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From: Roland Dreier <roland@topspin.com>
To: "Michael S. Tsirkin" <mst@mellanox.co.il>
Cc: linux-kernel mailing list <linux-kernel@vger.kernel.org>
Subject: Re: f_ops flag to speed up compatible ioctls in linux kernel
Date: Wed, 01 Sep 2004 14:44:01 -0700	[thread overview]
Message-ID: <52656xzmu6.fsf@topspin.com> (raw)
In-Reply-To: <20040901212314.GA26044@mellanox.co.il> (Michael S. Tsirkin's message of "Thu, 2 Sep 2004 00:23:15 +0300")

    Michael> Now that I look at the ioctl.c code, I see a several
    Michael> get_user/put_user inside the ioctl which are thus done
    Michael> while BKL is held.  But I thought get_user can block?

    Michael> Why is this not a bug?

It's fine to sleep while holding the BKL (it will be dropped and then
reacquired when the process wakes up).

 - Roland


  parent reply	other threads:[~2004-09-01 21:49 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2004-09-01 15:40 f_ops flag to speed up compatible ioctls in linux kernel Albert Cahalan
2004-09-01 21:23 ` Michael S. Tsirkin
2004-09-01 21:38   ` Lee Revell
2004-09-01 21:43   ` Chris Wright
2004-09-01 21:44   ` Roland Dreier [this message]
  -- strict thread matches above, loose matches on Subject: below --
2004-12-27 22:22 Michael S. Tsirkin
2004-09-01 15:36 Albert Cahalan
2004-09-01 15:59 ` Roland Dreier
2004-09-01 21:53   ` Michael S. Tsirkin
2004-09-01 22:58     ` Roland Dreier
2004-09-01 23:18       ` Michael S. Tsirkin
2004-09-01  9:50 filia
2004-09-01  9:52 ` Arjan van de Ven
2004-09-01 10:16   ` filia
     [not found]     ` <4135B9FC.7050602@hist.no>
2004-09-01 13:29       ` Ihar 'Philips' Filipau
2004-09-01 15:28         ` Ihar 'Philips' Filipau
2004-09-02  7:29         ` Helge Hafting
2004-09-01 13:43     ` Olivier Galibert
2004-09-01  7:22 Michael S. Tsirkin
2004-09-01  7:32 ` viro
2004-09-01  7:44   ` Michael S. Tsirkin
2004-09-01  7:47   ` Lee Revell
2004-09-01  8:19     ` Michael S. Tsirkin
2004-09-01 15:55   ` Roland Dreier
2004-09-01 18:02     ` Chris Wright
2004-09-01 18:12       ` Roland Dreier
2004-09-01 18:31         ` viro
2004-09-01 20:54       ` Roland Dreier
     [not found]         ` <20040901170800.K1924@build.pdx.osdl.net>
     [not found]           ` <20040901190122.L1924@build.pdx.osdl.net>
2004-09-02  3:46             ` Roland Dreier
2004-09-01 18:06   ` Bill Davidsen
2004-09-01  8:30 ` Arjan van de Ven

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