linux-kernel - [PATCH 8/9] x86: remove weird PTR_ERR() in do

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Date:	Sun, 16 Jun 2013 14:12:47 +0930
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	linux-kernel@...r.kernel.org
Cc:	Rusty Russell <rusty@...tcorp.com.au>, x86@...nel.org,
	"K.Prasad" <prasad@...ux.vnet.ibm.com>
Subject: [PATCH 8/9] x86: remove weird PTR_ERR() in do_debug

62edab905 changed the argument to notify_die() from dr6 to &dr6, but weirdly,
used PTR_ERR() to cast it to a long.  Since dr6 is on the stack, this is
an abuse of PTR_ERR().  Cast to long, as per kernel standard.

Cc: x86@...nel.org
Cc: K.Prasad <prasad@...ux.vnet.ibm.com>
Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>
---
 arch/x86/kernel/traps.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
index 772e2a8..9340dfb 100644
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -437,7 +437,7 @@ dotraplinkage void __kprobes do_debug(struct pt_regs *regs, long error_code)
 	/* Store the virtualized DR6 value */
 	tsk->thread.debugreg6 = dr6;
 
-	if (notify_die(DIE_DEBUG, "debug", regs, PTR_ERR(&dr6), error_code,
+	if (notify_die(DIE_DEBUG, "debug", regs, (long)&dr6, error_code,
 							SIGTRAP) == NOTIFY_STOP)
 		goto exit;
 
-- 
1.8.1.2

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