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authorChuck Ebbert <cebbert@redhat.com>2007-08-10 22:31:11 +0200
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-08-11 15:58:14 -0700
commit3dab307e527f2a9bbb4f9d00240374bb93d1945f (patch)
tree3e9a83d6cc1cee1dcfedff700c0b4aeebaa2f8d5 /arch/mips/Kconfig
parent5fe4486c79cdc8dbbb2a9c3f884a5ad0830a5a23 (diff)
downloadop-kernel-dev-3dab307e527f2a9bbb4f9d00240374bb93d1945f.zip
op-kernel-dev-3dab307e527f2a9bbb4f9d00240374bb93d1945f.tar.gz
i386: Fix double fault handler
The new percpu code has apparently broken the doublefault handler when CONFIG_DEBUG_SPINLOCK is set. Doublefault is handled by a hardware task, making the check SPIN_BUG_ON(lock->owner == current, lock, "recursion"); fault because it uses the FS register to access the percpu data for current, and that register is zero in the new TSS. (The trace I saw was on 2.6.20 where it was GS, but it looks like this will still happen with FS on 2.6.22.) Initializing FS in the doublefault_tss should fix it. AK: Also fix broken ptr_ok() and turn printks into KERN_EMERG AK: And add a PANIC prefix to make clear the system will hang AK: (e.g. x86-64 will recover) Signed-off-by: Chuck Ebbert <cebbert@redhat.com> Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/mips/Kconfig')
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