On Wed, Jul 31, 2024 at 06:03:11PM +0800, Jinjie Ruan wrote: > On 2024/7/31 16:24, Russell King (Oracle) wrote: > > On Wed, Jul 31, 2024 at 10:07:53AM +0800, Jinjie Ruan wrote: > >>> #ifdef CONFIG_PREEMPTION > >>> +#ifdef CONFIG_PREEMPT_DYNAMIC > >>> + bl need_irq_preemption > >>> + cmp r0, #0 > >>> + beq 2f > >>> +#endif > > > > Depending on the interrupt rate, this can be regarded as a fast path, > > it would be nice if we could find a way to use static branches in > > assembly code. > It seems to be hard to use static keys in assembly code. > > By the way, currently, most architectures have simplified assembly code > and implemented its most functions in C functions. Does arm32 have this > plan? arm32 is effectively in maintenance mode; very little active development is occuring. So, there are no plans to change the code without good reason (as code changes without reason will needlessly affect its stability.) -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!
