linux-kernel - Re: kernel/bpf/devmap.c:1030:40: sparse: sparse: cast removes address space '_

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Date:   Wed, 1 Jun 2022 02:38:34 +0200
From:   Luc Van Oostenryck <luc.vanoostenryck@...il.com>
To:     Toke Høiland-Jørgensen <toke@...hat.com>
Cc:     kernel test robot <lkp@...el.com>, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org,
        Daniel Borkmann <daniel@...earbox.net>,
        "Paul E . McKenney" <paulmck@...nel.org>
Subject: Re: kernel/bpf/devmap.c:1030:40: sparse: sparse: cast removes
 address space '__rcu' of expression

On Mon, May 23, 2022 at 12:30:14PM +0200, Toke Høiland-Jørgensen wrote:
> kernel test robot <lkp@...el.com> writes:
> 
> > tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> > head:   eaea45fc0e7b6ae439526b4a41d91230c8517336
> > commit: 782347b6bcad07ddb574422e01e22c92e05928c8 xdp: Add proper __rcu annotations to redirect map entries
> > date:   11 months ago
> > config: ia64-randconfig-s031-20220522 (https://download.01.org/0day-ci/archive/20220522/202205222029.xpW3PM1y-lkp@intel.com/config)
> > compiler: ia64-linux-gcc (GCC) 11.3.0
> 
> Hmm, so this is ia64-only? Some kind of macro breakage? Paul, any ideas?

Hi,

It's surely IA64's cmpxchg() which contains lines like:
	_r_ = ia64_cmpxchg8_##sem((__u64 *) ptr, new, _o_); 

-- Luc