Release 4.18 arch/x86/include/asm/atomic.h
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_ATOMIC_H
#define _ASM_X86_ATOMIC_H
#include <linux/compiler.h>
#include <linux/types.h>
#include <asm/alternative.h>
#include <asm/cmpxchg.h>
#include <asm/rmwcc.h>
#include <asm/barrier.h>
/*
* Atomic operations that C can't guarantee us. Useful for
* resource counting etc..
*/
#define ATOMIC_INIT(i) { (i) }
/**
* arch_atomic_read - read atomic variable
* @v: pointer of type atomic_t
*
* Atomically reads the value of @v.
*/
static __always_inline int arch_atomic_read(const atomic_t *v)
{
/*
* Note for KASAN: we deliberately don't use READ_ONCE_NOCHECK() here,
* it's non-inlined function that increases binary size and stack usage.
*/
return READ_ONCE((v)->counter);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Brian Gerst | 15 | 65.22% | 1 | 14.29% |
| Anton Blanchard | 2 | 8.70% | 1 | 14.29% |
| Dmitriy Vyukov | 2 | 8.70% | 2 | 28.57% |
| Pranith Kumar | 2 | 8.70% | 1 | 14.29% |
| Peter Zijlstra | 1 | 4.35% | 1 | 14.29% |
| Denys Vlasenko | 1 | 4.35% | 1 | 14.29% |
| Total | 23 | 100.00% | 7 | 100.00% |
/**
* arch_atomic_set - set atomic variable
* @v: pointer of type atomic_t
* @i: required value
*
* Atomically sets the value of @v to @i.
*/
static __always_inline void arch_atomic_set(atomic_t *v, int i)
{
WRITE_ONCE(v->counter, i);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Brian Gerst | 17 | 73.91% | 1 | 25.00% |
| Peter Zijlstra | 4 | 17.39% | 1 | 25.00% |
| Dmitriy Vyukov | 1 | 4.35% | 1 | 25.00% |
| Denys Vlasenko | 1 | 4.35% | 1 | 25.00% |
| Total | 23 | 100.00% | 4 | 100.00% |
/**
* arch_atomic_add - add integer to atomic variable
* @i: integer value to add
* @v: pointer of type atomic_t
*
* Atomically adds @i to @v.
*/
static __always_inline void arch_atomic_add(int i, atomic_t *v)
{
asm volatile(LOCK_PREFIX "addl %1,%0"
: "+m" (v->counter)
: "ir" (i));
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Brian Gerst | 15 | 88.24% | 1 | 33.33% |
| Hagen Paul Pfeifer | 1 | 5.88% | 1 | 33.33% |
| Dmitriy Vyukov | 1 | 5.88% | 1 | 33.33% |
| Total | 17 | 100.00% | 3 | 100.00% |
/**
* arch_atomic_sub - subtract integer from atomic variable
* @i: integer value to subtract
* @v: pointer of type atomic_t
*
* Atomically subtracts @i from @v.
*/
static __always_inline void arch_atomic_sub(int i, atomic_t *v)
{
asm volatile(LOCK_PREFIX "subl %1,%0"
: "+m" (v->counter)
: "ir" (i));
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Brian Gerst | 15 | 88.24% | 1 | 33.33% |
| Hagen Paul Pfeifer | 1 | 5.88% | 1 | 33.33% |
| Dmitriy Vyukov | 1 | 5.88% | 1 | 33.33% |
| Total | 17 | 100.00% | 3 | 100.00% |
/**
* arch_atomic_sub_and_test - subtract value from variable and test result
* @i: integer value to subtract
* @v: pointer of type atomic_t
*
* Atomically subtracts @i from @v and returns
* true if the result is zero, or false for all
* other cases.
*/
static __always_inline bool arch_atomic_sub_and_test(int i, atomic_t *v)
{
GEN_BINARY_RMWcc(LOCK_PREFIX "subl", v->counter, "er", i, "%0", e);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Peter Zijlstra | 15 | 46.88% | 1 | 14.29% |
| Brian Gerst | 11 | 34.38% | 1 | 14.29% |
| H. Peter Anvin | 4 | 12.50% | 3 | 42.86% |
| Hagen Paul Pfeifer | 1 | 3.12% | 1 | 14.29% |
| Dmitriy Vyukov | 1 | 3.12% | 1 | 14.29% |
| Total | 32 | 100.00% | 7 | 100.00% |
/**
* arch_atomic_inc - increment atomic variable
* @v: pointer of type atomic_t
*
* Atomically increments @v by 1.
