lkml.org 
[lkml]   [2021]   [Sep]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCHv2 5/5] irqchip/GICv3: make reschedule-ipi light weight
On Fri, 24 Sep 2021 14:28:37 +0100,
Pingfan Liu <kernelfans@gmail.com> wrote:
>
> To achieve the light weight as
> DEFINE_IDTENTRY_SYSVEC_SIMPLE(sysvec_reschedule_ipi) on x86, it had
> better treat irqnr differently at the frontend. And let IPI_RESCHEDULE
> call __irq_enter_raw() instead of irq_enter_rcu().
>
> Signed-off-by: Pingfan Liu <kernelfans@gmail.com>
> Cc: Catalin Marinas <catalin.marinas@arm.com>
> Cc: Will Deacon <will@kernel.org>
> Cc: Mark Rutland <mark.rutland@arm.com>
> Cc: Marc Zyngier <maz@kernel.org>
> Cc: Joey Gouly <joey.gouly@arm.com>
> Cc: Sami Tolvanen <samitolvanen@google.com>
> Cc: Julien Thierry <julien.thierry@arm.com>
> Cc: Thomas Gleixner <tglx@linutronix.de>
> Cc: Yuichi Ito <ito-yuichi@fujitsu.com>
> Cc: linux-kernel@vger.kernel.org
> To: linux-arm-kernel@lists.infradead.org
> ---
> drivers/irqchip/irq-gic-v3.c | 15 +++++++++++++--
> 1 file changed, 13 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c
> index 906538fa8771..593d4539a209 100644
> --- a/drivers/irqchip/irq-gic-v3.c
> +++ b/drivers/irqchip/irq-gic-v3.c
> @@ -709,6 +709,9 @@ static void gic_handle_nmi(struct pt_regs *regs)
> gic_deactivate_unhandled(irqnr);
> }
>
> +/* RESCHEDULE IPI hwirq nr is 0, and the only raw one */
> +static unsigned long raw_interrupt_mask = 1;

I'm afraid you have the wrong end of the stick. This isn't a GIC
property. This is an architecture decision, and only the architecture
can expose what they want.

M.

--
Without deviation from the norm, progress is not possible.

\
 
 \ /
  Last update: 2021-09-29 09:24    [W:0.253 / U:1.092 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site