mm/huge_memory.c: fix "orig_pud" set but not used

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;
          ^~~~~~~~

Link: http://lkml.kernel.org/r/20190301221956.97493-1-cai@lca.pw
Signed-off-by: Qian Cai <cai@lca.pw>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index fcf657886b4bc376a56746182af4830f519f1808..404acdcd0455d0d3dda191d994dfb27d0359104e 100644 (file)
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1982,7 +1982,6 @@ 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);
@@ -1994,8 +1993,7 @@ 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);