*/
static __always_inline void arch_atomic_inc(atomic_t *v)
{
asm volatile(LOCK_PREFIX "incl %0"
: "+m" (v->counter));
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Brian Gerst | 12 | 85.71% | 1 | 33.33% |
| Dmitriy Vyukov | 1 | 7.14% | 1 | 33.33% |
| Hagen Paul Pfeifer | 1 | 7.14% | 1 | 33.33% |
| Total | 14 | 100.00% | 3 | 100.00% |
/**
* arch_atomic_dec - decrement atomic variable
* @v: pointer of type atomic_t
*
* Atomically decrements @v by 1.
*/
static __always_inline void arch_atomic_dec(atomic_t *v)
{
asm volatile(LOCK_PREFIX "decl %0"
: "+m" (v->counter));
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Brian Gerst | 12 | 85.71% | 1 | 33.33% |
| Hagen Paul Pfeifer | 1 | 7.14% | 1 | 33.33% |
| Dmitriy Vyukov | 1 | 7.14% | 1 | 33.33% |
| Total | 14 | 100.00% | 3 | 100.00% |
/**
* arch_atomic_dec_and_test - decrement and test
* @v: pointer of type atomic_t
*
* Atomically decrements @v by 1 and
* returns true if the result is 0, or false for all other
* cases.
*/
static __always_inline bool arch_atomic_dec_and_test(atomic_t *v)
{
GEN_UNARY_RMWcc(LOCK_PREFIX "decl", v->counter, "%0", e);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Peter Zijlstra | 13 | 52.00% | 1 | 16.67% |
| Brian Gerst | 8 | 32.00% | 1 | 16.67% |
| H. Peter Anvin | 2 | 8.00% | 2 | 33.33% |
| Hagen Paul Pfeifer | 1 | 4.00% | 1 | 16.67% |
| Dmitriy Vyukov | 1 | 4.00% | 1 | 16.67% |
| Total | 25 | 100.00% | 6 | 100.00% |
/**
* arch_atomic_inc_and_test - increment and test
* @v: pointer of type atomic_t
*
* Atomically increments @v by 1
* and returns true if the result is zero, or false for all
* other cases.
*/
static __always_inline bool arch_atomic_inc_and_test(atomic_t *v)
{
GEN_UNARY_RMWcc(LOCK_PREFIX "incl", v->counter, "%0", e);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Peter Zijlstra | 13 | 52.00% | 1 | 16.67% |
| Brian Gerst | 8 | 32.00% | 1 | 16.67% |
| H. Peter Anvin | 2 | 8.00% | 2 | 33.33% |
| Denys Vlasenko | 1 | 4.00% | 1 | 16.67% |
| Dmitriy Vyukov | 1 | 4.00% | 1 | 16.67% |
| Total | 25 | 100.00% | 6 | 100.00% |
/**
* arch_atomic_add_negative - add and test if negative
* @i: integer value to add
* @v: pointer of type atomic_t
*
* Atomically adds @i to @v and returns true
* if the result is negative, or false when
* result is greater than or equal to zero.
