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authorMike Kravetz <mike.kravetz@oracle.com>2021-11-05 13:41:23 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2021-11-06 13:30:39 -0700
commit9871e2ded6c1ff61a59988d7a0e975f012105d52 (patch)
tree0a8b13329b927d7252a6baa2f29cb670c8101bd2 /mm/cma.c
parent79dfc695525f60c8410015362b8aa4eb5c57210c (diff)
downloadlinux-9871e2ded6c1ff61a59988d7a0e975f012105d52.tar.bz2
mm/cma: add cma_pages_valid to determine if pages are in CMA
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>
Diffstat (limited to 'mm/cma.c')
-rw-r--r--mm/cma.c24
1 files changed, 20 insertions, 4 deletions
diff --git a/mm/cma.c b/mm/cma.c
index 995e15480937..11152c3fb23c 100644
--- a/mm/cma.c
+++ b/mm/cma.c
@@ -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);