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From:   youling 257 <youling257@gmail.com>
Date:   Thu, 20 Oct 2022 03:29:01 +0800
Message-ID: <CAOzgRdbbVWTWR0r4y8u5nLUeANA7bU-o5JxGCHQ3r7Ht+TCg1Q@mail.gmail.com>
Subject: Re: [PATCH v7 18/43] instrumented.h: add KMSAN support
To:     Marco Elver <elver@google.com>
Cc:     Alexander Viro <viro@zeniv.linux.org.uk>,
        Alexei Starovoitov <ast@kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Andrey Konovalov <andreyknvl@google.com>,
        Andy Lutomirski <luto@kernel.org>,
        Arnd Bergmann <arnd@arndb.de>, Borislav Petkov <bp@alien8.de>,
        Christoph Hellwig <hch@lst.de>,
        Christoph Lameter <cl@linux.com>,
        David Rientjes <rientjes@google.com>,
        Dmitry Vyukov <dvyukov@google.com>,
        Eric Biggers <ebiggers@kernel.org>,
        Eric Dumazet <edumazet@google.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Herbert Xu <herbert@gondor.apana.org.au>,
        Ilya Leoshkevich <iii@linux.ibm.com>,
        Ingo Molnar <mingo@redhat.com>, Jens Axboe <axboe@kernel.dk>,
        Joonsoo Kim <iamjoonsoo.kim@lge.com>,
        Kees Cook <keescook@chromium.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Matthew Wilcox <willy@infradead.org>,
        "Michael S. Tsirkin" <mst@redhat.com>,
        Pekka Enberg <penberg@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Petr Mladek <pmladek@suse.com>,
        Stephen Rothwell <sfr@canb.auug.org.au>,
        Steven Rostedt <rostedt@goodmis.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Vasily Gorbik <gor@linux.ibm.com>,
        Vegard Nossum <vegard.nossum@oracle.com>,
        Vlastimil Babka <vbabka@suse.cz>, kasan-dev@googlegroups.com,
        linux-mm@kvack.org, linux-arch@vger.kernel.org,
        linux-kernel@vger.kernel.org
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arch x86, this's my revert,
https://github.com/youling257/android-mainline/commit/401cbfa61cbfc20c87a5b=
e8e2dda68ac5702389f
i tried different revert, have to remove kmsan_copy_to_user.

2022-10-20 1:58 GMT+08:00, Marco Elver <elver@google.com>:
> On Wed, 19 Oct 2022 at 10:37, youling 257 <youling257@gmail.com> wrote:
>>
>>
>>
>> ---------- Forwarded message ---------
>> =E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A youling257 <youling257@gmail.com>
>> Date: 2022=E5=B9=B410=E6=9C=8820=E6=97=A5=E5=91=A8=E5=9B=9B =E4=B8=8A=E5=
=8D=881:36
>> Subject: Re: [PATCH v7 18/43] instrumented.h: add KMSAN support
>> To: <glider@google.com>
>> Cc: <youling257@gmail.com>
>>
>>
>> i using linux kernel 6.1rc1 on android, i use gcc12 build kernel 6.1 for
>> android, CONFIG_KMSAN is not set.
>> "instrumented.h: add KMSAN support" cause android bluetooth high CPU
>> usage.
>> git bisect linux kernel 6.1rc1, "instrumented.h: add KMSAN support" is a
>> bad commit for my android.
>>
>> this is my kernel 6.1,  revert include/linux/instrumented.h fix high cpu
>> usage problem.
>> https://github.com/youling257/android-mainline/commits/6.1
>
> What arch?
> If x86, can you try to revert only the change to
> instrument_get_user()? (I wonder if the u64 conversion is causing
> issues.)
>