diff options
| -rw-r--r-- | arch/tile/kernel/entry.S | 16 |
1 files changed, 5 insertions, 11 deletions
diff --git a/arch/tile/kernel/entry.S b/arch/tile/kernel/entry.S index c3aa0676ed06..431e9ae60488 100644 --- a/arch/tile/kernel/entry.S +++ b/arch/tile/kernel/entry.S @@ -91,23 +91,17 @@ STD_ENTRY(smp_nap) /* * Enable interrupts racelessly and then nap until interrupted. + * Architecturally, we are guaranteed that enabling interrupts via + * mtspr to INTERRUPT_CRITICAL_SECTION only interrupts at the next PC. * This function's _cpu_idle_nap address is special; see intvec.S. * When interrupted at _cpu_idle_nap, we bump the PC forward 8, and * as a result return to the function that called _cpu_idle(). */ STD_ENTRY(_cpu_idle) - { - lnk r0 - movei r1, KERNEL_PL - } - { - addli r0, r0, _cpu_idle_nap - . - mtspr INTERRUPT_CRITICAL_SECTION, r1 - } + movei r1, 1 + mtspr INTERRUPT_CRITICAL_SECTION, r1 IRQ_ENABLE(r2, r3) /* unmask, but still with ICS set */ - mtspr SPR_EX_CONTEXT_K_1, r1 /* Kernel PL, ICS clear */ - mtspr SPR_EX_CONTEXT_K_0, r0 - iret + mtspr INTERRUPT_CRITICAL_SECTION, zero .global _cpu_idle_nap _cpu_idle_nap: nap |