linux/arch/powerpc
Mike Wolf a71f5d5d27 powerpc/ptrace: Remove BUG_ON when full register set not available
In some cases during a threaded core dump not all the threads will have
a full register set. This happens when the signal causing the core dump
races with a thread exiting.  The race happens when the exiting thread
has entered the kernel for the last time before the signal arrives, but
doesn't get far enough through the exit code to avoid being included
in the core dump.

So we get a thread included in the core dump which is never going to go
out to userspace again and only has a partial register set recorded

Normally we would catch each thread as it is about to go into userspace
and capture the full register set then.

However, this exiting thread is never going to go out to userspace
again, so we have no way to capture its full register set.  It doesn't
really matter, though, as this is a thread which is effectively
already dead.

So instead of hitting a BUG() in this case (a really bad choice of
action in the first place), we use a poison value for the register
values.

[BenH]: Some cosmetic/stylistic changes and fix build on ppc32

Signed-off-by: Mike Wolf <mjw@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2011-03-21 11:18:14 +11:00
..
boot Merge remote branch 'jwb/next' into next 2011-03-17 17:59:01 +11:00
configs powerpc/8xx: remove obsolete mgsuvd board 2011-03-15 10:11:27 -05:00
include/asm powerpc/ptrace: Remove BUG_ON when full register set not available 2011-03-21 11:18:14 +11:00
kernel powerpc/ptrace: Remove BUG_ON when full register set not available 2011-03-21 11:18:14 +11:00
kvm KVM: PPC: Fix SPRG get/set for Book3S and BookE 2011-03-17 13:08:25 -03:00
lib powerpc: Ensure the else case of feature sections will fit 2011-01-21 14:08:33 +11:00
math-emu powerpc/85xx: Fix SPE float to integer conversion failure 2011-03-15 13:48:15 -05:00
mm Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc 2011-03-18 06:31:43 -07:00
oprofile tree-wide: fix comment/printk typos 2010-11-01 15:38:34 -04:00
platforms Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc 2011-03-18 06:31:43 -07:00
sysdev powerpc: Factoring mpic cpu id fetching into a function 2011-03-21 11:01:32 +11:00
xmon powerpc/Makefiles: Change to new flag variables 2010-10-13 16:19:22 +11:00
Kconfig powerpc: Enable GENERIC_HARDIRQS_NO_DEPRECATED. 2011-03-10 11:04:04 +11:00
Kconfig.debug powerpc: Unconditionally enabled irq stacks 2010-06-15 15:02:37 +10:00
Makefile powerpc: Fix typo in uImage target 2010-08-24 15:26:32 +10:00
relocs_check.pl