lkml.org 
[lkml]   [2003]   [Nov]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: BUG: Kernel Panic: kernel-2.6.0-test9-bk21 for alpha in scsi context ll_rw_blk.c
On http://steudten.com/alpha/perf.php4 you can read:
See prefetch section:
The Alpha 21264 initiates a prefetch operation by executing one of the load
instructions as summarized in the table below. Note that the destination
register is R31 or F31. When used as a source register, R31 and F31 return
integer zero and floating point zero, respectively. When used as a
destination register as shown below, R31 and F31 denote the purpose of
these instructions as a prefetch operation. Earlier Alpha implementations
ignore these instructions. Some care must be taken as a prefetch with an
invalid address must be dismissed by firmware and a prefetch can cause an
alignment trap.

Tom


Falk Hueffner wrote:

> Thomas Steudten <alpha@steudten.com> writes:
>
>
>>-> 0xfffffc0000476cb8 <__make_request+152>: lds $f31,0(t2)
>
>
> The kernel is stupid, this is a prefetch, it should be totally ignored
> if it is faulty. This is already handled for userspace accesses
> IIRC... (I wonder why the PALcode doesn't already do that. Oh well.)
>

--
Tom

LINUX user since kernel 0.99.x 1994.
RPM Alpha packages at http://alpha.steudten.com/packages
Want to know what S.u.S.E 1995 cdrom-set contains?


-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:58    [from the cache]
©2003-2011 Jasper Spaans