sh: Optimize the setup_rt_frame() I-cache flush.

This only needs to flush the return code via the legacy path, and just
invalidates uselessly otherwise. This makes the behaviour consistent for
all of the trampoline setup paths.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

diff --git a/arch/sh/kernel/signal_32.c b/arch/sh/kernel/signal_32.c
index 55d1f814e343653a8dcb1aec79f5a986bf142652..3db37425210dc79c682c1af1c5ca2ddc9fc20e40 100644 (file)
--- a/arch/sh/kernel/signal_32.c
+++ b/arch/sh/kernel/signal_32.c
@@ -472,6 +472,7 @@ static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
                err |= __put_user(OR_R0_R0, &frame->retcode[6]);
                err |= __put_user((__NR_rt_sigreturn), &frame->retcode[7]);
                regs->pr = (unsigned long) frame->retcode;
+               flush_icache_range(regs->pr, regs->pr + sizeof(frame->retcode));
        }
 
        if (err)
@@ -497,8 +498,6 @@ static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
        pr_debug("SIG deliver (%s:%d): sp=%p pc=%08lx pr=%08lx\n",
                 current->comm, task_pid_nr(current), frame, regs->pc, regs->pr);
 
-       flush_icache_range(regs->pr, regs->pr + sizeof(frame->retcode));
-
        return 0;
 
 give_sigsegv: