On 11/25/20 4:32 PM, Charan Teja Reddy wrote:
It is required to print 'count' of pages, along with the pages, passed
to cma_release to debug the cases of mismatched count value passed
between cma_alloc() and cma_release() from a code path.

As an example, consider the below scenario:
1) CMA pool size is 4MB and
2) User doing the erroneous step of allocating 2 pages but freeing 1
page in a loop from this CMA pool.
The step 2 causes cma_alloc() to return NULL at one point of time
because of -ENOMEM condition.

And the current pr_debug logs is not giving the info about these types
of allocation patterns because of count value not being printed in
cma_release().

We are printing the count value in the trace logs, just extend the same
to pr_debug logs too.

Signed-off-by: Charan Teja Reddy <chara...@codeaurora.org>

Acked-by: Vlastimil Babka <vba...@suse.cz>

---
  mm/cma.c | 2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/cma.c b/mm/cma.c
index 7f415d7..07c904b 100644
--- a/mm/cma.c
+++ b/mm/cma.c
@@ -512,7 +512,7 @@ bool cma_release(struct cma *cma, const struct page *pages, 
unsigned int count)
        if (!cma || !pages)
                return false;
- pr_debug("%s(page %p)\n", __func__, (void *)pages);
+       pr_debug("%s(page %p, count %zu)\n", __func__, (void *)pages, count);
pfn = page_to_pfn(pages);

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