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Date:	Tue, 16 Dec 2014 15:22:27 -0800
From:	Eric Dumazet <>
To:	Hannes Frederic Sowa <>
Cc:	Sasha Levin <>,
	"David S. Miller" <>,
	LKML <>,,
	Andrey Ryabinin <>,
	Dave Jones <>
Subject: Re: net: integer overflow in ip_idents_reserve

On Wed, 2014-12-17 at 00:09 +0100, Hannes Frederic Sowa wrote:

> Also we compile the whole kernel with -fno-strict-overflow, so every
> report of signed overflow leading to undefined behavior is probably a
> false positive. I don't know if it is worth to try to get rid of them, I
> doubt it.

Presumably we could have uatomic_t , or atomic_u32_t, whatever...

This particular xadd() is heavily hit in some cases, we really do not
want a cmpxchg()

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