linux-kernel - Re: [RFC 2/2] wl3501_cs: reduce stack size for KASAN

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Message-ID: <87mv7sisr3.fsf@codeaurora.org>
Date:   Tue, 25 Jul 2017 15:52:00 +0300
From:   Kalle Valo <kvalo@...eaurora.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     x86@...nel.org, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H . Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
        linux-wireless@...r.kernel.org
Subject: Re: [RFC 2/2] wl3501_cs: reduce stack size for KASAN

Arnd Bergmann <arnd@...db.de> writes:

> Inlining functions with local variables can lead to excessive stack usage
> with KASAN after a previous patch that modifies the outsb/insb helpers
> on x86.
>
> drivers/net/wireless/wl3501_cs.c: In function 'wl3501_rx_interrupt':
> drivers/net/wireless/wl3501_cs.c:1103:1: error: the frame size of 2232 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]
>
> Marking the two callers of insb/outb 'noinline' prevents the compiler
> from adding up the stack usage for each of the local variables passed
> into those, reducing the maximum stack frame size to 800 bytes with
> KASAN again.
>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Arnd, based on the discussion I'm dropping. Please let me know if I
should take this still.

-- 
Kalle Valo