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.
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);
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.
Keep in mind that I may have completely messed up my analysis and I am
pursuing the wrong line entirely.
Good Luck,
Robin
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