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mm/cma: don't treat bad input arguments for cma_alloc() as its failure

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Invalid cma_alloc() input scenarios - including excess allocation request
should neither be counted as CMA_ALLOC_FAIL nor 'cma->nr_pages_failed' be
updated when applicable with CONFIG_CMA_SYSFS. This also drops 'out' jump
label which has become redundant.

Link: https://lkml.kernel.org/r/20240201023714.3871061-1-anshuman.khandual@arm.com
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Kalesh Singh <kaleshsingh@google.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Anshuman Khandual 2024-02-01 08:07:14 +05:30 committed by Andrew Morton
parent 565474afe0
commit d818c98a52
1 changed files with 4 additions and 6 deletions
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8
mm/cma.c
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@ -441,13 +441,13 @@ struct page *cma_alloc(struct cma *cma, unsigned long count,
trace_cma_alloc_start(name, count, align);
if (!cma || !cma->count || !cma->bitmap)
goto out;
return page;
pr_debug("%s(cma %p, name: %s, count %lu, align %d)\n", __func__,
(void *)cma, cma->name, count, align);
if (!count)
goto out;
return page;
mask = cma_bitmap_aligned_mask(cma, align);
offset = cma_bitmap_aligned_offset(cma, align);
@ -455,7 +455,7 @@ struct page *cma_alloc(struct cma *cma, unsigned long count,
bitmap_count = cma_bitmap_pages_to_bits(cma, count);
if (bitmap_count > bitmap_maxno)
goto out;
return page;
for (;;) {
spin_lock_irq(&cma->lock);
@ -514,14 +514,12 @@ struct page *cma_alloc(struct cma *cma, unsigned long count,
}
pr_debug("%s(): returned %p\n", __func__, page);
out:
trace_cma_alloc_finish(name, pfn, page, count, align, ret);
if (page) {
count_vm_event(CMA_ALLOC_SUCCESS);
cma_sysfs_account_success_pages(cma, count);
} else {
count_vm_event(CMA_ALLOC_FAIL);
if (cma)
cma_sysfs_account_fail_pages(cma, count);
}