linux-kernel - Re: [PATCH 2.6.25.10 1/2] libata: fix locking for kmap

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Date:	Sun, 13 Jul 2008 15:30:02 +0200
From:	"Jakub W. Jozwicki" <jozwicki@...er.pl>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	linux-kernel@...r.kernel.org, jgarzik@...hat.com, mingo@...e.hu,
	tglx@...esys.com
Subject: Re: [PATCH 2.6.25.10 1/2] libata: fix locking for kmap_atomic

Sunday, 13 of July 2008 12:25:43 Alan Cox napisał(a):
> On Sun, 13 Jul 2008 01:27:36 +0200
>
> "Jakub W. Jozwicki" <jozwicki@...er.pl> wrote:
> > Change locking surrounding kmap_atomic from local_irqsave to
> > local_irqsave_nort. This fixes issues with PREEMPT_RT.
> >
> > Signed-off-by:  Jakub Jozwicki <jozwicki@...er.pl>
>
> The right way to fix this is to use a bounce buffer. I sent Jeff patches
> to do that a couple of times. I'm not sure what has happened to them
> since ? So NAK this, we should apply the patch to actually fix the bug
> instead.
>
> Jeff ?
>
> Alan

Sent patch was for:

[   16.787021] BUG: sleeping function called from invalid context IRQ-14(5730) 
at arch/x86/mm/highmem_32.c:8
[   16.787021] in_atomic():0 [00000000], irqs_disabled():1
[   16.787021] Pid: 5730, comm: IRQ-14 Not tainted 2.6.25.10-rtXXX #12
[   16.787021]  [<c0120fc4>] __might_sleep+0xf1/0xf8
[   16.787021]  [<c011c035>] kmap+0x47/0x5a
[   16.787021]  [<c03442b2>] ata_scsi_rbuf_get+0x23/0x31
[   16.787021]  [<c0345975>] atapi_qc_complete+0x252/0x2c5
[   16.787021]  [<c012edee>] ? irq_exit+0x7b/0x7e
[   16.787021]  [<c0109727>] ? do_IRQ+0x6e/0x87
[   16.787021]  [<c033d041>] __ata_qc_complete+0x8e/0x93
[   16.787021]  [<c033ddfb>] ata_qc_complete+0x182/0x188
[   16.787021]  [<c033e188>] ata_hsm_qc_complete+0xa1/0xa5
[   16.787021]  [<c033e8fd>] ata_hsm_move+0x5dd/0x628
[   16.787021]  [<c0342f76>] ata_interrupt+0x14e/0x1cb
[   16.787021]  [<c015c72c>] handle_IRQ_event+0x4e/0xd1
[   16.787021]  [<c015d266>] do_irqd+0x126/0x224
[   16.787021]  [<c015d140>] ? do_irqd+0x0/0x224
[   16.787021]  [<c013ae9d>] kthread+0x3b/0x62
[   16.787021]  [<c013ae62>] ? kthread+0x0/0x62
[   16.787021]  [<c0108287>] kernel_thread_helper+0x7/0x10
[   16.787021]  =======================

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