linux-kernel - [PATCH 04/21] powerpc: Mark both tmp variables as unused

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Date:   Sun, 25 Feb 2018 18:22:19 +0100
From:   Mathieu Malaterre <malat@...ian.org>
To:     Michael Ellerman <mpe@...erman.id.au>
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Jiri Slaby <jslaby@...e.com>, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org, Mathieu Malaterre <malat@...ian.org>
Subject: [PATCH 04/21] powerpc: Mark both tmp variables as unused

Since the value of `tmp` is never intended to be read, declare both `tmp`
variables as unused. Fix warning (treated as error in W=1):

  CC      arch/powerpc/kernel/signal_32.o
arch/powerpc/kernel/signal_32.c: In function ‘sys_swapcontext’:
arch/powerpc/kernel/signal_32.c:1048:16: error: variable ‘tmp’ set but not used [-Werror=unused-but-set-variable]
  unsigned char tmp;
                ^~~
arch/powerpc/kernel/signal_32.c: In function ‘sys_debug_setcontext’:
arch/powerpc/kernel/signal_32.c:1234:16: error: variable ‘tmp’ set but not used [-Werror=unused-but-set-variable]
  unsigned char tmp;
                ^~~
cc1: all warnings being treated as errors

Signed-off-by: Mathieu Malaterre <malat@...ian.org>
---
 arch/powerpc/kernel/signal_32.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/kernel/signal_32.c b/arch/powerpc/kernel/signal_32.c
index a46de0035214..492f03451877 100644
--- a/arch/powerpc/kernel/signal_32.c
+++ b/arch/powerpc/kernel/signal_32.c
@@ -1045,7 +1045,7 @@ long sys_swapcontext(struct ucontext __user *old_ctx,
 		     struct ucontext __user *new_ctx,
 		     int ctx_size, int r6, int r7, int r8, struct pt_regs *regs)
 {
-	unsigned char tmp;
+	unsigned char tmp __maybe_unused;
 	int ctx_has_vsx_region = 0;
 
 #ifdef CONFIG_PPC64
@@ -1231,7 +1231,7 @@ int sys_debug_setcontext(struct ucontext __user *ctx,
 {
 	struct sig_dbg_op op;
 	int i;
-	unsigned char tmp;
+	unsigned char tmp __maybe_unused;
 	unsigned long new_msr = regs->msr;
 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
 	unsigned long new_dbcr0 = current->thread.debug.dbcr0;
-- 
2.11.0