linux-kernel - [PATCH -next] mm/userfaultfd: fix a GCC compilation warning

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Date:   Tue,  8 Oct 2019 10:15:08 -0400
From:   Qian Cai <cai@....pw>
To:     akpm@...ux-foundation.org
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Qian Cai <cai@....pw>
Subject: [PATCH -next] mm/userfaultfd: fix a GCC compilation warning

The linux-next commit
"hugetlb-remove-unused-hstate-in-hugetlb_fault_mutex_hash-fix" seems
accidentally add back an unused variable that was correctly removed in
the commit "hugetlb: remove unused hstate in hugetlb_fault_mutex_hash()"
[1].

mm/userfaultfd.c: In function '__mcopy_atomic_hugetlb':
mm/userfaultfd.c:217:17: warning: variable 'h' set but not used
[-Wunused-but-set-variable]
  struct hstate *h;
                 ^

[1] http://lkml.kernel.org/r/20191005003302.785-1-richardw.yang@linux.intel.com

Signed-off-by: Qian Cai <cai@....pw>
---
 mm/userfaultfd.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/mm/userfaultfd.c b/mm/userfaultfd.c
index 4cb4ef3d9128..1b0d7abad1d4 100644
--- a/mm/userfaultfd.c
+++ b/mm/userfaultfd.c
@@ -214,7 +214,6 @@ static __always_inline ssize_t __mcopy_atomic_hugetlb(struct mm_struct *dst_mm,
 	unsigned long src_addr, dst_addr;
 	long copied;
 	struct page *page;
-	struct hstate *h;
 	unsigned long vma_hpagesize;
 	pgoff_t idx;
 	u32 hash;
@@ -271,8 +270,6 @@ static __always_inline ssize_t __mcopy_atomic_hugetlb(struct mm_struct *dst_mm,
 			goto out_unlock;
 	}
 
-	h = hstate_vma(dst_vma);
-
 	while (src_addr < src_start + len) {
 		pte_t dst_pteval;
 
-- 
1.8.3.1