Bug#622997: Debian bug 622997
> On Sat, 2011-04-16 at 19:35 -0400, John David Anglin wrote:
> > On Sat, 16 Apr 2011, James Bottomley wrote:
> >
> > > Strike that one ... I enabled USB in my 2.6.39-rc3 build and it inserts
> > > the OHCI module and discovers the ports just fine.
> >
> > Boot 2.6.39-rc3 fails for me with attached config.
>
> I can't quite build it. With gcc version 4.2.4 (Debian 4.2.4-6) I'm
> getting an ICE:
>
> net/wireless/reg.c: In function 'freq_reg_info_regd':
> net/wireless/reg.c:645: internal compiler error: in expand_expr_real_1,
> at expr.c:8744
> Please submit a full bug report,
> with preprocessed source if appropriate.
> See <URL:http://gcc.gnu.org/bugs.html> for instructions.
> For Debian GNU/Linux specific bug reporting instructions,
> see <URL:file:///usr/share/doc/gcc-4.2/README.Bugs>.
> make[2]: *** [net/wireless/reg.o] Error 1
This is probably fixed as it doesn't occur with
gcc version 4.5.3 20110101 (prerelease) [gcc-4_5-branch revision 168387] (GCC) .
GCC 4.2 and 4.3 are no longer maintained and there won't be any further
releases from these branches.
Without looking at the above, it's hard to tell whether the bug is a
middle-end or backend bug. Many middle-end bugs are fixed in more recent
GCC versions. Although newer versions may bring their own problems,
we can get help in fixing problems particularly if they are regressions.
The asm delay slot bug affected all GCC versions. I backported the fix to
the 4.3, 4.4 and 4.5 branches. This is a problem in the kernel because of
the following:
** The __asm__ op below simple prevents gcc/ld from reordering
** instructions across the mb() "call".
*/
#define mb() __asm__ __volatile__("":::"memory") /* barrier() */
It's just a matter of chance whether a barrier ends up in the delay slot
of a branch in a critical location.
> Plus there's a bug in my kernel code:
>
> drivers/usb/host/xhci-pci.c: In function 'xhci_pci_setup':
> drivers/usb/host/xhci-pci.c:61: error: implicit declaration of function
> 'kzalloc
>
> If I correct for these (add missing slab.h include and disable wireless)
I had to add missing slab.h as well. However, I didn't touch wireless
with 4.5.3.
> and build, the last message I see is
>
> turn off boot console ttyB0
>
> Which indicates it's got a problem with the console configuration (I
> don't see any console registration for the DIVA serial port on ttyS1 in
> the boot log).
Comparing the console output that I recorded for the debian kernel, I
see udev starts much earlier. It only has the initial message from the
tg3 driver and SCSI subsystem.
Dave
--
J. David Anglin dave.anglin@nrc-cnrc.gc.ca
National Research Council of Canada (613) 990-0752 (FAX: 952-6602)
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