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Date: Fri, 29 Aug 2008 01:13:12 -0700
From: Yinghai Lu <yhlu.kernel@...il.com>
To: Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
"H. Peter Anvin" <hpa@...or.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Jesse Barnes <jbarnes@...tuousgeek.org>,
Linus Torvalds <torvalds@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org, Yinghai Lu <yhlu.kernel@...il.com>
Subject: [PATCH] x86: split e820 reserved entries record to late v4 - fix
try to insert_resource second time, by expand the resource...
for case: e820 reserved entry is partially overlapped with bar res...
hope it will never happen
Signed-off-by: Yinghai Lu <yhlu.kernel@...il.com>
---
arch/x86/kernel/e820.c | 32 ++++++++++++++++++++++++++++++--
include/linux/ioport.h | 1 +
kernel/resource.c | 35 ++++++++++++++++++++++++++---------
3 files changed, 57 insertions(+), 11 deletions(-)
Index: linux-2.6/arch/x86/kernel/e820.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/e820.c
+++ linux-2.6/arch/x86/kernel/e820.c
@@ -1319,8 +1319,36 @@ void __init e820_reserve_resources_late(
res = e820_res;
for (i = 0; i < e820.nr_map; i++) {
- if (!res->parent && res->end)
- insert_resource(&iomem_resource, res);
+ if (!res->parent && res->end) {
+ struct resource *ret;
+
+ ret = __insert_resource(&iomem_resource, res);
+ if (ret) {
+ int updated = 0;
+
+ printk(KERN_WARNING "found conflict: %s [%08llx, %08llx] with %s [%08llx, %08llx]\n",
+ res->name, res->start, res->end,
+ ret->name, ret->start, ret->end);
+ if (res->start > ret->start && res->start <= ret->end) {
+ if (i && ret->start > e820_res[i-1].end) {
+ res->start = ret->start;
+ updated = 1;
+ }
+ } else if (res->end > ret->start && res->end <= ret->end) {
+ if (i < (e820.nr_map - 1) && ret->end > e820_res[i+1].start) {
+ res->end = ret->end;
+ updated = 1;
+ }
+ }
+ if (updated) {
+ ret = __insert_resource(&iomem_resource, res);
+ if (ret)
+ printk(KERN_WARNING "second try found conflict: %s [%08llx, %08llx] with %s [%08llx, %08llx]\n",
+ res->name, res->start, res->end,
+ ret->name, ret->start, ret->end);
+ }
+ }
+ }
res++;
}
}
Index: linux-2.6/include/linux/ioport.h
===================================================================
--- linux-2.6.orig/include/linux/ioport.h
+++ linux-2.6/include/linux/ioport.h
@@ -108,6 +108,7 @@ extern struct resource iomem_resource;
extern int request_resource(struct resource *root, struct resource *new);
extern int release_resource(struct resource *new);
+extern struct resource *__insert_resource(struct resource *parent, struct resource *new);
extern int insert_resource(struct resource *parent, struct resource *new);
extern int allocate_resource(struct resource *root, struct resource *new,
resource_size_t size, resource_size_t min,
Index: linux-2.6/kernel/resource.c
===================================================================
--- linux-2.6.orig/kernel/resource.c
+++ linux-2.6/kernel/resource.c
@@ -363,11 +363,11 @@ int allocate_resource(struct resource *r
EXPORT_SYMBOL(allocate_resource);
/**
- * insert_resource - Inserts a resource in the resource tree
+ * __insert_resource - Inserts a resource in the resource tree
* @parent: parent of the new resource
* @new: new resource to insert
*
- * Returns 0 on success, -EBUSY if the resource can't be inserted.
+ * Returns NULL on success, or first conflict resource.
*
* This function is equivalent to request_resource when no conflict
* happens. If a conflict happens, and the conflicting resources
@@ -375,20 +375,20 @@ EXPORT_SYMBOL(allocate_resource);
* resource is inserted and the conflicting resources become children of
* the new resource.
*/
-int insert_resource(struct resource *parent, struct resource *new)
+struct resource *__insert_resource(struct resource *parent, struct resource *new)
{
- int result;
+ struct resource *ret_res;
struct resource *first, *next;
write_lock(&resource_lock);
for (;; parent = first) {
- result = 0;
+ ret_res = NULL;
first = __request_resource(parent, new);
if (!first)
goto out;
- result = -EBUSY;
+ ret_res = first;
if (first == parent)
goto out;
@@ -400,15 +400,17 @@ int insert_resource(struct resource *par
for (next = first; ; next = next->sibling) {
/* Partial overlap? Bad, and unfixable */
- if (next->start < new->start || next->end > new->end)
+ if (next->start < new->start || next->end > new->end) {
+ ret_res = next;
goto out;
+ }
if (!next->sibling)
break;
if (next->sibling->start > new->end)
break;
}
- result = 0;
+ ret_res = NULL;
new->parent = parent;
new->sibling = next->sibling;
@@ -429,10 +431,25 @@ int insert_resource(struct resource *par
out:
write_unlock(&resource_lock);
- return result;
+ return ret_res;
}
/**
+ * insert_resource - Inserts a resource in the resource tree
+ * @parent: parent of the new resource
+ * @new: new resource to insert
+ *
+ * Returns 0 on success, -EBUSY if the resource can't be inserted.
+ */
+int insert_resource(struct resource *parent, struct resource *new)
+{
+ struct resource *res_conflict;
+
+ res_conflict = __insert_resource(parent, new);
+
+ return res_conflict ? -EBUSY : 0;
+}
+/**
* adjust_resource - modify a resource's start and size
* @res: resource to modify
* @start: new start value
--
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