[PARISC] Add sync required after fdc to enforce insn ordering

PA20 arch book (page 7-52 and 7-55) indicate a "sync" is required after
the FDC "to enforce instruction ordering". And we want to make
sure FIC is executed after FDC has retired.

Signed-off-by: Grant Grundler <grundler@parisc-linux.org>

Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/arch/parisc/kernel/signal.c b/arch/parisc/kernel/signal.c
index 0224651fd8f1..6c905c128c2a 100644
--- a/arch/parisc/kernel/signal.c
+++ b/arch/parisc/kernel/signal.c
@@ -636,6 +636,7 @@ do_signal(sigset_t *oldset, struct pt_regs *regs, int in_syscall)
                         /* Stack is 64-byte aligned, and we only 
                          * need to flush 1 cache line */
                         asm("fdc 0(%%sr3, %0)\n"
+                            "sync\n"
                             "fic 0(%%sr3, %0)\n"
                             "sync\n"
                             : : "r"(regs->gr[30]));