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

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Date:	Mon, 12 Nov 2012 15:23:42 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Joonsoo Kim <js1304@...il.com>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Johannes Weiner <hannes@...xchg.org>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Subject: Re: [PATCH 4/4] bootmem: fix wrong call parameter for
 free_bootmem()

On Tue, 13 Nov 2012 01:31:55 +0900
Joonsoo Kim <js1304@...il.com> 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.

Well gee, I wonder how that happened :(


How does this look?

From: Andrew Morton <akpm@...ux-foundation.org>
Subject: bootmem-fix-wrong-call-parameter-for-free_bootmem-fix

improve free_bootmem() and free_bootmem_pate() documentation

Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Cc: Haavard Skinnemoen <hskinnemoen@...il.com>
Cc: Hans-Christian Egtvedt <egtvedt@...fundet.no>
Cc: Johannes Weiner <hannes@...xchg.org>
Cc: Joonsoo Kim <js1304@...il.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
---

 include/linux/bootmem.h |    4 ++--
 mm/bootmem.c            |   20 ++++++++++----------
 2 files changed, 12 insertions(+), 12 deletions(-)

--- a/mm/bootmem.c~bootmem-fix-wrong-call-parameter-for-free_bootmem-fix
+++ a/mm/bootmem.c
@@ -147,21 +147,21 @@ unsigned long __init init_bootmem(unsign
 
 /*
  * free_bootmem_late - free bootmem pages directly to page allocator
- * @addr: starting address of the range
+ * @addr: starting physical address of the range
  * @size: size of the range in bytes
  *
  * This is only useful when the bootmem allocator has already been torn
  * down, but we are still initializing the system.  Pages are given directly
  * to the page allocator, no bootmem metadata is updated because it is gone.
  */
-void __init free_bootmem_late(unsigned long addr, unsigned long size)
+void __init free_bootmem_late(unsigned long physaddr, unsigned long size)
 {
 	unsigned long cursor, end;
 
-	kmemleak_free_part(__va(addr), size);
+	kmemleak_free_part(__va(physaddr), size);
 
-	cursor = PFN_UP(addr);
-	end = PFN_DOWN(addr + size);
+	cursor = PFN_UP(physaddr);
+	end = PFN_DOWN(physaddr + size);
 
 	for (; cursor < end; cursor++) {
 		__free_pages_bootmem(pfn_to_page(cursor), 0);
@@ -385,21 +385,21 @@ void __init free_bootmem_node(pg_data_t 
 
 /**
  * free_bootmem - mark a page range as usable
- * @addr: starting address of the range
+ * @addr: starting physical address of the range
  * @size: size of the range in bytes
  *
  * Partial pages will be considered reserved and left as they are.
  *
  * The range must be contiguous but may span node boundaries.
  */
-void __init free_bootmem(unsigned long addr, unsigned long size)
+void __init free_bootmem(unsigned long physaddr, unsigned long size)
 {
 	unsigned long start, end;
 
-	kmemleak_free_part(__va(addr), size);
+	kmemleak_free_part(__va(physaddr), size);
 
-	start = PFN_UP(addr);
-	end = PFN_DOWN(addr + size);
+	start = PFN_UP(physaddr);
+	end = PFN_DOWN(physaddr + size);
 
 	mark_bootmem(start, end, 0, 0);
 }
--- a/include/linux/bootmem.h~bootmem-fix-wrong-call-parameter-for-free_bootmem-fix
+++ a/include/linux/bootmem.h
@@ -51,8 +51,8 @@ extern unsigned long free_all_bootmem(vo
 extern void free_bootmem_node(pg_data_t *pgdat,
 			      unsigned long addr,
 			      unsigned long size);
-extern void free_bootmem(unsigned long addr, unsigned long size);
-extern void free_bootmem_late(unsigned long addr, unsigned long size);
+extern void free_bootmem(unsigned long physaddr, unsigned long size);
+extern void free_bootmem_late(unsigned long physaddr, unsigned long size);
 
 /*
  * Flags for reserve_bootmem (also if CONFIG_HAVE_ARCH_BOOTMEM_NODE,
_

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