linux-kernel - [PATCH v2 03/19] powerpc: Mark variables as unused

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Date:   Wed, 28 Mar 2018 21:33:07 +0200
From:   Mathieu Malaterre <malat@...ian.org>
To:     Michael Ellerman <mpe@...erman.id.au>
Cc:     LEROY Christophe <christophe.leroy@....fr>,
        Mathieu Malaterre <malat@...ian.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 03/19] powerpc: Mark variables as unused

Add gcc attribute unused for two variables. Fix warnings treated as errors
with W=1:

  arch/powerpc/kernel/prom_init.c:1388:8: error: variable ‘path’ set but not used [-Werror=unused-but-set-variable]

Suggested-by: Christophe Leroy <christophe.leroy@....fr>
Signed-off-by: Mathieu Malaterre <malat@...ian.org>
---
v2: move path within ifdef DEBUG_PROM

 arch/powerpc/kernel/prom_init.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c
index acf4b2e0530c..4163b11abb6c 100644
--- a/arch/powerpc/kernel/prom_init.c
+++ b/arch/powerpc/kernel/prom_init.c
@@ -603,7 +603,7 @@ static void __init early_cmdline_parse(void)
 	const char *opt;
 
 	char *p;
-	int l = 0;
+	int l __maybe_unused = 0;
 
 	prom_cmd_line[0] = 0;
 	p = prom_cmd_line;
@@ -1385,7 +1385,7 @@ static void __init reserve_mem(u64 base, u64 size)
 static void __init prom_init_mem(void)
 {
 	phandle node;
-	char *path, type[64];
+	char *path __maybe_unused, type[64];
 	unsigned int plen;
 	cell_t *p, *endp;
 	__be32 val;
@@ -1406,7 +1406,6 @@ static void __init prom_init_mem(void)
 	prom_debug("root_size_cells: %x\n", rsc);
 
 	prom_debug("scanning memory:\n");
-	path = prom_scratch;
 
 	for (node = 0; prom_next_node(&node); ) {
 		type[0] = 0;
@@ -1431,6 +1430,7 @@ static void __init prom_init_mem(void)
 		endp = p + (plen / sizeof(cell_t));
 
 #ifdef DEBUG_PROM
+		path = prom_scratch;
 		memset(path, 0, PROM_SCRATCH_SIZE);
 		call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-1);
 		prom_debug("  node %s :\n", path);
-- 
2.11.0