Please pull powerpc.git merge branch

[Paul Mackerras]

Linus,

Please do

git pull \
git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc.git merge

to get a patch from Roland McGrath that fixes a user-triggerable oops
on 64-bit powerpc.

Thanks,
Paul.

 arch/powerpc/kernel/process.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

commit 474f81967217f3bec2389ae913da72641f2c40e3
Author: Roland McGrath <roland at redhat.com>
Date:   Mon Sep 24 16:52:44 2007 -0700

    [POWERPC] Ensure FULL_REGS on exec
    
    When PTRACE_O_TRACEEXEC is used, a ptrace call to fetch the registers at
    the PTRACE_EVENT_EXEC stop (PTRACE_PEEKUSR) will oops in CHECK_FULL_REGS.
    With recent versions, "gdb --args /bin/sh -c 'exec /bin/true'" and "run" at
    the (gdb) prompt is sufficient to produce this.  I also have written an
    isolated test case, see https://bugzilla.redhat.com/show_bug.cgi?id=301791#c15.
    
    This change fixes the problem by clearing the low bit of pt_regs.trap in
    start_thread so that FULL_REGS is true again.  This is correct since all of
    the GPRs that "full" refers to are cleared in start_thread.
    
    Signed-off-by: Roland McGrath <roland at redhat.com>
    Signed-off-by: Paul Mackerras <paulus at samba.org>