From: Martin Schwidefsky <schwidefsky@de.ibm.com>
Date: Wed, 13 Jan 2010 19:44:25 +0000 (+0100)
Subject: [S390] fix loading of PER control registers for utrace.
X-Git-Tag: 2.1b_release~9667^2~19
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=c3311c13adc1021e986fef12609ceb395ffc5014;p=platform%2Fkernel%2Fkernel-mfld-blackbay.git

[S390] fix loading of PER control registers for utrace.

If the current task enables / disables PER tracing for itself the
PER control registers need to be loaded in FixPerRegisters.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
---

diff --git a/arch/s390/kernel/ptrace.c b/arch/s390/kernel/ptrace.c
index 13815d3..7cf4642 100644
--- a/arch/s390/kernel/ptrace.c
+++ b/arch/s390/kernel/ptrace.c
@@ -65,6 +65,7 @@ FixPerRegisters(struct task_struct *task)
 {
 	struct pt_regs *regs;
 	per_struct *per_info;
+	per_cr_words cr_words;
 
 	regs = task_pt_regs(task);
 	per_info = (per_struct *) &task->thread.per_info;
@@ -98,6 +99,13 @@ FixPerRegisters(struct task_struct *task)
 		per_info->control_regs.bits.storage_alt_space_ctl = 1;
 	else
 		per_info->control_regs.bits.storage_alt_space_ctl = 0;
+
+	if (task == current) {
+		__ctl_store(cr_words, 9, 11);
+		if (memcmp(&cr_words, &per_info->control_regs.words,
+			   sizeof(cr_words)) != 0)
+			__ctl_load(per_info->control_regs.words, 9, 11);
+	}
 }
 
 void user_enable_single_step(struct task_struct *task)