linux-kernel - [PATCH] arm64/mm: fix variable 'pud' set but not used

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Date:   Wed, 31 Jul 2019 16:05:45 -0400
From:   Qian Cai <cai@....pw>
To:     catalin.marinas@....com
Cc:     will@...nel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Qian Cai <cai@....pw>
Subject: [PATCH] arm64/mm: fix variable 'pud' set but not used

GCC throws a warning,

arch/arm64/mm/mmu.c: In function 'pud_free_pmd_page':
arch/arm64/mm/mmu.c:1033:8: warning: variable 'pud' set but not used
[-Wunused-but-set-variable]
  pud_t pud;
        ^~~

because pud_table() is a macro and compiled away. Fix it by making it a
static inline function and for pud_sect() as well.

Signed-off-by: Qian Cai <cai@....pw>
---
 arch/arm64/include/asm/pgtable.h | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index 3f5461f7b560..541cb4a15341 100644
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -447,8 +447,15 @@ extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
 				 PMD_TYPE_SECT)
 
 #if defined(CONFIG_ARM64_64K_PAGES) || CONFIG_PGTABLE_LEVELS < 3
-#define pud_sect(pud)		(0)
-#define pud_table(pud)		(1)
+static inline bool pud_sect(pud_t pud)
+{
+	return false;
+}
+
+static inline bool pud_table(pud_t pud)
+{
+	return true;
+}
 #else
 #define pud_sect(pud)		((pud_val(pud) & PUD_TYPE_MASK) == \
 				 PUD_TYPE_SECT)
-- 
1.8.3.1