Eric Lee / smarc-fsl-linux-kernel

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Commit 5e97b9309baa76b476ec7e0d6e9c097edeb4142c

Authored by Mathieu Desnoyers
Committed by Linus Torvalds
1 parent 2856f5e31c
Exists in master and in 39 other branches 8mp-imx_5.4.70_2.3.0, 8qm-imx_5.4.70_2.3.0, emb_imx_lf-5.15.y, emb_lf-6.1.y, imx_3.0.35_4.1.0, imx_3.10.17_1.0.1_ga, imx_3.10.53_1.1.0_ga, imx_3.14.28_1.0.0_ga, imx_4.1.15_1.0.0_ga, pitx_8mp_lf-5.10.y, rt-smarc-imx_4.1.15_1.0.0_ga, rt_linux_5.15.71, smarc-8m-android-11.0.0_2.0.0, smarc-imx6_4.14.98_2.0.0_ga, smarc-imx6_4.9.88_2.0.0_ga, smarc-imx7_4.14.98_2.0.0_ga, smarc-imx7_4.9.11_1.0.0_ga, smarc-imx7_4.9.88_2.0.0_ga, smarc-imx_3.10.53_1.1.0_ga, smarc-imx_3.14.28_1.0.0_ga, smarc-imx_4.1.15_1.0.0_ga, smarc-imx_4.9.11_1.0.0_ga, smarc-imx_4.9.51_imx8m_ga, smarc-imx_4.9.88_2.0.0_ga, smarc-m6.0.1_2.1.0-ga, smarc-n7.1.2_2.0.0-ga, smarc-rel_imx_4.1.15_1.2.0_ga, smarc_8m_00d0_imx_4.14.98_2.0.0_ga, smarc_8m_imx_4.14.78_1.0.0_ga, smarc_8m_imx_4.14.98_2.0.0_ga, smarc_8m_imx_4.19.35_1.1.0, smarc_8mm_imx_4.14.78_1.0.0_ga, smarc_8mm_imx_4.14.98_2.0.0_ga, smarc_8mm_imx_4.19.35_1.1.0, smarc_8mm_imx_5.4.24_2.1.0, smarc_8mp_lf-5.10.y, smarc_8mq_imx_5.4.24_2.1.0, smarc_8mq_lf-5.10.y, smarc_imx_lf-5.15.y

local_t: architecture independent extension 

This series extena and standardises local_t operations on each architecture,
allowing a rich set of atomic operations to be done on per-cpu data with
minimal performance impact.  On architectures where there seems to be no
difference between the SMP and UP operation (same memory barriers, same
LOCKing), local.h simply includes asm-generic/local.h, which removes
duplicated code from the current kernel tree.

This patch:

local_t: architecture independent extension

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Showing 1 changed file with 23 additions and 10 deletions Side-by-side Diff

include/asm-generic/local.h
Diff comments   View file @ 5e97b93
... ... @@ -33,6 +33,19 @@
33 33 #define local_add(i,l) atomic_long_add((i),(&(l)->a))
34 34 #define local_sub(i,l) atomic_long_sub((i),(&(l)->a))
35 35  
  36 +#define local_sub_and_test(i, l) atomic_long_sub_and_test((i), (&(l)->a))
  37 +#define local_dec_and_test(l) atomic_long_dec_and_test(&(l)->a)
  38 +#define local_inc_and_test(l) atomic_long_inc_and_test(&(l)->a)
  39 +#define local_add_negative(i, l) atomic_long_add_negative((i), (&(l)->a))
  40 +#define local_add_return(i, l) atomic_long_add_return((i), (&(l)->a))
  41 +#define local_sub_return(i, l) atomic_long_sub_return((i), (&(l)->a))
  42 +#define local_inc_return(l) atomic_long_inc_return(&(l)->a)
  43 +
  44 +#define local_cmpxchg(l, o, n) atomic_long_cmpxchg((&(l)->a), (o), (n))
  45 +#define local_xchg(l, n) atomic_long_xchg((&(l)->a), (n))
  46 +#define local_add_unless(l, a, u) atomic_long_add_unless((&(l)->a), (a), (u))
  47 +#define local_inc_not_zero(l) atomic_long_inc_not_zero(&(l)->a)
  48 +
36 49 /* Non-atomic variants, ie. preemption disabled and won't be touched
37 50 * in interrupt, etc. Some archs can optimize this case well. */
38 51 #define __local_inc(l) local_set((l), local_read(l) + 1)
39 52  
... ... @@ -44,20 +57,20 @@
44 57 * much more efficient than these naive implementations. Note they take
45 58 * a variable (eg. mystruct.foo), not an address.
46 59 */
47   -#define cpu_local_read(v) local_read(&__get_cpu_var(v))
48   -#define cpu_local_set(v, i) local_set(&__get_cpu_var(v), (i))
49   -#define cpu_local_inc(v) local_inc(&__get_cpu_var(v))
50   -#define cpu_local_dec(v) local_dec(&__get_cpu_var(v))
51   -#define cpu_local_add(i, v) local_add((i), &__get_cpu_var(v))
52   -#define cpu_local_sub(i, v) local_sub((i), &__get_cpu_var(v))
  60 +#define cpu_local_read(l) local_read(&__get_cpu_var(l))
  61 +#define cpu_local_set(l, i) local_set(&__get_cpu_var(l), (i))
  62 +#define cpu_local_inc(l) local_inc(&__get_cpu_var(l))
  63 +#define cpu_local_dec(l) local_dec(&__get_cpu_var(l))
  64 +#define cpu_local_add(i, l) local_add((i), &__get_cpu_var(l))
  65 +#define cpu_local_sub(i, l) local_sub((i), &__get_cpu_var(l))
53 66  
54 67 /* Non-atomic increments, ie. preemption disabled and won't be touched
55 68 * in interrupt, etc. Some archs can optimize this case well.
56 69 */
57   -#define __cpu_local_inc(v) __local_inc(&__get_cpu_var(v))
58   -#define __cpu_local_dec(v) __local_dec(&__get_cpu_var(v))
59   -#define __cpu_local_add(i, v) __local_add((i), &__get_cpu_var(v))
60   -#define __cpu_local_sub(i, v) __local_sub((i), &__get_cpu_var(v))
  70 +#define __cpu_local_inc(l) __local_inc(&__get_cpu_var(l))
  71 +#define __cpu_local_dec(l) __local_dec(&__get_cpu_var(l))
  72 +#define __cpu_local_add(i, l) __local_add((i), &__get_cpu_var(l))
  73 +#define __cpu_local_sub(i, l) __local_sub((i), &__get_cpu_var(l))
61 74  
62 75 #endif /* _ASM_GENERIC_LOCAL_H */