linux-kernel - [PATCH] x86/mm: fix "prev

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Message-Id: <20190228213246.87915-1-cai@lca.pw>
Date:   Thu, 28 Feb 2019 16:32:46 -0500
From:   Qian Cai <cai@....pw>
To:     dave.hansen@...ux.intel.com, luto@...nel.org, peterz@...radead.org
Cc:     aryabinin@...tuozzo.com, tglx@...utronix.de, mingo@...hat.com,
        bp@...en8.de, hpa@...or.com, x86@...nel.org,
        linux-kernel@...r.kernel.org, Qian Cai <cai@....pw>
Subject: [PATCH] x86/mm: fix "prev_pud" set but not used

The commit 04b67022fb6d ("x86/mm/dump_pagetables: Speed up page tables
dump for CONFIG_KASAN=y") removed pud_already_checked() but left a
unused variable.

arch/x86/mm/dump_pagetables.c: In function 'walk_pud_level':
arch/x86/mm/dump_pagetables.c:447:9: warning: variable 'prev_pud' set
but not used [-Wunused-but-set-variable]
  pud_t *prev_pud = NULL;
         ^~~~~~~~

Signed-off-by: Qian Cai <cai@....pw>
---
 arch/x86/mm/dump_pagetables.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/arch/x86/mm/dump_pagetables.c b/arch/x86/mm/dump_pagetables.c
index e3cdc85ce5b6..ee8f8ab46941 100644
--- a/arch/x86/mm/dump_pagetables.c
+++ b/arch/x86/mm/dump_pagetables.c
@@ -444,7 +444,6 @@ static void walk_pud_level(struct seq_file *m, struct pg_state *st, p4d_t addr,
 	int i;
 	pud_t *start, *pud_start;
 	pgprotval_t prot, eff;
-	pud_t *prev_pud = NULL;
 
 	pud_start = start = (pud_t *)p4d_page_vaddr(addr);
 
@@ -462,7 +461,6 @@ static void walk_pud_level(struct seq_file *m, struct pg_state *st, p4d_t addr,
 		} else
 			note_page(m, st, __pgprot(0), 0, 3);
 
-		prev_pud = start;
 		start++;
 	}
 }
-- 
2.17.2 (Apple Git-113)