linux-kernel - Re: [PATCH] Revert "riscv: Set more data to cacheinfo"

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Date:   Mon, 13 Mar 2023 18:20:34 +0000
From:   Conor Dooley <conor@...nel.org>
To:     Song Shuai <suagrfillet@...il.com>
Cc:     Sudeep Holla <sudeep.holla@....com>, conor.dooley@...rochip.com,
        paul.walmsley@...ive.com, palmer@...belt.com,
        aou@...s.berkeley.edu, pierre.gondois@....com,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Revert "riscv: Set more data to cacheinfo"

On Thu, Mar 09, 2023 at 07:54:45AM +0000, Song Shuai wrote:
> Hi, Conor & Sudeep :
> 
> Sudeep Holla <sudeep.holla@....com> 于2023年3月8日周三 11:35写道：
> >
> > On Wed, Mar 08, 2023 at 02:47:34PM +0800, Song Shuai wrote:
> > > This reverts commit baf7cbd94b5688f167443a2cc3dcea3300132099.
> > >
> > > There are some duplicate cache attributes populations executed
> > > in both ci_leaf_init() and later cache_setup_properties().
> > >
> > > Revert the commit baf7cbd94b56 ("riscv: Set more data to cacheinfo")
> > > to setup only the level and type attributes at this early place.
> > >
> >
> > I had noticed the same and had something similar when we did some rework
> > around for v6.1 merge window. But there were lot of other issues to be
> > addressed at the moment and hence deferred this.
> >
> > So for the change in general, but as Conor responded, it would be good
> > to do some checking to ensure nothing breaks and all the requirements
> > this patch(baf7cbd94b56) addressed are already handled in the core.
> 
> As you suggested, commit (da29dbcda49d "riscv: Add cache information
> in AUX vector")
> in the "Get cache information from userland" series should be checked.
> 
> The commit da29dbcda49d adds the cacheinfo (read from
> ci_cacheinfo(cpu)) in ELF auxiliary vectors,
> so process can fetch the cacheinfo through glibc sysconf() after ELF loading.
> At the same time, the glibc related support was enabled by its commit
> (15b38ffc10 "riscv: Get cache information through sysconf")
> 
> With this reverting patch applied, the output of `getconf -a` looks good
> in Qemu sifive_u machine and rootfs image with glibc-2.35.

If, as I think you're implying, it is unchanged before/after:
Acked-by: Conor Dooley <conor.dooley@...rochip.com>

Thanks,
Conor.

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