diff options
| author | KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> | 2007-10-16 01:26:10 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-16 09:43:01 -0700 |
| commit | 75884fb1c6388f3713ddcca662f3647b3129aaeb (patch) | |
| tree | 7debdd89fd94d099de3d3763b47af00ef6359d9d /kernel | |
| parent | 48f13bf3e742fca8aab87f6c39451d03bf5952d4 (diff) | |
memory unplug: memory hotplug cleanup
A clean up patch for "scanning memory resource [start, end)" operation.
Now, find_next_system_ram() function is used in memory hotplug, but this
interface is not easy to use and codes are complicated.
This patch adds walk_memory_resouce(start,len,arg,func) function.
The function 'func' is called per valid memory resouce range in [start,pfn).
[pbadari@us.ibm.com: Error handling in walk_memory_resource()]
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Badari Pulavarty <pbadari@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/resource.c | 26 |
1 files changed, 25 insertions, 1 deletions
diff --git a/kernel/resource.c b/kernel/resource.c index 9bd14fd3e6d..a358142ff48 100644 --- a/kernel/resource.c +++ b/kernel/resource.c @@ -234,7 +234,7 @@ EXPORT_SYMBOL(release_resource); * the caller must specify res->start, res->end, res->flags. * If found, returns 0, res is overwritten, if not found, returns -1. */ -int find_next_system_ram(struct resource *res) +static int find_next_system_ram(struct resource *res) { resource_size_t start, end; struct resource *p; @@ -267,6 +267,30 @@ int find_next_system_ram(struct resource *res) res->end = p->end; return 0; } +int +walk_memory_resource(unsigned long start_pfn, unsigned long nr_pages, void *arg, + int (*func)(unsigned long, unsigned long, void *)) +{ + struct resource res; + unsigned long pfn, len; + u64 orig_end; + int ret = -1; + res.start = (u64) start_pfn << PAGE_SHIFT; + res.end = ((u64)(start_pfn + nr_pages) << PAGE_SHIFT) - 1; + res.flags = IORESOURCE_MEM; + orig_end = res.end; + while ((res.start < res.end) && (find_next_system_ram(&res) >= 0)) { + pfn = (unsigned long)(res.start >> PAGE_SHIFT); + len = (unsigned long)((res.end + 1 - res.start) >> PAGE_SHIFT); + ret = (*func)(pfn, len, arg); + if (ret) + break; + res.start = res.end + 1; + res.end = orig_end; + } + return ret; +} + #endif /* |