Re: [PATCH v2 1/2] MIPS: SGI-IP27: micro-optimize arch_init_irq()

[Yury Norov]

On Wed, Apr 17, 2024 at 01:10:52PM +0200, Thomas Bogendoerfer wrote:
> On Tue, Apr 16, 2024 at 10:37:10AM -0700, Yury Norov wrote:
> > The function sets adjusted groups of bits in hub_irq_map by using
> > for-loops. There's a bitmap_set() function dedicated to do this.
> > 
> > Because [0, CPU_CALL_B_IRQ] and [NI_BRDCAST_ERR_A, MSC_PANIC_INTR]
> > ranges belong to the same machine word, bitmap_set() would boil down
> > to an inline wrapper in both cases, avoiding generating a loop, with
> > the associate overhead. Effectively, it would be a compile-time:
> > 
> > 	*hub_irq_map = GENMASK() | GENMASK();
> > 
> > Signed-off-by: Yury Norov <yury.norov@xxxxxxxxx>
> > ---
> >  arch/mips/sgi-ip27/ip27-irq.c | 8 ++------
> >  1 file changed, 2 insertions(+), 6 deletions(-)
> > 
> > diff --git a/arch/mips/sgi-ip27/ip27-irq.c b/arch/mips/sgi-ip27/ip27-irq.c
> > index 8f5299b269e7..d8acdf0439d2 100644
> > --- a/arch/mips/sgi-ip27/ip27-irq.c
> > +++ b/arch/mips/sgi-ip27/ip27-irq.c
> > @@ -277,7 +277,6 @@ void __init arch_init_irq(void)
> >  {
> >  	struct irq_domain *domain;
> >  	struct fwnode_handle *fn;
> > -	int i;
> 
> I've already applied your first version, so I need an incremental
> patch, which just removes the unused variable.

Sure, please find below.