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Subject: Re: [patch 26/35] net: brcmfmac: Convey allocation mode as argument
To:     Thomas Gleixner <tglx@linutronix.de>,
        LKML <linux-kernel@vger.kernel.org>
Cc:     Peter Zijlstra <peterz@infradead.org>,
        Linus Torvalds <torvalds@linuxfoundation.org>,
        Paul McKenney <paulmck@kernel.org>,
        Matthew Wilcox <willy@infradead.org>,
        Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
        Franky Lin <franky.lin@broadcom.com>,
        Hante Meuleman <hante.meuleman@broadcom.com>,
        Chi-Hsien Lin <chi-hsien.lin@cypress.com>,
        Wright Feng <wright.feng@cypress.com>,
        Kalle Valo <kvalo@codeaurora.org>,
        "David S. Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>,
        linux-wireless@vger.kernel.org,
        brcm80211-dev-list.pdl@broadcom.com,
        brcm80211-dev-list@cypress.com, netdev@vger.kernel.org,
        Christian Benvenuti <benve@cisco.com>,
        Govindarajulu Varadarajan <_govind@gmx.com>,
        Jonathan Corbet <corbet@lwn.net>,
        Mauro Carvalho Chehab <mchehab+huawei@kernel.org>,
        linux-doc@vger.kernel.org,
        Luc Van Oostenryck <luc.vanoostenryck@gmail.com>,
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        Pensando Drivers <drivers@pensando.io>,
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        Heiner Kallweit <hkallweit1@gmail.com>,
        Russell King <linux@armlinux.org.uk>,
        Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
        Solarflare linux maintainers <linux-net-drivers@solarflare.com>,
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        Jon Mason <jdmason@kudzu.us>, Daniel Drake <dsd@gentoo.org>,
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        Johannes Berg <johannes.berg@intel.com>,
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        Jouni Malinen <j@w1.fi>,
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        Xinming Hu <huxinming820@gmail.com>,
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        Pascal Terjan <pterjan@google.com>,
        Ping-Ke Shih <pkshih@realtek.com>
References: <20200927194846.045411263@linutronix.de>
 <20200927194922.444952084@linutronix.de>
From:   Arend Van Spriel <arend.vanspriel@broadcom.com>
Message-ID: <aac2b8b3-53f4-9b27-03d0-742bbe3cd81f@broadcom.com>
Date:   Mon, 28 Sep 2020 11:34:22 +0200
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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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