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SubjectRe: [RFC linux-next PATCH] mm: khugepaged: remove error message when checking external pins
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On 5/21/20 7:56 AM, Qian Cai wrote:
> On Wed, May 13, 2020 at 05:03:03AM +0800, Yang Shi wrote:
> []
>> mm/khugepaged.c | 24 +++++++++++++++++-------
>> 1 file changed, 17 insertions(+), 7 deletions(-)
>>
>> diff --git a/mm/khugepaged.c b/mm/khugepaged.c
>> index 1fdd677..048f5d4 100644
>> --- a/mm/khugepaged.c
>> +++ b/mm/khugepaged.c
>> @@ -602,12 +602,6 @@ static bool is_refcount_suitable(struct page *page)
>> if (PageSwapCache(page))
>> expected_refcount += compound_nr(page);
>>
>> - if (IS_ENABLED(CONFIG_DEBUG_VM) && expected_refcount > refcount) {
>> - pr_err("expected_refcount (%d) > refcount (%d)\n",
>> - expected_refcount, refcount);
>> - dump_page(page, "Unexpected refcount");
>> - }
>> -
>> return page_count(page) == expected_refcount;
>> }
> mm/khugepaged.c: In function 'is_refcount_suitable':
> mm/khugepaged.c:575:25: warning: variable 'refcount set but not used [-Wunused-but-set-variable]
> int expected_refcount, refcount;
> ^~~~~~~~
>
> --- a/mm/khugepaged.c
> +++ b/mm/khugepaged.c
> @@ -572,9 +572,8 @@ static void release_pte_pages(pte_t *pte, pte_t *_pte,
>
> static bool is_refcount_suitable(struct page *page)
> {
> - int expected_refcount, refcount;
> + int expected_refcount;
>
> - refcount = page_count(page);
> expected_refcount = total_mapcount(page);
> if (PageSwapCache(page))
> expected_refcount += compound_nr(page);

Thanks for catching this.


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