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Date:   Sat, 21 Sep 2019 19:49:46 -0700
From:   Jakub Kicinski <>
To:     Arnd Bergmann <>
Cc:     Giuseppe Cavallaro <>,
        Alexandre Torgue <>,
        Jose Abreu <>,
        "David S. Miller" <>,
        Maxime Coquelin <>,,,,
Subject: Re: [PATCH] [v2] net: stmmac: selftest: avoid large stack usage

On Thu, 19 Sep 2019 14:33:43 +0200, Arnd Bergmann wrote:
> Putting a struct stmmac_rss object on the stack is a bad idea,
> as it exceeds the warning limit for a stack frame on 32-bit architectures:
> drivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c:1221:12: error: stack frame size of 1208 bytes in function '__stmmac_test_l3filt' [-Werror,-Wframe-larger-than=]
> drivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c:1338:12: error: stack frame size of 1208 bytes in function '__stmmac_test_l4filt' [-Werror,-Wframe-larger-than=]
> As the object is the trivial empty case, change the called function
> to accept a NULL pointer to mean the same thing and remove the
> large variable in the two callers.
> Fixes: 4647e021193d ("net: stmmac: selftests: Add selftest for L3/L4 Filters")
> Signed-off-by: Arnd Bergmann <>

Applied, thank you!

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