I bisected today. 1. git clone https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git -b powerpc-6.19-1 a
2. cd a 3. git log Output: commit 9b36c7fc5aa5f2c6e6eeb9f312fdfe61b4291c9f (HEAD, tag: powerpc-6.19-1, origin/next-test, origin/next) ... 4. git bisect start 5. git bisect good f850568efe3a7a9ec4df357cfad1f997f0058924 Merge tag 'i2c-for-6.18-rc5' 6. git bisect bad 9b36c7fc5aa5f2c6e6eeb9f312fdfe61b4291c9f macintosh/via-pmu-backlight: Include <linux/fb.h> and <linux/of.h> 7. git bisect bad 8. git bisect bad 9. git bisect good 10. git bisect bad 11. git bisect good 2997876c4a1a5864baa13d7393c2b68cf5b51183 is the first bad commit commit 2997876c4a1a5864baa13d7393c2b68cf5b51183 Author: Christophe Leroy <[email protected]> Date: Thu Sep 11 14:30:12 2025 +0200 powerpc/32: Restore clearing of MSR[RI] at interrupt/syscall exit Commit 13799748b957 ("powerpc/64: use interrupt restart table to speed up return from interrupt") removed the inconditional clearing of MSR[RI] when returning from interrupt into kernel. But powerpc/32 doesn't implement interrupt restart table hence still need MSR[RI] to be cleared. It could be added back in interrupt_exit_kernel_prepare() but it is easier and better to add it back in entry_32.S for following reasons: - Writing to MSR must be followed by a synchronising instruction - The smaller the non recoverable section is the better it is So add a macro called clr_ri and use it in the three places that play up with SRR0/SRR1. Use it just before another mtspr for synchronisation to avoid having to add an isync. Now that's done in entry_32.S, exit_must_hard_disable() can return false for non book3s/64, taking into account that BOOKE doesn't have MSR_RI. Also add back blacklisting syscall_exit_finish for kprobe. This was initially added by commit 7cdf44013885 ("powerpc/entry32: Blacklist syscall exit points for kprobe.") then lost with commit 6f76a01173cc ("powerpc/syscall: implement system call entry/exit logic in C for PPC32"). Fixes: 6f76a01173cc ("powerpc/syscall: implement system call entry/exit logic in C for PPC32") Fixes: 13799748b957 ("powerpc/64: use interrupt restart table to speed up return from interrupt") Signed-off-by: Christophe Leroy <[email protected]> Signed-off-by: Madhavan Srinivasan <[email protected]> Link: https://patch.msgid.link/66d0ab070563ad460ed481328ab0887c27f21a2c.1757593807.git.christophe.le...@csgroup.eu arch/powerpc/kernel/entry_32.S | 18 +++++++++++++++++- arch/powerpc/kernel/interrupt.c | 2 +- 2 files changed, 18 insertions(+), 2 deletions(-) 12. git revert 2997876c4a1a5864baa13d7393c2b68cf5b51183 After reverting the first bad commit, the kernel boots without any problems.
