linux-kernel - [PATCH] relax free_area() for compatibility with free

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Date:	Fri, 26 Mar 2010 16:30:49 +0000
From:	"Jan Beulich" <JBeulich@...ell.com>
To:	<yinghai@...nel.org>, <hpa@...or.com>
Cc:	<linux-kernel@...r.kernel.org>
Subject: [PATCH] relax free_area() for compatibility with
	 free_bootmem()

To be compatible with the traditional free_bootmem() (which is just a
wrapper around free_earl() under CONFIG_NO_BOOTMEM), free_area()
should allow freeing not only exact ranges, but also proper subsets.
This is still different from free_early_partial() in that the latter
also handles an input range spanning multiple reserved ranges,
possibly even with holes between them (not that I think permitting
this is a good idea).

Signed-off-by: Jan Beulich <jbeulich@...ell.com>

---
 kernel/early_res.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- linux-2.6.34-rc2/kernel/early_res.c	2010-03-25 15:23:45.000000000 +0100
+++ 2.6.34-rc2-free_early-subrange/kernel/early_res.c	2010-03-26 14:49:41.000000000 +0100
@@ -321,11 +321,11 @@ void __init free_early(u64 start, u64 en
 
 	i = find_overlapped_early(start, end);
 	r = &early_res[i];
-	if (i >= max_early_res || r->end != end || r->start != start)
+	if (i >= max_early_res || r->end < end || r->start > start)
 		panic("free_early on not reserved area: %llx-%llx!",
 			 start, end - 1);
 
-	drop_range(i);
+	drop_range_partial(i, start, end);
 }
 
 void __init free_early_partial(u64 start, u64 end)



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