From: Andrew Morton <akpm@linux-foundation.org>
To: Michal Nazarewicz <mina86@mina86.com>
Cc: linux-kernel@vger.kernel.org,
Gilad Ben-Yossef <gilad@benyossef.com>,
Chris Metcalf <cmetcalf@tilera.com>,
Christoph Lameter <cl@linux-foundation.org>,
Frederic Weisbecker <fweisbec@gmail.com>,
Russell King <linux@arm.linux.org.uk>,
linux-mm@kvack.org, Pekka Enberg <penberg@kernel.org>,
Matt Mackall <mpm@selenic.com>,
Sasha Levin <levinsasha928@gmail.com>,
Rik van Riel <riel@redhat.com>, Andi Kleen <andi@firstfloor.org>,
Alexander Viro <viro@zeniv.linux.org.uk>,
linux-fsdevel@vger.kernel.org, Avi Kivity <avi@redhat.com>,
Kosaki Motohiro <kosaki.motohiro@gmail.com>,
Milton Miller <miltonm@bga.com>
Subject: Re: [PATCH v8 4/8] smp: add func to IPI cpus based on parameter func
Date: Wed, 8 Feb 2012 16:03:44 -0800 [thread overview]
Message-ID: <20120208160344.88d187e5.akpm@linux-foundation.org> (raw)
In-Reply-To: <op.v9csppvv3l0zgt@mpn-glaptop>
On Wed, 08 Feb 2012 10:30:51 +0100
"Michal Nazarewicz" <mina86@mina86.com> wrote:
> > } while (0)
> > +/*
> > + * Preemption is disabled here to make sure the
> > + * cond_func is called under the same condtions in UP
> > + * and SMP.
> > + */
> > +#define on_each_cpu_cond(cond_func, func, info, wait, gfp_flags) \
> > + do { \
>
> How about:
>
> void *__info = (info);
>
> as to avoid double execution.
Yup. How does this look?
From: Andrew Morton <akpm@linux-foundation.org>
Subject: smp-add-func-to-ipi-cpus-based-on-parameter-func-update-fix
- avoid double-evaluation of `info' (per Michal)
- parenthesise evaluation of `cond_func'
Cc: "Srivatsa S. Bhat" <srivatsa.bhat@linux.vnet.ibm.com>
Cc: Gilad Ben-Yossef <gilad@benyossef.com>
Cc: Michal Nazarewicz <mina86@mina86.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
include/linux/smp.h | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
--- a/include/linux/smp.h~smp-add-func-to-ipi-cpus-based-on-parameter-func-update-fix
+++ a/include/linux/smp.h
@@ -168,10 +168,11 @@ static inline int up_smp_call_function(s
*/
#define on_each_cpu_cond(cond_func, func, info, wait, gfp_flags)\
do { \
+ void *__info = (info); \
preempt_disable(); \
- if (cond_func(0, info)) { \
+ if ((cond_func)(0, __info)) { \
local_irq_disable(); \
- (func)(info); \
+ (func)(__info); \
local_irq_enable(); \
} \
preempt_enable(); \
_
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next prev parent reply other threads:[~2012-02-09 0:03 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-05 13:33 [PATCH v8 0/8] Reduce cross CPU IPI interference Gilad Ben-Yossef
2012-02-05 13:44 ` [PATCH v8 1/8] smp: introduce a generic on_each_cpu_mask function Gilad Ben-Yossef
2012-02-05 15:18 ` Srivatsa S. Bhat
2012-02-05 13:48 ` [PATCH v8 2/8] arm: move arm over to generic on_each_cpu_mask Gilad Ben-Yossef
2012-02-05 13:48 ` [PATCH v8 3/8] tile: move tile to use " Gilad Ben-Yossef
2012-02-05 13:48 ` [PATCH v8 4/8] smp: add func to IPI cpus based on parameter func Gilad Ben-Yossef
2012-02-05 15:36 ` Srivatsa S. Bhat
2012-02-05 15:46 ` Gilad Ben-Yossef
2012-02-05 16:00 ` Srivatsa S. Bhat
2012-02-05 16:03 ` Srivatsa S. Bhat
2012-02-08 9:30 ` Michal Nazarewicz
2012-02-09 0:03 ` Andrew Morton [this message]
2012-02-09 8:08 ` Gilad Ben-Yossef
2012-02-09 8:13 ` Andrew Morton
2012-02-09 9:53 ` Gilad Ben-Yossef
2012-02-05 13:48 ` [PATCH v8 5/8] slub: only IPI CPUs that have per cpu obj to flush Gilad Ben-Yossef
2012-02-05 13:48 ` [PATCH v8 6/8] fs: only send IPI to invalidate LRU BH when needed Gilad Ben-Yossef
2012-02-05 13:48 ` [PATCH v8 7/8] mm: only IPI CPUs to drain local pages if they exist Gilad Ben-Yossef
2012-02-08 9:33 ` Michal Nazarewicz
2012-02-09 8:09 ` Gilad Ben-Yossef
2012-02-05 13:48 ` [PATCH v8 8/8] mm: add vmstat counters for tracking PCP drains Gilad Ben-Yossef
2012-02-08 9:36 ` [PATCH v8 0/8] Reduce cross CPU IPI interference Michal Nazarewicz
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