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SubjectRe: [patch 26/35] net: brcmfmac: Convey allocation mode as argument
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On 9/27/2020 9:49 PM, Thomas Gleixner wrote:
> From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
>
> The usage of in_interrupt() in drivers is phased out and Linus clearly
> requested that code which changes behaviour depending on context should
> either be seperated or the context be conveyed in an argument passed by the
> caller, which usually knows the context.
>
> brcmf_fweh_process_event() uses in_interrupt() to select the allocation
> mode GFP_KERNEL/GFP_ATOMIC. Aside of the above reasons this check is
> incomplete as it cannot detect contexts which just have preemption or
> interrupts disabled.
>
> All callchains leading to brcmf_fweh_process_event() can clearly identify
> the calling context. Convey a 'gfp' argument through the callchains and let
> the callers hand in the appropriate GFP mode.
>
> This has also the advantage that any change of execution context or
> preemption/interrupt state in these callchains will be detected by the
> memory allocator for all GFP_KERNEL allocations.

Looking at the functions changed I see overlap with patch 25/35 so maybe
change to gfp flag to a 'in_isr' bool. The flag can then be used for
dealing with netif_rx as well.

Regards,
Arend
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