[PATCH 1/1] arm: traps: remove fp underflow checking

[Russell King (Oracle)]

On Fri, Apr 24, 2026 at 10:00:29AM +0530, Maninder Singh wrote:
> with IRQSTACKS fp can point outside of thread's stack.
> And when there is crash reported from IRQ side, it always report
> "frame pointer underflow", which is not real underflow.
> 
> Unhandled fault: page domain fault (0x81b) at 0x00000000
> ..
> PC is at handle_irq_desc+0x68/0xa4
> LR is at generic_handle_domain_irq+0x18/0x1c
> ..
> 
> Call trace: frame pointer underflow
>  handle_irq_desc from generic_handle_domain_irq+0x18/0x1c
>  generic_handle_domain_irq from gic_handle_irq+0x78/0x8c
>  gic_handle_irq from generic_handle_arch_irq+0x3c/0x4c
> ..
> 
> It is just warning print and there is no decision based on this
> to stop backtrack or etc. So it can be removed.

Please find a way to check whether the frame pointer is within the
IRQ stack rather than removing this.

Thanks.

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