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Message-ID: <20211024153041.GF4721@alpha.franken.de> Date: Sun, 24 Oct 2021 17:30:41 +0200 From: Thomas Bogendoerfer <tsbogend@...ha.franken.de> To: Mark Rutland <mark.rutland@....com> Cc: linux-kernel@...r.kernel.org, aou@...s.berkeley.edu, catalin.marinas@....com, deanbo422@...il.com, green.hu@...il.com, guoren@...nel.org, jonas@...thpole.se, kernelfans@...il.com, linux-arm-kernel@...ts.infradead.org, linux@...linux.org.uk, maz@...nel.org, nickhu@...estech.com, palmer@...belt.com, paulmck@...nel.org, paul.walmsley@...ive.com, peterz@...radead.org, shorne@...il.com, stefan.kristiansson@...nalahti.fi, tglx@...utronix.de, torvalds@...ux-foundation.org, vgupta@...nel.org, will@...nel.org Subject: Re: [PATCH 02/15] irq: mips: stop (ab)using handle_domain_irq() On Thu, Oct 21, 2021 at 07:02:23PM +0100, Mark Rutland wrote: > On MIPS, the only user of handle_domain_irq() is octeon_irq_ciu3_ip2(), > which is called from the platform-specific plat_irq_dispatch() function > invoked from the early assembly code. > > No other irqchip relevant to arch/mips uses handle_domain_irq(): > > * No other plat_irq_dispatch() function transitively calls > handle_domain_irq(). > > * No other vectored IRQ dispatch function registered with > set_vi_handler() calls handle_domain_irq(). > > * No chained irqchip handlers call handle_domain_irq(), which makes > sense as this is meant to only be used by root irqchip handlers. > > Currently octeon_irq_ciu3_ip2() passes NULL as the `regs` argument to > handle_domain_irq(), and as handle_domain_irq() will pass this to > set_irq_regs(), any invoked IRQ handlers will erroneously see a NULL > pt_regs if they call get_pt_regs(). > > Fix this by calling generic_handle_domain_irq() directly, and performing > the necessary irq_{enter,exit}() logic directly in > octeon_irq_ciu3_ip2(). At the same time, deselect HANDLE_DOMAIN_IRQ, > which subsequent patches will remove. > > Other than the corrected behaviour of get_pt_regs(), there should be no > functional change as a result of this patch. > > Fixes: ce210d35bb93c2c5 ("MIPS: OCTEON: Add support for OCTEON III interrupt controller.") > Signed-off-by: Mark Rutland <mark.rutland@....com> > Cc: Marc Zyngier <maz@...nel.org> > Cc: Thomas Bogendoerfer <tsbogend@...ha.franken.de> > Cc: Thomas Gleixner <tglx@...utronix.de> > --- > arch/mips/Kconfig | 1 - > arch/mips/cavium-octeon/octeon-irq.c | 5 ++++- > 2 files changed, 4 insertions(+), 2 deletions(-) Acked-by: Thomas Bogendoerfer <tsbogend@...ha.franken.de> -- Crap can work. Given enough thrust pigs will fly, but it's not necessarily a good idea. [ RFC1925, 2.3 ]
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