On 20.08.2008 [09:35:31 -0500], Robin Holt wrote:
> On Tue, Aug 19, 2008 at 03:56:06PM -0700, Nishanth Aravamudan wrote:
> > Hi Tony, Bart,
> >
> > As mentioned in the cpu_clock() thread, I am seeing (consistently) 5
> > unaligned accesses in the bootlogs on a 2-node IA64 box:
> >
> > [ 32.593534] kernel unaligned access to 0xe000000644220466, ip=0xa000000100516fa1
> > [ 32.601171] kernel unaligned access to 0xe00000064422046e, ip=0xa000000100516fa1
> > [ 35.333273] kernel unaligned access to 0xe00000064451693e, ip=0xa000000100516fa1
> > [ 35.340912] kernel unaligned access to 0xe000000644516942, ip=0xa000000100516fa1
> > [ 35.348557] kernel unaligned access to 0xe000000644516946, ip=0xa000000100516fa1
> >
> > Looking in the corresponding System.map, I see:
> >
> > a000000100516940 T ide_input_data
> > a000000100516ec0 T ide_output_data
> > a000000100517340 T ide_execute_command
> > a000000100517420 t atapi_reset_pollfunc
>
> I compiled your .config with commit ??? and got ide_output_data at
> a000000100516ae0 so the offending instruction is at a000000100516bc1
>
> a000000100516bc0: 08 a8 00 4c 18 10 [MMI] ld8 r21=[r38]
> a000000100516bc6: d0 22 90 20 28 c0 ld4 r45=[r36],4
> a000000100516bcc: 05 28 01 84 mov r46=r37
>
> Those look reasonable.
See my reply to Peter, but this seems the same as my results.
> That seems to be coming from include/asm/io.h:280
>
> static inline void
> __outsl (unsigned long port, const void *src, unsigned long count)
> {
> const unsigned int *sp = src;
>
> while (count--)
> platform_outl(*sp++, port);
> }
>
> which is really outsl and that is only used on line 339:
> outsl(data_addr, buf, len / 4);
As does this.
> With as little as I know about what I am doing, I would probably add a
> printk immediately after the outsl line and dump out data_addr, buf,
> and len to see what those values are. I expect either data_addr is
> not aligned on an 8 byte boundary or buf is not aligned on a 4 byte
> boundary.
Here's what I got, I put the printk() before the outsl() line, as I
don't believe the arguments are being manipulated?
[ 32.597792] outsl(496, e000000644678466, 3)
[ 32.602116] kernel unaligned access to 0xe000000644678466, ip=0xa0000001005174d1
[ 32.609744] kernel unaligned access to 0xe00000064467846e, ip=0xa0000001005174d1
[ 35.342053] outsl(496, e0000013041d693e, 3)
[ 35.346388] kernel unaligned access to 0xe0000013041d693e, ip=0xa0000001005174d1
[ 35.354016] kernel unaligned access to 0xe0000013041d6942, ip=0xa000000100517531
[ 35.361633] kernel unaligned access to 0xe0000013041d6946, ip=0xa0000001005174d1
[ 32.648053] outsl(496, e000000644678466, 3)
[ 35.377343] outsl(496, e0000013041d693e, 3)
[ 35.383999] outsl(496, e000001303fbd9c6, 3)
[ 35.398650] outsl(496, e0000013041d693e, 3)
[ 35.405287] outsl(496, e000001303fbd9c6, 3)
[ 35.410586] outsl(496, e0000013041d693e, 3)
[ 35.417489] outsl(496, e000001303fbd9c6, 3)
[ 35.444091] outsl(496, e000001303fbd2a6, 3)
[ 35.449121] outsl(496, e0000013041d693e, 3)
[ 35.455748] outsl(496, e000001303fbd2a6, 3)
[ 35.470427] outsl(496, e0000013041d693e, 3)
[ 35.477141] outsl(496, e000001303fbd2a6, 3)
[ 35.482305] outsl(496, e0000013041d693e, 3)
[ 35.488964] outsl(496, e000001303fbd2a6, 3)
[ 35.494232] outsl(496, e0000013041d693e, 3)
[ 35.500912] outsl(496, e000001303fbd2a6, 3)
Thanks,
Nish
--
Nishanth Aravamudan <nacc@xxxxxxxxxx>
IBM Linux Technology Center
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