linux-kernel - Re: [PATCH v4 0/7] arm64: untag user pointers passed to the kernel

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Message-ID: <CAAeHK+zqVTOSFD5yZ0E5Z3HZPVn8KYQJMGjBvin8rEfugBdfag@mail.gmail.com>
Date:   Fri, 3 Aug 2018 18:54:57 +0200
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Mark Rutland <mark.rutland@....com>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        linux-doc@...r.kernel.org, Will Deacon <will.deacon@....com>,
        Kostya Serebryany <kcc@...gle.com>,
        linux-kselftest@...r.kernel.org,
        Chintan Pandya <cpandya@...eaurora.org>,
        Shuah Khan <shuah@...nel.org>, Ingo Molnar <mingo@...nel.org>,
        linux-arch@...r.kernel.org, Jacob Bramley <Jacob.Bramley@....com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Evgeniy Stepanov <eugenis@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        Ruben Ayrapetyan <Ruben.Ayrapetyan@....com>,
        Ramana Radhakrishnan <Ramana.Radhakrishnan@....com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Lee Smith <Lee.Smith@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Robin Murphy <robin.murphy@....com>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: Re: [PATCH v4 0/7] arm64: untag user pointers passed to the kernel

On Fri, Aug 3, 2018 at 6:43 PM, Matthew Wilcox <willy@...radead.org> wrote:
> On Fri, Aug 03, 2018 at 05:09:45PM +0200, Greg Kroah-Hartman wrote:
>> On Fri, Aug 03, 2018 at 04:59:18PM +0200, Andrey Konovalov wrote:
>> > Started looking at this. When I run sparse with default checks enabled
>> > (make C=1) I get countless warnings. Does anybody actually use it?
>>
>> Try using a more up-to-date version of sparse.  Odds are you are using
>> an old one, there is a newer version in a different branch on kernel.org
>> somewhere...
>
> That's not true.  Building the current version of sparse from
> git://git.kernel.org/pub/scm/devel/sparse/sparse.git leaves me with a
> thousand errors just building the mm/ directory.  A sample:

I'm running the one from https://github.com/lucvoo/sparse-dev which
seems to be even more up to date. Defconfig on x86 gives me ~3000
warnings:

https://gist.github.com/xairy/8adace989f64462e18ffb5cb7d096b73