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Message-Id: <20190422103836.48566-1-swkhack@gmail.com> Date: Mon, 22 Apr 2019 18:38:36 +0800 From: Weikang shi <swkhack@...il.com> To: linux-mm@...ck.org Cc: linux-kernel@...r.kernel.org, swkhack <swkhack@...il.com> Subject: [PATCH] mm: Change count_mm_mlocked_page_nr return type From: swkhack <swkhack@...il.com> In 64-bit machine,the value of "vma->vm_end - vma->vm_start" maybe negative in 32bit int and the "count >> PAGE_SHIFT"'s rusult will be wrong.So change the local variable and return value to unsigned long will fix the problem. Signed-off-by: swkhack <swkhack@...il.com> --- mm/mlock.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/mm/mlock.c b/mm/mlock.c index 080f3b364..d614163f5 100644 --- a/mm/mlock.c +++ b/mm/mlock.c @@ -636,11 +636,11 @@ static int apply_vma_lock_flags(unsigned long start, size_t len, * is also counted. * Return value: previously mlocked page counts */ -static int count_mm_mlocked_page_nr(struct mm_struct *mm, +static unsigned long count_mm_mlocked_page_nr(struct mm_struct *mm, unsigned long start, size_t len) { struct vm_area_struct *vma; - int count = 0; + unsigned long count = 0; if (mm == NULL) mm = current->mm; -- 2.17.1
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