From: Martin Schwidefsky <schwidefsky@de.ibm.com>
Date: Wed, 13 Jan 2010 19:44:26 +0000 (+0100)
Subject: [S390] clear TIF_SINGLE_STEP for new process.
X-Git-Tag: v2.6.33-rc5~70^2~18
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=f8d5faf718c9ff2c04eb8484585d4963c4111cd7;p=karo-tx-linux.git

[S390] clear TIF_SINGLE_STEP for new process.

Clear the TIF_SINGLE_STEP bit in copy_thread. The new process did not get
a PER event of its own. It is wrong deliver a SIGTRAP that was meant for
the parent process.

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

diff --git a/arch/s390/kernel/process.c b/arch/s390/kernel/process.c
index 5417eb57271a..b98fe8e6e507 100644
--- a/arch/s390/kernel/process.c
+++ b/arch/s390/kernel/process.c
@@ -217,6 +217,7 @@ int copy_thread(unsigned long clone_flags, unsigned long new_stackp,
 	p->thread.mm_segment = get_fs();
 	/* Don't copy debug registers */
 	memset(&p->thread.per_info, 0, sizeof(p->thread.per_info));
+	clear_tsk_thread_flag(p, TIF_SINGLE_STEP);
 	/* Initialize per thread user and system timer values */
 	ti = task_thread_info(p);
 	ti->user_timer = 0;