tile: fix "odd fault" warning for stack backtraces

We were setting ex1 in new kernel threads to KERNEL_PL.
But since we just do a simple context-switch, not an iret,
any value set here is ignored anyway, and its presence causes
stack backtraces to end with a warning about an "odd fault".

Signed-off-by: Chris Metcalf <cmetcalf@ezchip.com>

diff --git a/arch/tile/kernel/process.c b/arch/tile/kernel/process.c
index 0dddcf7..96ea75e 100644 (file)
--- a/arch/tile/kernel/process.c
+++ b/arch/tile/kernel/process.c
@@ -133,7 +133,6 @@ int copy_thread(unsigned long clone_flags, unsigned long sp,
                       (CALLEE_SAVED_REGS_COUNT - 2) * sizeof(unsigned long));
                callee_regs[0] = sp;   /* r30 = function */
                callee_regs[1] = arg;  /* r31 = arg */
                       (CALLEE_SAVED_REGS_COUNT - 2) * sizeof(unsigned long));
                callee_regs[0] = sp;   /* r30 = function */
                callee_regs[1] = arg;  /* r31 = arg */

-               childregs->ex1 = PL_ICS_EX1(KERNEL_PL, 0);

                p->thread.pc = (unsigned long) ret_from_kernel_thread;
                return 0;
        }
                p->thread.pc = (unsigned long) ret_from_kernel_thread;
                return 0;
        }