linux-kernel - [PATCH] powerpc: silence unused-but-set-variable warnings

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Message-Id: <20190307034821.48769-1-cai@lca.pw>
Date:   Wed,  6 Mar 2019 22:48:21 -0500
From:   Qian Cai <cai@....pw>
To:     benh@...nel.crashing.org, paulus@...ba.org, mpe@...erman.id.au
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        Qian Cai <cai@....pw>
Subject: [PATCH] powerpc: silence unused-but-set-variable warnings

pte_unmap() compiles away on some powerpc platforms, so silence the
warnings below by using the argument to pte_unmap() as a nop. Also, fix
checkpatch.pl warnings "Single statement macros should not use a do {}
while (0) loop".

mm/memory.c: In function 'copy_pte_range':
mm/memory.c:820:24: warning: variable 'orig_dst_pte' set but not used
[-Wunused-but-set-variable]
mm/memory.c:820:9: warning: variable 'orig_src_pte' set but not used
[-Wunused-but-set-variable]
mm/madvise.c: In function 'madvise_free_pte_range':
mm/madvise.c:318:9: warning: variable 'orig_pte' set but not used
[-Wunused-but-set-variable]
mm/swap_state.c: In function 'swap_ra_info':
mm/swap_state.c:634:15: warning: variable 'orig_pte' set but not used
[-Wunused-but-set-variable]

Signed-off-by: Qian Cai <cai@....pw>
---
 arch/powerpc/include/asm/book3s/64/pgtable.h | 2 +-
 arch/powerpc/include/asm/nohash/64/pgtable.h | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h
index 868fcaf56f6b..ec00ce6dd312 100644
--- a/arch/powerpc/include/asm/book3s/64/pgtable.h
+++ b/arch/powerpc/include/asm/book3s/64/pgtable.h
@@ -1006,7 +1006,7 @@ extern struct page *pgd_page(pgd_t pgd);
 	(((pte_t *) pmd_page_vaddr(*(dir))) + pte_index(addr))
 
 #define pte_offset_map(dir,addr)	pte_offset_kernel((dir), (addr))
-#define pte_unmap(pte)			do { } while(0)
+#define pte_unmap(pte)			(void)(pte)
 
 /* to find an entry in a kernel page-table-directory */
 /* This now only contains the vmalloc pages */
diff --git a/arch/powerpc/include/asm/nohash/64/pgtable.h b/arch/powerpc/include/asm/nohash/64/pgtable.h
index e77ed9761632..103071afab3d 100644
--- a/arch/powerpc/include/asm/nohash/64/pgtable.h
+++ b/arch/powerpc/include/asm/nohash/64/pgtable.h
@@ -205,7 +205,7 @@ static inline void pgd_set(pgd_t *pgdp, unsigned long val)
   (((pte_t *) pmd_page_vaddr(*(dir))) + (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)))
 
 #define pte_offset_map(dir,addr)	pte_offset_kernel((dir), (addr))
-#define pte_unmap(pte)			do { } while(0)
+#define pte_unmap(pte)			(void)(pte)
 
 /* to find an entry in a kernel page-table-directory */
 /* This now only contains the vmalloc pages */
-- 
2.17.2 (Apple Git-113)