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irqchip/gic-v3: Use nops macro for Cavium ThunderX erratum 23154

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The workaround for Cavium ThunderX erratum 23154 has a homebrew
pipeflush built out of NOP sequences around the read of the IAR.

This patch converts the code to use the new nops macro, which makes it
a little easier to read.

Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Will Deacon 2016-10-28 12:23:58 +01:00 committed by Marc Zyngier
parent d44ffa5ae7
commit 016f98afd0
1 changed files with 2 additions and 7 deletions
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9
arch/arm64/include/asm/arch_gicv3.h
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@ -122,14 +122,9 @@ static inline u64 gic_read_iar_cavium_thunderx(void)
{ {
u64 irqstat; u64 irqstat;
asm volatile( nops(8);
"nop;nop;nop;nop\n\t"
"nop;nop;nop;nop");
irqstat = read_sysreg_s(ICC_IAR1_EL1); irqstat = read_sysreg_s(ICC_IAR1_EL1);
nops(4);
asm volatile(
"nop;nop;nop;nop");
mb(); mb();
return irqstat; return irqstat;