linux-kernel - Re: [PATCH v3] bitfield.h: add FIELD_MAX() and field

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Date:   Wed, 1 Apr 2020 13:24:14 -0500
From:   Alex Elder <elder@...aro.org>
To:     Nick Desaulniers <ndesaulniers@...gle.com>,
        Maxim Kuvyrkov <maxim.kuvyrkov@...aro.org>
Cc:     arnd@...db.de, bjorn.andersson@...aro.org, davem@...emloft.net,
        johannes@...solutions.net, kuba@...nel.org,
        linux-kernel@...r.kernel.org, masahiroy@...nel.org,
        natechancellor@...il.com, netdev@...r.kernel.org,
        viro@...iv.linux.org.uk
Subject: Re: [PATCH v3] bitfield.h: add FIELD_MAX() and field_max()

On 4/1/20 12:35 PM, Nick Desaulniers wrote:
>> Define FIELD_MAX(), which supplies the maximum value that can be
>> represented by a field value.  Define field_max() as well, to go
>> along with the lower-case forms of the field mask functions.
>>
>> Signed-off-by: Alex Elder <elder@...aro.org>
>> Acked-by: Jakub Kicinski <kuba@...nel.org>
>> ---
>> v3: Rebased on latest netdev-next/master.
>>
>> David, please take this into net-next as soon as possible.  When the
>> IPA code was merged the other day this prerequisite patch was not
>> included, and as a result the IPA driver fails to build.  Thank you.
>>
>>   See: https://lkml.org/lkml/2020/3/10/1839
>>
>> 					-Alex
> 
> In particular, this seems to now have regressed into mainline for the 5.7
> merge window as reported by Linaro's ToolChain Working Group's CI.
> Link: https://github.com/ClangBuiltLinux/linux/issues/963

Is the problem you're referring to the result of a build done
in the midst of a bisect?

The fix for this build error is currently present in the
torvalds/linux.git master branch:
    6fcd42242ebc soc: qcom: ipa: kill IPA_RX_BUFFER_ORDER

I may be mistaken, but I believe this is the same problem I discussed
with Maxim Kuvyrkov this morning.  A different build problem led to
an automated bisect, which conluded this was the cause because it
landed somewhere between the initial pull of the IPA code and the fix
I reference above.

					-Alex