From 629d9d1cafbd49cb374561a5a7d7724c4d6b2567 Mon Sep 17 00:00:00 2001 From: Arnd Bergmann Date: Mon, 18 Jan 2016 21:50:26 +0100 Subject: [PATCH] mm: avoid uninitialized variable in tracepoint A newly added tracepoint in the hugepage code uses a variable in the error handling that is not initialized at that point: include/trace/events/huge_memory.h:81:230: error: 'isolated' may be used uninitialized in this function [-Werror=maybe-uninitialized] The result is relatively harmless, as the trace data will in rare cases contain incorrect data. This works around the problem by adding an explicit initialization. Signed-off-by: Arnd Bergmann Fixes: 7d2eba0557c1 ("mm: add tracepoint for scanning pages") Reviewed-by: Ebru Akagunduz Acked-by: David Rientjes Cc: Kirill A. Shutemov Signed-off-by: Linus Torvalds --- mm/huge_memory.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 50342eff7960..b1cf73bc3b12 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -2320,7 +2320,7 @@ static void collapse_huge_page(struct mm_struct *mm, pgtable_t pgtable; struct page *new_page; spinlock_t *pmd_ptl, *pte_ptl; - int isolated, result = 0; + int isolated = 0, result = 0; unsigned long hstart, hend; struct mem_cgroup *memcg; unsigned long mmun_start; /* For mmu_notifiers */ -- 2.30.2