[PATCH] Set TIF_IRET in more places

[Luca Barbieri]

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This patch adds code to set TIF_IRET in sigsuspend and rt_sigsuspend
(since they change registers to invoke signal handlers) and ptrace
setregs.  This prevents clobbering of %ecx and %edx.

diff --exclude-from=3D/home/ldb/src/exclude -urNdp --exclude=3D'speedtouch.=
*' --exclude=3D'atmsar.*' linux-2.5.54/arch/i386/kernel/ptrace.c linux-2.5.=
54-ldb/arch/i386/kernel/ptrace.c
--- linux-2.5.54/arch/i386/kernel/ptrace.c	2003-01-02 04:21:29.000000000 +0=
100
+++ linux-2.5.54-ldb/arch/i386/kernel/ptrace.c	2003-01-04 19:06:07.00000000=
0 +0100
@@ -74,6 +74,8 @@ static inline int put_stack_long(struct=20
 static int putreg(struct task_struct *child,
 	unsigned long regno, unsigned long value)
 {
+	set_tsk_thread_flag(child, TIF_IRET);
+
 	switch (regno >> 2) {
 		case FS:
 			if (value && (value & 3) !=3D 3)
diff --exclude-from=3D/home/ldb/src/exclude -urNdp --exclude=3D'speedtouch.=
*' --exclude=3D'atmsar.*' linux-2.5.54/arch/i386/kernel/signal.c linux-2.5.=
54-ldb/arch/i386/kernel/signal.c
--- linux-2.5.54/arch/i386/kernel/signal.c	2003-01-02 04:21:53.000000000 +0=
100
+++ linux-2.5.54-ldb/arch/i386/kernel/signal.c	2003-01-04 19:06:07.00000000=
0 +0100
@@ -44,6 +44,7 @@ sys_sigsuspend(int history0, int history
 	spin_unlock_irq(&current->sig->siglock);
=20
 	regs->eax =3D -EINTR;
+	set_thread_flag(TIF_IRET);
 	while (1) {
 		current->state =3D TASK_INTERRUPTIBLE;
 		schedule();
@@ -73,6 +74,7 @@ sys_rt_sigsuspend(sigset_t *unewset, siz
 	spin_unlock_irq(&current->sig->siglock);
=20
 	regs->eax =3D -EINTR;
+	set_thread_flag(TIF_IRET);=09
 	while (1) {
 		current->state =3D TASK_INTERRUPTIBLE;
 		schedule();

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