Andi Kleen <[EMAIL PROTECTED]> writes: > From: Benjamin Romer <[EMAIL PROTECTED]> > > On the Unisys ES7000/ONE system, we encountered a problem where performing > a kexec reboot or dump on any cell other than cell 0 causes the system > timer to stop working, resulting in a hang during timer calibration in the > new kernel. > > We traced the problem to one line of code in disable_IO_APIC(), which needs > to restore the timer's IO-APIC configuration before rebooting. The code is > currently using the 4-bit physical destination field, rather than using the > 8-bit logical destination field, and it cuts off the upper 4 bits of the > timer's APIC ID. If we change this to use the logical destination field, > the timer works and we can kexec on the upper cells. This was tested on > two different cells (0 and 2) in an ES7000/ONE system. > > For reference, the relevant Intel xAPIC spec is kept at > ftp://download.intel.com/design/chipsets/e8501/datashts/30962001.pdf, > specifically on page 334. > > Signed-off-by: Benjamin M Romer <[EMAIL PROTECTED]> > Signed-off-by: Andi Kleen <[EMAIL PROTECTED]> > Cc: Andi Kleen <[EMAIL PROTECTED]> > Cc: "Eric W. Biederman" <[EMAIL PROTECTED]> > Cc: Vivek Goyal <[EMAIL PROTECTED]> > Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Acked-by: Eric W. Biederman" <[EMAIL PROTECTED]> - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
