diff options
| author | Michael Ellerman <[email protected]> | 2023-11-30 12:50:45 +0000 |
|---|---|---|
| committer | Michael Ellerman <[email protected]> | 2024-03-03 11:20:29 +0000 |
| commit | 4eb20bf34ea296f648971a8528e32cd80efcbe89 (patch) | |
| tree | ef530697adb634bd75f8e322d9ba9a325ba31b9c /drivers/usb/cdns3/cdns3-pci-wrap.c | |
| parent | powerpc: Stop using of_root (diff) | |
| download | kernel-4eb20bf34ea296f648971a8528e32cd80efcbe89.tar.gz kernel-4eb20bf34ea296f648971a8528e32cd80efcbe89.zip | |
powerpc/irq: Allow softirq to hardirq stack transition
Allow a transition from the softirq stack to the hardirq stack when
handling a hardirq. Doing so means a hardirq received while deep in
softirq processing is less likely to cause a stack overflow of the
softirq stack.
Previously it wasn't safe to do so because irq_exit() (which initiates
softirq processing) was called on the hardirq stack.
That was changed in commit 1b1b6a6f4cc0 ("powerpc: handle irq_enter/
irq_exit in interrupt handler wrappers") and 1346d00e1bdf ("powerpc:
Don't select HAVE_IRQ_EXIT_ON_IRQ_STACK").
The allowed transitions are now:
- process stack -> hardirq stack
- process stack -> softirq stack
- process stack -> softirq stack -> hardirq stack
Reviewed-by: Christophe Leroy <[email protected]>
Signed-off-by: Michael Ellerman <[email protected]>
Link: https://msgid.link/[email protected]
Diffstat (limited to 'drivers/usb/cdns3/cdns3-pci-wrap.c')
0 files changed, 0 insertions, 0 deletions