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Subject[patch] mm: node-setup agnostic free_bootmem()

* Johannes Weiner <hannes@saeurebad.de> wrote:

> > so i very much agree that your changes are cleaner, i just wanted to
> > have one that has all the fixes included.
>
> I had planned this to be another patch because there are more then one
> boundary check I wanted to tighten. I can merge them though if you
> like.

no, better to have them in separate patches.

> > Would you like to post a patch against current -git or should i
> > extract the cleaner reserve_bootmem() from your previous patch?
>
> I just moved and have only sporadic internet access and free time
> slots available. Would be nice if you could do it!

sure, find the merged patch below, against latest -git, boot-tested on
x86. Is this what you had in mind?

Ingo

---------------->
Subject: mm: node-setup agnostic free_bootmem()
From: Johannes Weiner <hannes@saeurebad.de>
Date: Wed, 16 Apr 2008 13:36:31 +0200

Make free_bootmem() look up the node holding the specified address
range which lets it work transparently on single-node and multi-node
configurations.

If the address range exceeds the node range, it well be marked free
across node boundaries, too.

Signed-off-by: Johannes Weiner <hannes@saeurebad.de>
CC: Andi Kleen <andi@firstfloor.org>
CC: Yinghai Lu <yhlu.kernel@gmail.com>
CC: Yasunori Goto <y-goto@jp.fujitsu.com>
CC: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
CC: Christoph Lameter <clameter@sgi.com>
CC: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
mm/bootmem.c | 27 +++++++++++++++++++++++++--
1 file changed, 25 insertions(+), 2 deletions(-)

Index: linux-x86.q/mm/bootmem.c
===================================================================
--- linux-x86.q.orig/mm/bootmem.c
+++ linux-x86.q/mm/bootmem.c
@@ -493,8 +493,31 @@ int __init reserve_bootmem(unsigned long
void __init free_bootmem(unsigned long addr, unsigned long size)
{
bootmem_data_t *bdata;
- list_for_each_entry(bdata, &bdata_list, list)
- free_bootmem_core(bdata, addr, size);
+ unsigned long pos = addr;
+ unsigned long partsize = size;
+
+ list_for_each_entry(bdata, &bdata_list, list) {
+ unsigned long remainder = 0;
+
+ if (pos < bdata->node_boot_start)
+ continue;
+
+ if (PFN_DOWN(pos + partsize) > bdata->node_low_pfn) {
+ remainder = PFN_DOWN(pos + partsize) - bdata->node_low_pfn;
+ partsize -= remainder;
+ }
+
+ free_bootmem_core(bdata, pos, partsize);
+
+ if (!remainder)
+ return;
+
+ pos = PFN_PHYS(bdata->node_low_pfn + 1);
+ }
+ printk(KERN_ERR "free_bootmem: request: addr=%lx, size=%lx, "
+ "state: pos=%lx, partsize=%lx\n", addr, size,
+ pos, partsize);
+ BUG();
}

unsigned long __init free_all_bootmem(void)

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