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PowerPC Hangs on 6.6-rc6-rt10 and Later

Message ID PH0PR22MB380974792AE8C9254DD8BA1AE53D2@PH0PR22MB3809.namprd22.prod.outlook.com
State New
Headers show
Series PowerPC Hangs on 6.6-rc6-rt10 and Later | expand

Commit Message

Robert Joslyn Dec. 11, 2024, 12:15 a.m. UTC 
I have two PowerPC platforms that I'm upgrading to a 6.6 kernel, and both hang on boot right before my initramfs. I bisected the hang to this commit: https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git/commit/?h=v6.6-rc6-rt10&id=b33022a48c797082dead4034e84f0adfbc5b1983

That commit is somewhat large, but I've narrowed it down to this part of the commit:
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Patch

diff --git a/arch/powerpc/kernel/interrupt.c b/arch/powerpc/kernel/interrupt.c
index 9f144588b33643..c4f6d3c69ba9d3 100644
--- a/arch/powerpc/kernel/interrupt.c
+++ b/arch/powerpc/kernel/interrupt.c
@@ -395,15 +395,11 @@  notrace unsigned long interrupt_exit_kernel_prepare(struct pt_regs *regs)
 		/* Returning to a kernel context with local irqs enabled. */
 		WARN_ON_ONCE(!(regs->msr & MSR_EE));
 again:
-		if (IS_ENABLED(CONFIG_PREEMPTION)) {
+		if (IS_ENABLED(CONFIG_PREEMPT)) {
...

Reverting this particular line fixes the hang. The change doesn't look quite right to me, since CONFIG_PREEMPT doesn't seem related to the other changes happening in that commit, but maybe there is something I don't see. Does this change make sense? I'm happy to send a patch reverting this particular line.

Thanks,
Robert