linux-kernel - [PATCH 4/4] ptrace: remove PT

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Date:	Thu, 23 Apr 2009 21:32:15 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Roland McGrath <roland@...hat.com>
Cc:	Chris Zankel <chris@...kel.net>,
	David Howells <dhowells@...hat.com>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Greg Ungerer <gerg@...inux.org>,
	Haavard Skinnemoen <hskinnemoen@...el.com>,
	Helge Deller <deller@....de>,
	Hirokazu Takata <takata@...ux-m32r.org>,
	Jeff Dike <jdike@...toit.com>,
	Kyle McMartin <kyle@...artin.ca>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Mike Frysinger <vapier.adi@...il.com>,
	Paul Mundt <lethal@...ux-sh.org>,
	Roman Zippel <zippel@...ux-m68k.org>,
	Yoshinori Sato <ysato@...rs.sourceforge.jp>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 4/4] ptrace: remove PT_DTRACE from arch/m32r

m32r: PTRACE_SINGLESTEP sets PT_DTRACE, it is never used except cleared
after do_execve().

Signed-off-by: Oleg Nesterov <oleg@...hat.com>

 arch/m32r/kernel/process.c |    5 -----
 arch/m32r/kernel/ptrace.c  |    4 ----
 2 files changed, 9 deletions(-)

--- PTRACE/arch/m32r/kernel/process.c~DT_4_m32r	2009-04-06 00:03:35.000000000 +0200
+++ PTRACE/arch/m32r/kernel/process.c	2009-04-22 22:01:44.000000000 +0200
@@ -302,11 +302,6 @@ asmlinkage int sys_execve(char __user *u
 		goto out;
 
 	error = do_execve(filename, uargv, uenvp, &regs);
-	if (error == 0) {
-		task_lock(current);
-		current->ptrace &= ~PT_DTRACE;
-		task_unlock(current);
-	}
 	putname(filename);
 out:
 	return error;
--- PTRACE/arch/m32r/kernel/ptrace.c~DT_4_m32r	2009-04-06 00:03:35.000000000 +0200
+++ PTRACE/arch/m32r/kernel/ptrace.c	2009-04-22 22:00:13.000000000 +0200
@@ -676,10 +676,6 @@ arch_ptrace(struct task_struct *child, l
 		if (!valid_signal(data))
 			break;
 		clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
-		if ((child->ptrace & PT_DTRACE) == 0) {
-			/* Spurious delayed TF traps may occur */
-			child->ptrace |= PT_DTRACE;
-		}
 
 		/* Compute next pc.  */
 		pc = get_stack_long(child, PT_BPC);

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