Re: [PATCH v4 1/7] riscv: asm: alternative-macros: Introduce ALTERNATIVE_3() macro

[Heiko Stübner]

Am Freitag, 25. November 2022, 11:02:21 CET schrieb Lad, Prabhakar:
> Hi Heiko,
> 
> On Thu, Nov 24, 2022 at 7:58 PM Heiko Stübner <heiko@xxxxxxxxx> wrote:
> >
> > Am Donnerstag, 24. November 2022, 20:52:33 CET schrieb Conor Dooley:
> > > On Thu, Nov 24, 2022 at 05:22:01PM +0000, Prabhakar wrote:
> > > > From: Lad Prabhakar <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx>
> > > >
> > > > Introduce ALTERNATIVE_3() macro.
> > >
> > > Bit perfunctory I think! There's a lovely comment down below that would
> > > make for a better commit message if you were to yoink it.
> > > Content looks about what I'd expect to see though.
> >
> > Also both the comment on the original ALTERNATIVE_2 and the new ALTERNATIVE_3
> > should probably be merged into a single comment explaining this once for all
> > ALTERNATIVE_x variants.
> >
> > Especially with the dma stuff, I'm pretty sure we'll get at least an ALTERNATIVE_4
> > if not even more ;-) . So we defnitly don't want to repeat this multiple times.
> >
> Do agree. How about the below?
> 
> /*
>  * Similar to what ALTERNATIVE_2() macro does but with an additional
>  * vendor content.
>  */
> 
> So the other ALTERNATIVE_2+() macros will keep on building on it.

My idea was more like having _one_ comment block of something like

-----
/*
 * ALTERNATIVE_x macros allow providing multiple replacement options
 * for an ALTERNATIVE code section. This is helpful if multiple
 * implementation variants for the same functionality exist for
 * different cpu cores.
 *
 * Usage:
 *   ALTERNATIVE_x(old_content,
 *	new_content1, vendor_id1, errata_id1, CONFIG_k1,
 *	new_content2, vendor_id2, errata_id2, CONFIG_k2,
 *	...
 *	new_contentx, vendor_idx, errata_idx, CONFIG_kx)
 */

#define ALTERNATIVE_2(...)
#define ALTERNATIVE_3(...)
etc
-----

So this would include dropping the old comment over ALTERNATIVE2


Heiko