On Thu, Oct 08, 2020 at 12:45:30PM +0530, Maninder Singh wrote:

Observed Stack Overflow on 8KB kernel stack on ARM specially 
incase on network interrupts, which results in undeterministic behaviour. 
So there is need for per cpu dedicated IRQ stack for ARM.

As ARm does not have extra co-processor register
to save thread info pointer, IRQ stack will be at some
performance cost, so code is under CONFIG_IRQ_STACK.

and we don't have much knowledge and set up for CLANG
and ARM_UNWIND, so dependency added for both cases.

Tested patch set with QEMU for latest kernel
and 4.1 kernel for ARM target with same patch set.

You need to investigate and show where and why this is happening. My
guess is you have a network driver that uses a lot of kernel stack
space, which itself would be a bug.

Note that there are compiler versions out there that mis-optimise and
eat stack space - the kernel build should be warning if a function
uses a large amount of stack.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last!

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