Re: [PATCH RFC v3 18/36] kmsan: disable LOCK_DEBUGGING_SUPPORT

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To: Alexander Potapenko <glider@xxxxxxxxxx>
Subject: Re: [PATCH RFC v3 18/36] kmsan: disable LOCK_DEBUGGING_SUPPORT
From: Qian Cai <cai@xxxxxx>
Date: Tue, 3 Dec 2019 10:00:26 -0500
Cc: Marco Elver <elver@xxxxxxxxxx>, Eric Biggers <ebiggers@xxxxxxxxxx>, Christoph Hellwig <hch@xxxxxx>, Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>, Harry Wentland <harry.wentland@xxxxxxx>, Vegard Nossum <vegard.nossum@xxxxxxxxxx>, Dmitry Vyukov <dvyukov@xxxxxxxxxx>, Linux Memory Management List <linux-mm@xxxxxxxxx>, Al Viro <viro@xxxxxxxxxxxxxxxxxx>, Andreas Dilger <adilger.kernel@xxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Andrey Konovalov <andreyknvl@xxxxxxxxxx>, Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxx>, Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>, Arnd Bergmann <arnd@xxxxxxxx>, Christoph Hellwig <hch@xxxxxxxxxxxxx>, "Darrick J. Wong" <darrick.wong@xxxxxxxxxx>, "David S. Miller" <davem@xxxxxxxxxxxxx>, Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>, Eric Dumazet <edumazet@xxxxxxxxxx>, Eric Van Hensbergen <ericvh@xxxxxxxxx>, Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>, Ilya Leoshkevich <iii@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxx>, Jason Wang <jasowang@xxxxxxxxxx>, Jens Axboe <axboe@xxxxxxxxx>, Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>, Mark Rutland <Mark.Rutland@xxxxxxx>, "Martin K. Petersen" <martin.petersen@xxxxxxxxxx>, Martin Schwidefsky <schwidefsky@xxxxxxxxxx>, Matthew Wilcox <willy@xxxxxxxxxxxxx>, "Michael S. Tsirkin" <mst@xxxxxxxxxx>, Michal Simek <monstr@xxxxxxxxx>, Petr Mladek <pmladek@xxxxxxxx>, Randy Dunlap <rdunlap@xxxxxxxxxxxxx>, Robin Murphy <Robin.Murphy@xxxxxxx>, Sergey Senozhatsky <sergey.senozhatsky@xxxxxxxxx>, Steven Rostedt <rostedt@xxxxxxxxxxx>, Takashi Iwai <tiwai@xxxxxxxx>, "Theodore Ts'o" <tytso@xxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Vasily Gorbik <gor@xxxxxxxxxxxxx>, Wolfram Sang <wsa@xxxxxxxxxxxxx>
In-reply-to: <CAG_fn=XmFDy7R2=fZFUTBGmb-h1JGM-J3RDedBMabTw+Acry9Q@mail.gmail.com>
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> On Dec 3, 2019, at 9:35 AM, Alexander Potapenko <glider@xxxxxxxxxx> wrote:
> 
> At this point I don't really know why KMSAN and lockdep don't play
> well together, but I'm not expecting anyone to use them together
> either.

Of course people will use those together. For example, distro debug kernel variants.

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  - From: Alexander Potapenko

References:
- Re: [PATCH RFC v3 18/36] kmsan: disable LOCK_DEBUGGING_SUPPORT
  - From: Alexander Potapenko

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