v->counter c_op i; \
- arch_local_irq_restore(flags); \
- return ret; \
-}
-
-#define ATOMIC_FETCH_OP(op, c_op) \
-static inline int atomic_fetch_##op(int i, atomic_t *v) \
-{ \
- h8300flags flags; \
- int ret; \
- \
- flags = arch_local_irq_save(); \
- ret = v->counter; \
- v->counter c_op i; \
- arch_local_irq_restore(flags); \
- return ret; \
-}
-
-#define ATOMIC_OP(op, c_op) \
-static inline void atomic_##op(int i, atomic_t *v) \
-{ \
- h8300flags flags; \
- \
- flags = arch_local_irq_save(); \
- v->counter c_op i; \
- arch_local_irq_restore(flags); \
-}
-
-ATOMIC_OP_RETURN(add, +=)
-ATOMIC_OP_RETURN(sub, -=)
-
-#define ATOMIC_OPS(op, c_op) \
- ATOMIC_OP(op, c_op) \
- ATOMIC_FETCH_OP(op, c_op)
-
-ATOMIC_OPS(and, &=)
-ATOMIC_OPS(or, |=)
-ATOMIC_OPS(xor, ^=)
-ATOMIC_OPS(add, +=)
-ATOMIC_OPS(sub, -=)
-
-#undef ATOMIC_OPS
-#undef ATOMIC_OP_RETURN
-#undef ATOMIC_OP
-
-static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
-{
- int ret;
- h8300flags flags;
-
- flags = arch_local_irq_save();
- ret = v->counter;
- if (likely(ret == old))
- v->counter = new;
- arch_local_irq_restore(flags);
- return ret;
-}
-
-static inline int atomic_fetch_add_unless(atomic_t *v, int a, int u)
-{
- int ret;
- h8300flags flags;
-
- flags = arch_local_irq_save();
- ret = v->counter;
- if (ret != u)
- v->counter += a;
- arch_local_irq_restore(flags);
- return ret;
-}
-#define atomic_fetch_add_unless atomic_fetch_add_unless
-
-#endif /* __ARCH_H8300_ATOMIC __ */
diff --git a/arch/h8300/include/asm/cmpxchg.h b/arch/h8300/include/asm/cmpxchg.h
deleted file mode 100644
index c64bb38..0000000
--- a/arch/h8300/include/asm/cmpxchg.h
+++ /dev/null
@@ -1,66 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef __ARCH_H8300_CMPXCHG__
-#define __ARCH_H8300_CMPXCHG__
-
-#include <linux/irqflags.h>
-
-#define xchg(ptr, x) \
- ((__typeof__(*(ptr)))__xchg((unsigned long)(x), (ptr), \
- sizeof(*(ptr))))
-
-struct __xchg_dummy { unsigned long a[100]; };
-#define __xg(x) ((volatile struct __xchg_dummy *)(x))
-
-static inline unsigned long __xchg(unsigned long x,
- volatile void *ptr, int size)
-{
- unsigned long tmp, flags;
-
- local_irq_save(flags);
-
- switch (size) {
- case 1:
- __asm__ __volatile__
- ("mov.b %2,%0\n\t"
- "mov.b %1,%2"
- : "=&r" (tmp) : "r" (x), "m" (*__xg(ptr)));
- break;
- case 2:
- __asm__ __volatile__
- ("mov.w %2,%0\n\t"
- "mov.w %1,%2"
- : "=&r" (tmp) : "r" (x), "m" (*__xg(ptr)));
- break;
- case 4:
- __asm__ __volatile__
- ("mov.l %2,%0\n\t"
- "mov.l %1,%2"
- : "=&r" (tmp) : "r" (x), "m" (*__xg(ptr)));
- break;
- default:
- tmp = 0;
- }
- local_irq_restore(flags);
- return tmp;
-}
-
-#include <asm-generic/cmpxchg-local.h>
-
-/*
- * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
- * them available.
- */
-#define cmpxchg_local(ptr, o, n) \
- ((__typeof__(*(ptr)))__cmpxchg_local_generic((ptr), \
- (unsigned long)(o), \
- (unsigned long)(n), \
- sizeof(*(ptr))))
-#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
-
-#ifndef CONFIG_SMP
-#include <asm-generic/cmpxchg.h>
-#endif
-
-#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
-
-#endif /* __ARCH_H8300_CMPXCHG__ */
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