Re: [PATCH v3 0/3] nolibc: add part2 of support for rv32

From: Willy Tarreau <w@1wt.eu>
To: Zhangjin Wu <falcon@tinylab.org>
Cc: arnd@arndb.de, linux-kernel@vger.kernel.org,
	linux-kselftest@vger.kernel.org, linux-riscv@lists.infradead.org,
	thomas@t-8ch.de
Subject: Re: [PATCH v3 0/3] nolibc: add part2 of support for rv32
Date: Tue, 6 Jun 2023 08:45:32 +0200	[thread overview]
Message-ID: <ZH7WDDgACvzVzV6e@1wt.eu> (raw)
In-Reply-To: <20230606063421.355411-1-falcon@tinylab.org>

On Tue, Jun 06, 2023 at 02:34:21PM +0800, Zhangjin Wu wrote:
> Willy, Thomas, Arnd
> 
> > Hi Zhangjin,
> > 
> > On Tue, Jun 06, 2023 at 12:25:35PM +0800, Zhangjin Wu wrote:
> > > The first two convert all compile failures to a return of -ENOSYS, if you do
> > > like it, welcome your Reviewed-by. These two are required by the coming new
> > > time64 syscalls for rv32, because they depends on how we cope with the
> > > unsupported syscalls, returning -ENOSYS is really better than simply fail the
> > > compiling.
> > 
> > I had a look now and I can sya that I like this. Initially the supported
> > syscalls were so restricted that it was not even imaginable to accept to
> > build without any of them, but now that we're completing the list, some
> > of them are less critical and I don't see why we'd fail to build just
> > because one is missing. So yeah, a big +1 for -ENOSYS.
> >
> 
> Cool, I will prepare the new patchsets on them, welcome your new branch
> with both of them, of course, still weclome Reviewed-by from Arnd and Thomas.

I don't even think a new branch is needed, I can take them as-is it seems.

> > > The third one is not that urgent, because some important syscalls are
> > > still missing for rv32. It is added here only for compile test.
> > 
> > I personally have no opinion on this one. I can't judge whether it will
> > make things easier or more complicated at this point. It seems to me
> > that for now it's just avoiding one extra line at the expense of some
> > $(if) on several lines. Maybe it could help add more such archs, or
> > maybe it can make them more complicated to debug, I don't know. I'm
> > interested in others' opinions as well.
> 
> As I explained why we did it in current way in this reply [1], Thomas had no
> more questions on it, so I think Thomas was happy with it now and I got his
> only left suggestion is that may be this patch should be applied after the
> missing 64bit syscalls being added for there are several important test
> failures currently, for me, it is ok before or after.
> 
> Thomas, welcome your Reviewed-by on the makefile patch itself If you are really
> happy with it now, thanks very much ;-)
> 
> Willy, I will send the v2 syscalls helpers (also required by the coming 64bit
> syscalls) and some other patches (mainly for test with faster kernel build)
> about selftests/nolibc later, because we have not enough time for v6.5 test,
> so, I suggest we can create new branch for v6.6 and my new patchsets will be
> for v6.6.

Agreed, thank you!
Willy