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Message-ID: <20160503142454.GE25436@quack2.suse.cz>
Date: Tue, 3 May 2016 16:24:54 +0200
From: Jan Kara <jack@...e.cz>
To: Matthew Wilcox <willy@...ux.intel.com>
Cc: linux-kernel@...r.kernel.org,
Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
linux-fsdevel@...r.kernel.org,
Konstantin Khlebnikov <koct9i@...il.com>,
Kirill Shutemov <kirill.shutemov@...ux.intel.com>,
Jan Kara <jack@...e.com>, Neil Brown <neilb@...e.de>,
Ross Zwisler <ross.zwisler@...ux.intel.com>
Subject: Re: [PATCH v2 01/29] radix-tree: Introduce radix_tree_empty
On Thu 14-04-16 10:16:22, Matthew Wilcox wrote:
> The irqdomain code was checking for 0 or 1 entries, not 0 entries like
> the comment said they were. Introduce a new helper that will actually
> check for an empty tree.
>
> Signed-off-by: Matthew Wilcox <willy@...ux.intel.com>
> Reviewed-by: Ross Zwisler <ross.zwisler@...ux.intel.com>
The patch looks good. You can add:
Reviewed-by: Jan Kara <jack@...e.cz>
Honza
> ---
> include/linux/radix-tree.h | 5 +++++
> kernel/irq/irqdomain.c | 7 +------
> 2 files changed, 6 insertions(+), 6 deletions(-)
>
> diff --git a/include/linux/radix-tree.h b/include/linux/radix-tree.h
> index 51a97ac..83f708e 100644
> --- a/include/linux/radix-tree.h
> +++ b/include/linux/radix-tree.h
> @@ -136,6 +136,11 @@ do { \
> (root)->rnode = NULL; \
> } while (0)
>
> +static inline bool radix_tree_empty(struct radix_tree_root *root)
> +{
> + return root->rnode == NULL;
> +}
> +
> /**
> * Radix-tree synchronization
> *
> diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
> index 3a519a0..ba3f60d 100644
> --- a/kernel/irq/irqdomain.c
> +++ b/kernel/irq/irqdomain.c
> @@ -139,12 +139,7 @@ void irq_domain_remove(struct irq_domain *domain)
> {
> mutex_lock(&irq_domain_mutex);
>
> - /*
> - * radix_tree_delete() takes care of destroying the root
> - * node when all entries are removed. Shout if there are
> - * any mappings left.
> - */
> - WARN_ON(domain->revmap_tree.height);
> + WARN_ON(!radix_tree_empty(&domain->revmap_tree));
>
> list_del(&domain->link);
>
> --
> 2.8.0.rc3
>
>
--
Jan Kara <jack@...e.com>
SUSE Labs, CR
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