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static inline void gic_arch_restore_irqs(unsigned long flags)
{
if (gic_supports_nmi())
asm volatile ("msr daif, %0" : : "r" (flags >> 32)
: "memory");
}
当前flags的高32位恒为0，该函数并没有实现根据flags恢复中断状态，而是强制把daif都打开了。
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Wei Li
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The gic_arch_restore_irqs() depends on commit e7e6a881f797 ("arm64:
irqflags: fix incomplete save & restore"). While it is reverted in commit
2e680920c2e7 ("Revert "arm64: irqflags: fix incomplete save & restore""),
and backported the upstreamed fix patches later：
680d0f96393c arm64: Lower priority mask for GIC_PRIO_IRQON
a6df44e97db2 arm64: irqflags: Introduce explicit debugging for IRQ priorities
a80102bd22af arm64: Fix incorrect irqflag restore for priority masking
8b1d3c9e913c arm64: Fix interrupt tracing in the presence of NMIs
So we should update the logic here：
Currently the upper 32 bits of 'flags' is always zero, change to use
'GIC_PRIO_PSR_I_SET' to indicate the interrupt enabling status.
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