linux-kernel - Re: [PATCH v10 09/69] mm: add VMA iterator

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Message-ID: <YrScxyQ5RRYYZFrj@casper.infradead.org>
Date:   Thu, 23 Jun 2022 18:03:03 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     David Hildenbrand <david@...hat.com>
Cc:     Liam Howlett <liam.howlett@...cle.com>,
        "maple-tree@...ts.infradead.org" <maple-tree@...ts.infradead.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "damon @ lists . linux . dev" <damon@...ts.linux.dev>,
        SeongJae Park <sj@...nel.org>
Subject: Re: [PATCH v10 09/69] mm: add VMA iterator

On Tue, Jun 21, 2022 at 11:10:09PM +0200, David Hildenbrand wrote:
> > +#define VMA_ITERATOR(name, mm, addr) 					\
> > +	struct vma_iterator name = {					\
> > +		.mas = {						\
> > +			.tree = &mm->mm_mt,				\
> > +			.index = addr,					\
> > +			.node = MAS_START,				\
> > +		},							\
> > +	}
> > +
> 
> No __* and () macro magic?
> 
> I'd have expected at least
> 
> tree = &(__mm)->mm_mt,
> .index = (__addr),
> 
> ;)

Fair, fair.  Just testing that change now.  I always forget to do those
things until they bite me.

> Reviewed-by: David Hildenbrand <david@...hat.com>

Appreciate the review!

diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index acbd8d03e01e..8bcbffefdc02 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -686,11 +686,11 @@ struct vma_iterator {
 	struct ma_state mas;
 };
 
-#define VMA_ITERATOR(name, mm, addr) 					\
+#define VMA_ITERATOR(name, _mm, _addr)	 				\
 	struct vma_iterator name = {					\
 		.mas = {						\
-			.tree = &mm->mm_mt,				\
-			.index = addr,					\
+			.tree = &(_mm)->mm_mt,				\
+			.index = (_addr),				\
 			.node = MAS_START,				\
 		},							\
 	}