linux-kernel - Re: [PATCH v7 18/43] instrumented.h: add KMSAN support

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Date:   Thu, 20 Oct 2022 03:29:01 +0800
From:   youling 257 <youling257@...il.com>
To:     Marco Elver <elver@...gle.com>
Cc:     Alexander Viro <viro@...iv.linux.org.uk>,
        Alexei Starovoitov <ast@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andrey Konovalov <andreyknvl@...gle.com>,
        Andy Lutomirski <luto@...nel.org>,
        Arnd Bergmann <arnd@...db.de>, Borislav Petkov <bp@...en8.de>,
        Christoph Hellwig <hch@....de>,
        Christoph Lameter <cl@...ux.com>,
        David Rientjes <rientjes@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Eric Biggers <ebiggers@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Ilya Leoshkevich <iii@...ux.ibm.com>,
        Ingo Molnar <mingo@...hat.com>, Jens Axboe <axboe@...nel.dk>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Kees Cook <keescook@...omium.org>,
        Mark Rutland <mark.rutland@....com>,
        Matthew Wilcox <willy@...radead.org>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Pekka Enberg <penberg@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Petr Mladek <pmladek@...e.com>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Steven Rostedt <rostedt@...dmis.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Vegard Nossum <vegard.nossum@...cle.com>,
        Vlastimil Babka <vbabka@...e.cz>, kasan-dev@...glegroups.com,
        linux-mm@...ck.org, linux-arch@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 18/43] instrumented.h: add KMSAN support

arch x86, this's my revert,
https://github.com/youling257/android-mainline/commit/401cbfa61cbfc20c87a5be8e2dda68ac5702389f
i tried different revert, have to remove kmsan_copy_to_user.

2022-10-20 1:58 GMT+08:00, Marco Elver <elver@...gle.com>:
> On Wed, 19 Oct 2022 at 10:37, youling 257 <youling257@...il.com> wrote:
>>
>>
>>
>> ---------- Forwarded message ---------
>> 发件人： youling257 <youling257@...il.com>
>> Date: 2022年10月20日周四 上午1:36
>> Subject: Re: [PATCH v7 18/43] instrumented.h: add KMSAN support
>> To: <glider@...gle.com>
>> Cc: <youling257@...il.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.)
>