*/
static __always_inline bool arch_atomic_add_negative(int i, atomic_t *v)
{
GEN_BINARY_RMWcc(LOCK_PREFIX "addl", v->counter, "er", i, "%0", s);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Peter Zijlstra | 15 | 46.88% | 1 | 14.29% |
| Brian Gerst | 11 | 34.38% | 1 | 14.29% |
| H. Peter Anvin | 4 | 12.50% | 3 | 42.86% |
| Denys Vlasenko | 1 | 3.12% | 1 | 14.29% |
| Dmitriy Vyukov | 1 | 3.12% | 1 | 14.29% |
| Total | 32 | 100.00% | 7 | 100.00% |
/**
* arch_atomic_add_return - add integer and return
* @i: integer value to add
* @v: pointer of type atomic_t
*
* Atomically adds @i to @v and returns @i + @v
*/
static __always_inline int arch_atomic_add_return(int i, atomic_t *v)
{
return i + xadd(&v->counter, i);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Brian Gerst | 16 | 59.26% | 1 | 25.00% |
| Jeremy Fitzhardinge | 9 | 33.33% | 1 | 25.00% |
| Dmitriy Vyukov | 1 | 3.70% | 1 | 25.00% |
| Hagen Paul Pfeifer | 1 | 3.70% | 1 | 25.00% |
| Total | 27 | 100.00% | 4 | 100.00% |
/**
* arch_atomic_sub_return - subtract integer and return
* @v: pointer of type atomic_t
* @i: integer value to subtract
*
* Atomically subtracts @i from @v and returns @v - @i
*/
static __always_inline int arch_atomic_sub_return(int i, atomic_t *v)
{
return arch_atomic_add_return(-i, v);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Brian Gerst | 20 | 86.96% | 1 | 33.33% |
| Dmitriy Vyukov | 2 | 8.70% | 1 | 33.33% |
| Denys Vlasenko | 1 | 4.35% | 1 | 33.33% |
| Total | 23 | 100.00% | 3 | 100.00% |
#define arch_atomic_inc_return(v) (arch_atomic_add_return(1, v))
#define arch_atomic_dec_return(v) (arch_atomic_sub_return(1, v))
static __always_inline int arch_atomic_fetch_add(int i, atomic_t *v)
{
return xadd(&v->counter, i);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Peter Zijlstra | 24 | 96.00% | 1 | 50.00% |
| Dmitriy Vyukov | 1 | 4.00% | 1 | 50.00% |
| Total | 25 | 100.00% | 2 | 100.00% |
static __always_inline int arch_atomic_fetch_sub(int i, atomic_t *v)
{
return xadd(&v->counter, -i);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Peter Zijlstra | 25 | 96.15% | 1 | 50.00% |
| Dmitriy Vyukov | 1 | 3.85% | 1 | 50.00% |
| Total | 26 | 100.00% | 2 | 100.00% |
static __always_inline int arch_atomic_cmpxchg(atomic_t *v, int old, int new)
{
return arch_cmpxchg(&v->counter, old, new);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Brian Gerst | 27 | 90.00% | 1 | 33.33% |
| Dmitriy Vyukov | 2 | 6.67% | 1 | 33.33% |
| Denys Vlasenko | 1 | 3.33% | 1 | 33.33% |
| Total | 30 | 100.00% | 3 | 100.00% |
#define arch_atomic_try_cmpxchg arch_atomic_try_cmpxchg
static __always_inline bool arch_atomic_try_cmpxchg(atomic_t *v, int *old, int new)
{
return try_cmpxchg(&v->counter, old, new);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Peter Zijlstra | 30 | 96.77% | 1 | 50.00% |
| Dmitriy Vyukov | 1 | 3.23% | 1 | 50.00% |
| Total | 31 | 100.00% | 2 | 100.00% |
static inline int arch_atomic_xchg(atomic_t *v, int new)
{
return xchg(&v->counter, new);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Brian Gerst | 24 | 96.00% | 1 | 50.00% |
| Dmitriy Vyukov | 1 | 4.00% | 1 | 50.00% |
| Total | 25 | 100.00% | 2 | 100.00% |
static inline void arch_atomic_and(int i, atomic_t *v)
{
asm volatile(LOCK_PREFIX "andl %1,%0"
: "+m" (v->counter)
: "ir" (i)
: "memory");
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Dmitriy Vyukov | 15 | 88.24% | 2 | 66.67% |
