x86: use wrmsrl in kprobes.c, step.c

Where x86_32 passed zero in the high 32 bits, use wrmsrl which will zero extend for us. This allows ifdefs for 32/64 bit to be eliminated. Eliminate ifdef in step.c. Similar cleanup was done when unifying kprobes_32|64.c and wrmsr() was chosen there over wrmsrl(). This patch changes these to wrmsrl. Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
git-mirror · Jan 30, 2008 · f13bd3e · f13bd3e
1 parent e8c10ef
commit f13bd3e
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diff --git a/arch/x86/kernel/kprobes.c b/arch/x86/kernel/kprobes.c
@@ -410,13 +410,13 @@ static void __kprobes set_current_kprobe(struct kprobe *p, struct pt_regs *regs,
 static void __kprobes clear_btf(void)
 {
 	if (test_thread_flag(TIF_DEBUGCTLMSR))
-		wrmsr(MSR_IA32_DEBUGCTLMSR, 0, 0);
+		wrmsrl(MSR_IA32_DEBUGCTLMSR, 0);
 }
 
 static void __kprobes restore_btf(void)
 {
 	if (test_thread_flag(TIF_DEBUGCTLMSR))
-		wrmsr(MSR_IA32_DEBUGCTLMSR, current->thread.debugctlmsr, 0);
+		wrmsrl(MSR_IA32_DEBUGCTLMSR, current->thread.debugctlmsr);
 }
 
 static void __kprobes prepare_singlestep(struct kprobe *p, struct pt_regs *regs)

diff --git a/arch/x86/kernel/step.c b/arch/x86/kernel/step.c
@@ -229,11 +229,7 @@ static void write_debugctlmsr(struct task_struct *child, unsigned long val)
 	if (child != current)
 		return;
 
-#ifdef CONFIG_X86_64
 	wrmsrl(MSR_IA32_DEBUGCTLMSR, val);
-#else
-	wrmsr(MSR_IA32_DEBUGCTLMSR, val, 0);
-#endif
 }
 
 /*