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cpumask: switch for_each_cpu{,_not} to use for_each_bit()

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The difference between for_each_cpu() and for_each_set_bit()
is that the latter uses cpumask_next() instead of find_next_bit(),
and so calls cpumask_check().

This check is useless because the iterator value is not provided by
user. It generates false-positives for the very last iteration
of for_each_cpu().

Signed-off-by: Yury Norov <yury.norov@gmail.com>
This commit is contained in:
Yury Norov 2022-09-19 14:05:55 -07:00
parent 854701ba4c
commit 33e67710be
2 changed files with 8 additions and 9 deletions
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12
include/linux/cpumask.h
View File

@ -246,9 +246,7 @@ unsigned int cpumask_next_and(int n, const struct cpumask *src1p,
* After the loop, cpu is >= nr_cpu_ids.
*/
#define for_each_cpu(cpu, mask) \
for ((cpu) = -1; \
(cpu) = cpumask_next((cpu), (mask)), \
(cpu) < nr_cpu_ids;)
for_each_set_bit(cpu, cpumask_bits(mask), nr_cpumask_bits)
/**
* for_each_cpu_not - iterate over every cpu in a complemented mask
@ -258,9 +256,7 @@ unsigned int cpumask_next_and(int n, const struct cpumask *src1p,
* After the loop, cpu is >= nr_cpu_ids.
*/
#define for_each_cpu_not(cpu, mask) \
for ((cpu) = -1; \
(cpu) = cpumask_next_zero((cpu), (mask)), \
(cpu) < nr_cpu_ids;)
for_each_clear_bit(cpu, cpumask_bits(mask), nr_cpumask_bits)
#if NR_CPUS == 1
static inline
@ -313,9 +309,7 @@ unsigned int __pure cpumask_next_wrap(int n, const struct cpumask *mask, int sta
* After the loop, cpu is >= nr_cpu_ids.
*/
#define for_each_cpu_and(cpu, mask1, mask2) \
for ((cpu) = -1; \
(cpu) = cpumask_next_and((cpu), (mask1), (mask2)), \
(cpu) < nr_cpu_ids;)
for_each_and_bit(cpu, cpumask_bits(mask1), cpumask_bits(mask2), nr_cpumask_bits)
/**
* cpumask_any_but - return a "random" in a cpumask, but not this one.

5
include/linux/find.h
View File

@ -390,6 +390,11 @@ unsigned long find_next_bit_le(const void *addr, unsigned
(bit) < (size); \
(bit) = find_next_bit((addr), (size), (bit) + 1))
#define for_each_and_bit(bit, addr1, addr2, size) \
for ((bit) = find_next_and_bit((addr1), (addr2), (size), 0); \
(bit) < (size); \
(bit) = find_next_and_bit((addr1), (addr2), (size), (bit) + 1))
/* same as for_each_set_bit() but use bit as value to start with */
#define for_each_set_bit_from(bit, addr, size) \
for ((bit) = find_next_bit((addr), (size), (bit)); \