linux-kernel - Re: [PATCH 06/16] ia64: fix up obsolete cpu function usage.

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Message-ID: <CA+8MBbLiSWmptfsWO8zmkquq7KsojThU7m7sLxhbwLX1co0YGw@mail.gmail.com>
Date:	Wed, 27 May 2015 10:37:01 -0700
From:	Tony Luck <tony.luck@...il.com>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Fenghua Yu <fenghua.yu@...el.com>,
	"linux-ia64@...r.kernel.org" <linux-ia64@...r.kernel.org>
Subject: Re: [PATCH 06/16] ia64: fix up obsolete cpu function usage.

On Tue, May 26, 2015 at 6:18 PM, Rusty Russell <rusty@...tcorp.com.au> wrote:

> cpumask_test_cpu() doesn't take volatile, unlike the obsoleted
> cpu_isset.  The only place ia64 really cares is the spin waiting for a
> bit; udelay() is probably a barrier but insert rmb() to be sure.

Good to be sure ... but cpumask_test_cpu() simply calls test_bit() ...
and 2 out of 3 versions of that function throw "volatile" back into the
mix: :-)

Global definition: test_bit

  File                            Line
0 include/asm/bitops.h            334 test_bit (int nr, const volatile
void *addr)
1 asm-generic/bitops/non-atomic.h 103 static inline int test_bit(int
nr, const volatile unsigned long *addr)
2 asm-generic/bitops/atomic.h      16 static __always_inline int
test_bit(unsigned int nr, const unsigned long *addr)
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