On Thu, 2023-01-19 at 16:09 -0700, Jens Axboe wrote: > > I guess we need to twiddle that asm to deal with eg 16 bits, rather than > attempt to backport any TIF removal patches. Hm, 'mov' gets past the weird ass rules committee, so seems it should be trivial for someone who speaks arm. This built/booted once on rpi4. diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S index d5bc1dbdd2fd..a4931bff8ea9 100644 --- a/arch/arm64/kernel/entry.S +++ b/arch/arm64/kernel/entry.S @@ -751,7 +760,12 @@ SYM_CODE_START_LOCAL(ret_to_user) bl trace_hardirqs_off #endif ldr x19, [tsk, #TSK_TI_FLAGS] +#ifndef CONFIG_PREEMPT_RT and x2, x19, #_TIF_WORK_MASK +#else + mov x2, #_TIF_WORK_MASK + and x2, x19, x2 +#endif cbnz x2, work_pending finish_ret_to_user: user_enter_irqoff
