Re: [PATCH] block: fix q->max_segment_size checking in blk_recalc_rq_segments about VMERGE | KernelTrap

Re: [PATCH] block: fix q->max_segment_size checking in blk_recalc_rq_segments about VMERGE

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From: David Miller <davem@...>

To: <James.Bottomley@...>

Cc: <mpatocka@...>, <fujita.tomonori@...>, <jens.axboe@...>, <linux-kernel@...>, <linux-scsi@...>, <linux-parisc@...>

Subject: Re: [PATCH] block: fix q->max_segment_size checking in blk_recalc_rq_segments about VMERGE

Date: Friday, July 25, 2008 - 1:21 am

From: James Bottomley <James.Bottomley@HansenPartnership.com>
Date: Thu, 24 Jul 2008 23:47:50 -0400

quoted text> I'm sorry sparc broke, really I am ... but you changed your iommu code
> from one with a working vmerge to one without and failed to turn off
> vmerging.  Partly it wasn't noticed because at 2*PAGE_SIZE you have a
> strange vmerge boundary, so it's harder to notice.   However, I can't
> extrapolate that just because this happened on sparc it will inevitably
> happen on all other architectures.

The vmerge boundary on sparc64 was 8K which is equal to sparc64's base
PAGE_SIZE.  I don't know where you get that 2*PAGE_SIZE from.

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Messages in current thread:

[PATCH] block: fix q->max_segment_size checking in blk_re..., FUJITA Tomonori, (Tue Jul 15, 6:44 am)

Re: [PATCH] block: fix q->max_segment_size checking in bl..., Mikulas Patocka, (Tue Jul 15, 9:37 am)

Re: [PATCH] block: fix q->max_segment_size checking in bl..., FUJITA Tomonori, (Tue Jul 15, 10:20 am)

Re: [PATCH] block: fix q->max_segment_size checking in bl..., James Bottomley, (Tue Jul 15, 10:50 am)

Re: [PATCH] block: fix q->max_segment_size checking in bl..., Mikulas Patocka, (Tue Jul 15, 11:24 am)

Re: [PATCH] block: fix q->max_segment_size checking in bl..., James Bottomley, (Tue Jul 15, 11:41 am)

Re: [PATCH] block: fix q->max_segment_size checking in bl..., Mikulas Patocka, (Tue Jul 15, 11:58 am)

Re: [PATCH] block: fix q->max_segment_size checking in bl..., James Bottomley, (Tue Jul 15, 12:07 pm)

Re: [PATCH] block: fix q->max_segment_size checking in bl..., Mikulas Patocka, (Tue Jul 15, 12:20 pm)

Re: [PATCH] block: fix q->max_segment_size checking in bl..., James Bottomley, (Tue Jul 15, 12:36 pm)

Re: [PATCH] block: fix q->max_segment_size checking in bl..., Mikulas Patocka, (Tue Jul 15, 5:50 pm)

Re: [PATCH] block: fix q->max_segment_size checking in bl..., Mikulas Patocka, (Tue Jul 15, 10:37 am)

Re: [PATCH] block: fix q->max_segment_size checking in bl..., FUJITA Tomonori, (Tue Jul 15, 11:30 am)

Re: [PATCH] block: fix q->max_segment_size checking in bl..., Mikulas Patocka, (Tue Jul 15, 11:46 am)

Re: [PATCH] block: fix q->max_segment_size checking in bl..., FUJITA Tomonori, (Tue Jul 15, 8:34 pm)

Re: [PATCH] block: fix q->max_segment_size checking in bl..., Mikulas Patocka, (Wed Jul 16, 2:02 pm)

Re: [PATCH] block: fix q->max_segment_size checking in bl..., FUJITA Tomonori, (Thu Jul 17, 12:14 am)

Re: [PATCH] block: fix q->max_segment_size checking in bl..., Mikulas Patocka, (Thu Jul 17, 7:50 am)

Re: [PATCH] block: fix q->max_segment_size checking in bl..., FUJITA Tomonori, (Thu Jul 17, 9:18 am)

Re: [PATCH] block: fix q->max_segment_size checking in bl..., David Miller, (Sat Jul 19, 3:28 am)

Re: [PATCH] block: fix q->max_segment_size checking in bl..., Mikulas Patocka, (Sat Jul 19, 9:45 pm)

Re: [PATCH] block: fix q->max_segment_size checking in bl..., David Miller, (Sun Jul 20, 1:54 am)

Re: [PATCH] block: fix q->max_segment_size checking in bl..., James Bottomley, (Sat Jul 19, 10:17 pm)

Re: [PATCH] block: fix q->max_segment_size checking in bl..., David Miller, (Sun Jul 20, 12:07 am)

Re: [PATCH] block: fix q->max_segment_size checking in bl..., James Bottomley, (Sun Jul 20, 10:52 am)

Re: [PATCH] block: fix q->max_segment_size checking in bl..., David Miller, (Sun Jul 20, 1:23 pm)

Re: [PATCH] block: fix q->max_segment_size checking in bl..., James Bottomley, (Sun Jul 20, 1:33 pm)

Re: [PATCH] block: fix q->max_segment_size checking in bl..., Mikulas Patocka, (Thu Jul 24, 11:07 am)

Re: [PATCH] block: fix q->max_segment_size checking in bl..., James Bottomley, (Thu Jul 24, 11:28 am)

Re: [PATCH] block: fix q->max_segment_size checking in bl..., Mikulas Patocka, (Thu Jul 24, 12:34 pm)

Re: [PATCH] block: fix q->max_segment_size checking in bl..., James Bottomley, (Thu Jul 24, 12:52 pm)

Re: [PATCH] block: fix q->max_segment_size checking in bl..., Mikulas Patocka, (Thu Jul 24, 5:49 pm)

Re: [PATCH] block: fix q->max_segment_size checking in bl..., John David Anglin, (Thu Jul 24, 10:40 pm)

Re: [PATCH] block: fix q->max_segment_size checking in bl..., FUJITA Tomonori, (Thu Jul 24, 10:26 pm)

Re: [PATCH] block: fix q->max_segment_size checking in bl..., David Miller, (Thu Jul 24, 5:53 pm)

Re: [PATCH] block: fix q->max_segment_size checking in bl..., James Bottomley, (Thu Jul 24, 11:47 pm)

Re: [PATCH] block: fix q->max_segment_size checking in bl..., David Miller, (Fri Jul 25, 1:21 am)

Re: [PATCH] block: fix q->max_segment_size checking in bl..., Boaz Harrosh, (Thu Jul 17, 9:27 am)

Re: [PATCH] block: fix q->max_segment_size checking in bl..., James Bottomley, (Thu Jul 17, 9:56 am)

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