linux-kernel - [PATCH v2] mm/hugepages: fix "orig

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Message-Id: <20190301221956.97493-1-cai@lca.pw>
Date:   Fri,  1 Mar 2019 17:19:56 -0500
From:   Qian Cai <cai@....pw>
To:     akpm@...ux-foundation.org
Cc:     willy@...radead.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Qian Cai <cai@....pw>
Subject: [PATCH v2] mm/hugepages: fix "orig_pud" set but not used

The commit a00cc7d9dd93 ("mm, x86: add support for PUD-sized transparent
hugepages") introduced pudp_huge_get_and_clear_full() but no one uses
its return code. In order to not diverge from
pmdp_huge_get_and_clear_full(), just change zap_huge_pud() to not assign
the return value from pudp_huge_get_and_clear_full().

mm/huge_memory.c: In function 'zap_huge_pud':
mm/huge_memory.c:1982:8: warning: variable 'orig_pud' set but not used
[-Wunused-but-set-variable]
  pud_t orig_pud;
        ^~~~~~~~

Signed-off-by: Qian Cai <cai@....pw>
---

v2: keep returning a code from pudp_huge_get_and_clear_full() for possible
    future uses.

 mm/huge_memory.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index faf357eaf0ce..9f57a1173e6a 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1979,7 +1979,6 @@ spinlock_t *__pud_trans_huge_lock(pud_t *pud, struct vm_area_struct *vma)
 int zap_huge_pud(struct mmu_gather *tlb, struct vm_area_struct *vma,
 		 pud_t *pud, unsigned long addr)
 {
-	pud_t orig_pud;
 	spinlock_t *ptl;
 
 	ptl = __pud_trans_huge_lock(pud, vma);
@@ -1991,8 +1990,7 @@ int zap_huge_pud(struct mmu_gather *tlb, struct vm_area_struct *vma,
 	 * pgtable_trans_huge_withdraw after finishing pudp related
 	 * operations.
 	 */
-	orig_pud = pudp_huge_get_and_clear_full(tlb->mm, addr, pud,
-			tlb->fullmm);
+	pudp_huge_get_and_clear_full(tlb->mm, addr, pud, tlb->fullmm);
 	tlb_remove_pud_tlb_entry(tlb, pud, addr);
 	if (vma_is_dax(vma)) {
 		spin_unlock(ptl);
-- 
2.17.2 (Apple Git-113)