linux-kernel - Re: [PATCH 05/10] uprobes: share the i_mmap

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Date:	Tue, 28 Oct 2014 03:02:24 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc:	Davidlohr Bueso <dave@...olabs.net>, akpm@...ux-foundation.org,
	hughd@...gle.com, riel@...hat.com, mgorman@...e.de,
	peterz@...radead.org, mingo@...nel.org,
	linux-kernel@...r.kernel.org, dbueso@...e.de, linux-mm@...ck.org
Subject: Re: [PATCH 05/10] uprobes: share the i_mmap_rwsem

On 10/27, Srikar Dronamraju wrote:
>
> Copying Oleg (since he should have been copied on this one)

Thanks ;)

> Please see one comment below.
>
> Acked-by: Srikar Dronamraju <srikar@...ux.vnet.ibm.com> 
>
> > ---
> >  kernel/events/uprobes.c | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> > 
> > diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
> > index 045b649..7a9e620 100644
> > --- a/kernel/events/uprobes.c
> > +++ b/kernel/events/uprobes.c
> > @@ -724,7 +724,7 @@ build_map_info(struct address_space *mapping, loff_t offset, bool is_register)
> >  	int more = 0;
> >  
> >   again:
> > -	i_mmap_lock_write(mapping);
> > +	i_mmap_lock_read(mapping);

I too think the patch is fine.

I didn't see other changes, but I hope that i_mmap_lock_write/read names
provide enough info and ->i_mmap_mutex was turned into rw-lock,  in this
case read-lock should be enough.

Oleg.

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