| Peter Zijlstra | 2 | 11.76% | 1 | 33.33% |
| Total | 17 | 100.00% | 3 | 100.00% |
static inline int arch_atomic_fetch_and(int i, atomic_t *v)
{
int val = arch_atomic_read(v);
do { } while (!arch_atomic_try_cmpxchg(v, &val, val & i));
return val;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Dmitriy Vyukov | 40 | 93.02% | 2 | 66.67% |
| Peter Zijlstra | 3 | 6.98% | 1 | 33.33% |
| Total | 43 | 100.00% | 3 | 100.00% |
static inline void arch_atomic_or(int i, atomic_t *v)
{
asm volatile(LOCK_PREFIX "orl %1,%0"
: "+m" (v->counter)
: "ir" (i)
: "memory");
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Dmitriy Vyukov | 14 | 82.35% | 2 | 66.67% |
| Peter Zijlstra | 3 | 17.65% | 1 | 33.33% |
| Total | 17 | 100.00% | 3 | 100.00% |
static inline int arch_atomic_fetch_or(int i, atomic_t *v)
{
int val = arch_atomic_read(v);
do { } while (!arch_atomic_try_cmpxchg(v, &val, val | i));
return val;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Dmitriy Vyukov | 38 | 88.37% | 2 | 50.00% |
| Peter Zijlstra | 5 | 11.63% | 2 | 50.00% |
| Total | 43 | 100.00% | 4 | 100.00% |
static inline void arch_atomic_xor(int i, atomic_t *v)
{
asm volatile(LOCK_PREFIX "xorl %1,%0"
: "+m" (v->counter)
: "ir" (i)
: "memory");
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Dmitriy Vyukov | 17 | 100.00% | 2 | 100.00% |
| Total | 17 | 100.00% | 2 | 100.00% |
static inline int arch_atomic_fetch_xor(int i, atomic_t *v)
{
int val = arch_atomic_read(v);
do { } while (!arch_atomic_try_cmpxchg(v, &val, val ^ i));
return val;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Dmitriy Vyukov | 40 | 93.02% | 2 | 50.00% |
| Peter Zijlstra | 3 | 6.98% | 2 | 50.00% |
| Total | 43 | 100.00% | 4 | 100.00% |
/**
* __arch_atomic_add_unless - add unless the number is already a given value
* @v: pointer of type atomic_t
* @a: the amount to add to v...
* @u: ...unless v is equal to u.
*
* Atomically adds @a to @v, so long as @v was not already @u.
* Returns the old value of @v.
*/
static __always_inline int __arch_atomic_add_unless(atomic_t *v, int a, int u)
{
int c = arch_atomic_read(v);
do {
if (unlikely(c == u))
break;
} while (!arch_atomic_try_cmpxchg(v, &c, c + a));
return c;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Brian Gerst | 43 | 75.44% | 1 | 20.00% |
| Peter Zijlstra | 9 | 15.79% | 1 | 20.00% |
| Dmitriy Vyukov | 3 | 5.26% | 1 | 20.00% |
| Luca Barbieri | 1 | 1.75% | 1 | 20.00% |
| Hagen Paul Pfeifer | 1 | 1.75% | 1 | 20.00% |
| Total | 57 | 100.00% | 5 | 100.00% |
#ifdef CONFIG_X86_32
# include <asm/atomic64_32.h>
#else
# include <asm/atomic64_64.h>
#endif
#include <asm-generic/atomic-instrumented.h>
#endif /* _ASM_X86_ATOMIC_H */
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Brian Gerst | 293 | 40.19% | 1 | 4.35% |
| Dmitriy Vyukov | 209 | 28.67% | 3 | 13.04% |
| Peter Zijlstra | 173 | 23.73% | 7 | 30.43% |
| H. Peter Anvin | 12 | 1.65% | 3 | 13.04% |
| Thomas Gleixner | 11 | 1.51% | 1 | 4.35% |
| Jeremy Fitzhardinge | 9 | 1.23% | 1 | 4.35% |
| Hagen Paul Pfeifer | 8 | 1.10% | 1 | 4.35% |
| Denys Vlasenko | 6 | 0.82% | 1 | 4.35% |
| Pranith Kumar | 2 | 0.27% | 1 | 4.35% |
| Anton Blanchard | 2 | 0.27% | 1 | 4.35% |
| David Howells | 2 | 0.27% | 1 | 4.35% |
| Luca Barbieri | 1 | 0.14% | 1 | 4.35% |
| Greg Kroah-Hartman | 1 | 0.14% | 1 | 4.35% |
| Total | 729 | 100.00% | 23 | 100.00% |
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