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

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Date:	Sun, 13 Jul 2008 10:46:29 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	"Jakub W. Jozwicki" <jozwicki@...er.pl>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, mingo@...e.hu, tglx@...esys.com
Subject: Re: [PATCH 2.6.25.10 1/2] libata: fix locking for kmap_atomic

Jakub W. Jozwicki wrote:
>
> Sorry, this was for -rt only.
>
> [   17.012011] BUG: sleeping function called from invalid context IRQ-14(5732) 
> at arch/x86/mm/highmem_32.c:8
> [   17.012011] in_atomic():0 [00000000], irqs_disabled():1
> [   17.012011] Pid: 5732, comm: IRQ-14 Not tainted 2.6.25.10-rtXXX #11
> [   17.012011]  [<c0120fc4>] __might_sleep+0xf1/0xf8
> [   17.012011]  [<c011c035>] kmap+0x47/0x5a
>   

The subject says kmap_atomic, but this is kmap.  It definitely makes no 
sense to call kmap in an IRQ, regardless of the locking.  There seems to 
be a larger structural problem here.

> [   17.012011]  [<c033e728>] ata_hsm_move+0x3d7/0x657
> [   17.012011]  [<c0342fd6>] ata_interrupt+0x14e/0x1cb
> [   17.012011]  [<c015c72c>] handle_IRQ_event+0x4e/0xd1
> [   17.012011]  [<c015d266>] do_irqd+0x126/0x224
> [   17.012011]  [<c015d140>] ? do_irqd+0x0/0x224
> [   17.012011]  [<c013ae9d>] kthread+0x3b/0x62
> [   17.012011]  [<c013ae62>] ? kthread+0x0/0x62
> [   17.012011]  [<c0108287>] kernel_thread_helper+0x7/0x10
> [   17.012011]  =======================
>   

    J
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