[RFC PATCH 0/3] Prohibit irq disable when disabled or enable when enabled

From: Nicholas Piggin
Date: Tue May 09 2023 - 07:07:55 EST


Any thoughts on tightening this up and adding some warnings for this?
Motivated by a bug I added to powerpc which broke disabled-disable

Not that I necessarily want archs to be able to depend on this, it
would always be better to be tolerant. But it seems a risky pattern
for random code to be using.

This still fires off quite a few warnings on powerpc, and I haven't
test booted any other arch so probably wouldn't ask to upstream patch
3 just yet, but if there are no objections to the idea I might do a
bit more work on it.


Nicholas Piggin (3):
hrtimer: balance irq save/restore
init: Require archs call start_kernel with arch irqs disabled
irqflags: Warn on irq disable when disabled and enable when enabled

include/linux/irqflags.h | 26 ++++++++++++++++++++++++--
init/main.c | 6 +++++-
kernel/locking/irqflag-debug.c | 14 ++++++++++++++
kernel/time/hrtimer.c | 22 +++++++++++-----------
4 files changed, 54 insertions(+), 14 deletions(-)