hw-breakpoints: modify signal handling code to refrain from re-enabling HW Breakpoints

This patch disables re-enabling of Hardware Breakpoint registers through
the signal handling code. This is now done during from hw_breakpoint_handler().

Original-patch-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: K.Prasad <prasad@linux.vnet.ibm.com>
Reviewed-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>

1 files changed, 0 insertions, 9 deletions

diff --git a/arch/x86/kernel/signal.c b/arch/x86/kernel/signal.c
index 14425166b8e3..f33d2e0ef095 100644
--- a/arch/x86/kernel/signal.c
+++ b/arch/x86/kernel/signal.c
@@ -800,15 +800,6 @@ static void do_signal(struct pt_regs *regs)
 
         signr = get_signal_to_deliver(&info, &ka, regs, NULL);
         if (signr > 0) {
-                /*
-                 * Re-enable any watchpoints before delivering the
-                 * signal to user space. The processor register will
-                 * have been cleared if the watchpoint triggered
-                 * inside the kernel.
-                 */
-                if (current->thread.debugreg7)
-                        set_debugreg(current->thread.debugreg7, 7);
-
                 /* Whee! Actually deliver the signal.  */
                 if (handle_signal(signr, &info, &ka, oldset, regs) == 0) {
                         /*