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bitmap: unify find_bit operations

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bitmap_for_each_{set,clear}_region() are similar to for_each_bit()
macros in include/linux/find.h, but interface and implementation
of them are different.

This patch adds for_each_bitrange() macros and drops unused
bitmap_*_region() API in sake of unification.

Signed-off-by: Yury Norov <yury.norov@gmail.com>
Tested-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Acked-by: Dennis Zhou <dennis@kernel.org>
Acked-by: Ulf Hansson <ulf.hansson@linaro.org> # For MMC
This commit is contained in:
Yury Norov
2021-08-14 14:17:11 -07:00
parent 801a57365f
commit ec288a2cf7
4 changed files with 65 additions and 46 deletions
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20
mm/percpu.c
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@@ -779,7 +779,7 @@ static void pcpu_block_refresh_hint(struct pcpu_chunk *chunk, int index)
{
struct pcpu_block_md *block = chunk->md_blocks + index;
unsigned long *alloc_map = pcpu_index_alloc_map(chunk, index);
unsigned int rs, re, start; /* region start, region end */
unsigned int start, end; /* region start, region end */
/* promote scan_hint to contig_hint */
if (block->scan_hint) {
@@ -795,9 +795,8 @@ static void pcpu_block_refresh_hint(struct pcpu_chunk *chunk, int index)
block->right_free = 0;
/* iterate over free areas and update the contig hints */
bitmap_for_each_clear_region(alloc_map, rs, re, start,
PCPU_BITMAP_BLOCK_BITS)
pcpu_block_update(block, rs, re);
for_each_clear_bitrange_from(start, end, alloc_map, PCPU_BITMAP_BLOCK_BITS)
pcpu_block_update(block, start, end);
}
/**
@@ -1852,13 +1851,12 @@ area_found:
/* populate if not all pages are already there */
if (!is_atomic) {
unsigned int page_start, page_end, rs, re;
unsigned int page_end, rs, re;
page_start = PFN_DOWN(off);
rs = PFN_DOWN(off);
page_end = PFN_UP(off + size);
bitmap_for_each_clear_region(chunk->populated, rs, re,
page_start, page_end) {
for_each_clear_bitrange_from(rs, re, chunk->populated, page_end) {
WARN_ON(chunk->immutable);
ret = pcpu_populate_chunk(chunk, rs, re, pcpu_gfp);
@@ -2014,8 +2012,7 @@ static void pcpu_balance_free(bool empty_only)
list_for_each_entry_safe(chunk, next, &to_free, list) {
unsigned int rs, re;
bitmap_for_each_set_region(chunk->populated, rs, re, 0,
chunk->nr_pages) {
for_each_set_bitrange(rs, re, chunk->populated, chunk->nr_pages) {
pcpu_depopulate_chunk(chunk, rs, re);
spin_lock_irq(&pcpu_lock);
pcpu_chunk_depopulated(chunk, rs, re);
@@ -2085,8 +2082,7 @@ retry_pop:
continue;
/* @chunk can't go away while pcpu_alloc_mutex is held */
bitmap_for_each_clear_region(chunk->populated, rs, re, 0,
chunk->nr_pages) {
for_each_clear_bitrange(rs, re, chunk->populated, chunk->nr_pages) {
int nr = min_t(int, re - rs, nr_to_pop);
spin_unlock_irq(&pcpu_lock);