linux-kernel - Re: [PATCH] x86_64,kgdb: add default case into a switch

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Message-ID: <4CEA80AD.2030804@windriver.com>
Date:	Mon, 22 Nov 2010 08:39:41 -0600
From:	Jason Wessel <jason.wessel@...driver.com>
To:	Namhyung Kim <namhyung@...il.com>
CC:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86_64,kgdb: add default case into a switch

On 11/22/2010 01:02 AM, Namhyung Kim wrote:
> This fixes following sparse warning on x86_64:
> 
>  arch/x86/kernel/kgdb.c:123:9: warning: switch with no cases
> 

Thanks for the report on this.  

The preferred fix for the warning is below, and I'll queue it for the 2.6.38 merge window.

Thanks,
Jason.

--

From: Jason Wessel <jason.wessel@...driver.com>
Subject: [PATCH] kgdb,x86_64: fix compile warning found with sparse
Date: Mon Nov 22 08:38:04 CST 2010

Fix sparse warning:

arch/x86/kernel/kgdb.c:123:9: warning: switch with no cases

Reported-by: Namhyung Kim <namhyung@...il.com>
Signed-off-by: Jason Wessel <jason.wessel@...driver.com>

---
 arch/x86/kernel/kgdb.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/arch/x86/kernel/kgdb.c
+++ b/arch/x86/kernel/kgdb.c
@@ -120,8 +120,8 @@ char *dbg_get_reg(int regno, void *mem, 
 		memcpy(mem, (void *)regs + dbg_reg_def[regno].offset,
 		       dbg_reg_def[regno].size);
 
-	switch (regno) {
 #ifdef CONFIG_X86_32
+	switch (regno) {
 	case GDB_SS:
 		if (!user_mode_vm(regs))
 			*(unsigned long *)mem = __KERNEL_DS;
@@ -134,8 +134,8 @@ char *dbg_get_reg(int regno, void *mem, 
 	case GDB_FS:
 		*(unsigned long *)mem = 0xFFFF;
 		break;
-#endif
 	}
+#endif
 	return dbg_reg_def[regno].name;
 }
 
--
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