linux-kernel - Re: [PATCH 4/4] bootmem: fix wrong call parameter for free

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Message-ID: <20121113011027.GE10092@cmpxchg.org>
Date:	Mon, 12 Nov 2012 20:10:27 -0500
From:	Johannes Weiner <hannes@...xchg.org>
To:	Joonsoo Kim <js1304@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: Re: [PATCH 4/4] bootmem: fix wrong call parameter for free_bootmem()

On Tue, Nov 13, 2012 at 01:31:55AM +0900, Joonsoo Kim wrote:
> It is somehow strange that alloc_bootmem return virtual address
> and free_bootmem require physical address.
> Anyway, free_bootmem()'s first parameter should be physical address.
> 
> There are some call sites for free_bootmem() with virtual address.
> So fix them.
> 
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> Signed-off-by: Joonsoo Kim <js1304@...il.com>

Found another one, attached below.  The free_bootmem() in
arch/powerpc/platforms/82xx/pq2ads-pci-pic.c looks also fishy, since
it's applied to memory from kzalloc().  Ben?

Signed-off-by: Johannes Weiner <hannes@...xchg.org>
---

diff --git a/drivers/macintosh/smu.c b/drivers/macintosh/smu.c
index 7d5a6b4..1963680 100644
--- a/drivers/macintosh/smu.c
+++ b/drivers/macintosh/smu.c
@@ -565,7 +565,7 @@ int __init smu_init (void)
 fail_db_node:
 	of_node_put(smu->db_node);
 fail_bootmem:
-	free_bootmem((unsigned long)smu, sizeof(struct smu_device));
+	free_bootmem(__pa(smu), sizeof(struct smu_device));
 	smu = NULL;
 fail_np:
 	of_node_put(np);
--
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