[PATCH v2] mm/hugepages: fix "orig_pud" set but not used

From: Qian Cai
Date: Fri Mar 01 2019 - 17:20:13 EST

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
pud_t orig_pud;

Signed-off-by: Qian Cai <cai@xxxxxx>

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)) {
2.17.2 (Apple Git-113)