Re: [PATCH 4/4] bootmem: fix wrong call parameter for free_bootmem()

Andrew Morton
2012-11-12T23:23:45Z

On Tue, 13 Nov 2012 01:31:55 +0900
Joonsoo Kim <js1304@gmail.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@linux-foundation.org>
Subject: bootmem-fix-wrong-call-parameter-for-free_bootmem-fix

improve free_bootmem() and free_bootmem_pate() documentation

Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Cc: Haavard Skinnemoen <hskinnemoen@gmail.com>
Cc: Hans-Christian Egtvedt <egtvedt@samfundet.no>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Joonsoo Kim <js1304@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-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,
_