[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>

[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>
Grant Grundler · Kyle McMartin
1 parent 3aa0862ce7
Showing 1 changed file with 1 additions and 0 deletions Side-by-side Diff
arch/parisc/kernel/signal.c
@@ -636,6 +636,7 @@
 			/* 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]));
...	...	@@ -636,6 +636,7 @@
636	636	/* Stack is 64-byte aligned, and we only
637	637	* need to flush 1 cache line */
638	638	asm("fdc 0(%%sr3, %0)\n"
	639	+ "sync\n"
639	640	"fic 0(%%sr3, %0)\n"
640	641	"sync\n"
641	642	: : "r"(regs->gr[30]));