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mm/cma: add cma_pages_valid to determine if pages are in CMA

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Add new interface cma_pages_valid() which indicates if the specified
pages are part of a CMA region.  This interface will be used in a
subsequent patch by hugetlb code.

In order to keep the same amount of DEBUG information, a pr_debug() call
was added to cma_pages_valid().  In the case where the page passed to
cma_release is not in cma region, the debug message will be printed from
cma_pages_valid as opposed to cma_release.

Link: https://lkml.kernel.org/r/20211007181918.136982-3-mike.kravetz@oracle.com
Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com>
Acked-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
Cc: "Aneesh Kumar K . V" <aneesh.kumar@linux.ibm.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Cc: Naoya Horiguchi <naoya.horiguchi@linux.dev>
Cc: Nghia Le <nghialm78@gmail.com>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mike Kravetz 2021-11-05 13:41:23 -07:00 committed by Linus Torvalds
parent 79dfc69552
commit 9871e2ded6
2 changed files with 21 additions and 4 deletions
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1
include/linux/cma.h
View File

@ -46,6 +46,7 @@ extern int cma_init_reserved_mem(phys_addr_t base, phys_addr_t size,
struct cma **res_cma);
extern struct page *cma_alloc(struct cma *cma, unsigned long count, unsigned int align,
bool no_warn);
extern bool cma_pages_valid(struct cma *cma, const struct page *pages, unsigned long count);
extern bool cma_release(struct cma *cma, const struct page *pages, unsigned long count);
extern int cma_for_each_area(int (*it)(struct cma *cma, void *data), void *data);

24
mm/cma.c
View File

@ -524,6 +524,25 @@ out:
return page;
}
bool cma_pages_valid(struct cma *cma, const struct page *pages,
unsigned long count)
{
unsigned long pfn;
if (!cma || !pages)
return false;
pfn = page_to_pfn(pages);
if (pfn < cma->base_pfn || pfn >= cma->base_pfn + cma->count) {
pr_debug("%s(page %p, count %lu)\n", __func__,
(void *)pages, count);
return false;
}
return true;
}
/**
* cma_release() - release allocated pages
* @cma: Contiguous memory region for which the allocation is performed.
@ -539,16 +558,13 @@ bool cma_release(struct cma *cma, const struct page *pages,
{
unsigned long pfn;
if (!cma || !pages)
if (!cma_pages_valid(cma, pages, count))
return false;
pr_debug("%s(page %p, count %lu)\n", __func__, (void *)pages, count);
pfn = page_to_pfn(pages);
if (pfn < cma->base_pfn || pfn >= cma->base_pfn + cma->count)
return false;
VM_BUG_ON(pfn + count > cma->base_pfn + cma->count);
free_contig_range(pfn, count);