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[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>
hifive-unleashed-5.1
Grant Grundler 2005-10-21 22:47:40 -04:00 committed by Kyle McMartin
parent 3aa0862ce7
commit 91313d60d8
1 changed files with 1 additions and 0 deletions
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arch/parisc/kernel/signal.c
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@ -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]));