lkml.org 
[lkml]   [2023]   [Jan]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH -next] cacheinfo: Correctly handle new acpi_get_cache_info() prototype
On Tue, Jan 24, 2023 at 01:31:06PM +0000, Conor Dooley wrote:
> Hey!
>
> On Tue, Jan 24, 2023 at 01:34:46PM +0100, Pierre Gondois wrote:
> > commit bd500361a937 ("ACPI: PPTT: Update acpi_find_last_cache_level()
> > to acpi_get_cache_info()")
> > updates the function acpi_get_cache_info().
> >
> > If CONFIG_ACPI_PPTT is not defined, acpi_get_cache_info() doesn't
> > update its *levels and *split_levels parameters and returns 0.
> > This can lead to a faulty behaviour.
> >
> > Make acpi_get_cache_info() return an error code if CONFIG_ACPI_PPTT
> > is not defined. Initialize levels and split_levels before passing
> > their address to acpi_get_cache_info().
> >
> > Also, in init_cache_level():
>
> Hmm...
>
> > - commit e75d18cecbb3 ("arm64: cacheinfo: Fix incorrect
> > assignment of signed error value to unsigned fw_level")
> > checks the fw_level value in init_cache_level() in case
> > the value is negative. Remove this check as the error code
> > is not returned through fw_level anymore.
> > - if no PPTT is present or CONFIG_ACPI_PPTT is not defined,
> > it is still possible to use the cache information from clidr_el1.
> > Instead of aborting if acpi_get_cache_info() returns an error
> > code, just continue.
>
> To be honest, these feel like entirely separate things that should be
> in different patches. You've got:
> - Dan's smatch fixes
> - a redundant check being removed
> - a behaviour change for if acpi_get_cache_info() returns an error
>

I am not too fussy about it, but for sure it would be cleaner for sure.

> > Reported-by: Dan Carpenter <error27@gmail.com>
> > Reported-by: kernel test robot <lkp@intel.com>
>
> How about Link: to the LKP/Dan's report?
> Link: https://lore.kernel.org/all/Y86iruJPuwNN7rZw@kili/
>
> I did a quick check but didn't don't see the LKP report...
>

Yes, LKP dropped all the cc when reported, even I saw after merging the
changes. I think this is the one:

https://lore.kernel.org/all/202301052307.JYt1GWaJ-lkp@intel.com/

> Also a Fixes: tag too, no?
>

+1, if you split make sure you tag fixes to the right one(mainly one
that changes return from acpi_get_cache_info())

> Thanks,
> Conor.



--
Regards,
Sudeep

\
 
 \ /
  Last update: 2023-03-26 23:54    [W:0.094 / U:0.084 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site