CC to Dave Hanse.
Hello Dave,
I think following patch works both x86 and ppc. but I'm not ppc
expert. So I'm glad
if you double check it.
thank you.
<intentional full quote>
> When our x86 box calls __remove_pages(), release_mem_region() shows
> many warnings. And x86 box cannot unregister iomem_resource.
>
> "Trying to free nonexistent resource <XXXXXXXXXXXXXXXX-YYYYYYYYYYYYYYYY>"
>
> release_mem_region() has been changed as called in each PAGES_PER_SECTION
> chunk since applying a patch(de7f0cba96786c). Because powerpc registers
> iomem_resource in each PAGES_PER_SECTION chunk. But when I hot add memory
> on x86 box, iomem_resource is register in each _CRS not PAGES_PER_SECTION
> chunk. So x86 box unregisters iomem_resource.
>
> The patch fixes the problem.
>
> CC: David Rientjes <rientjes@xxxxxxxxxx>
> CC: Jiang Liu <liuj97@xxxxxxxxx>
> CC: Len Brown <len.brown@xxxxxxxxx>
> CC: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
> CC: Paul Mackerras <paulus@xxxxxxxxx>
> CC: Christoph Lameter <cl@xxxxxxxxx>
> Cc: Minchan Kim <minchan.kim@xxxxxxxxx>
> CC: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
> CC: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
> CC: Wen Congyang <wency@xxxxxxxxxxxxxx>
> Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@xxxxxxxxxxxxxx>
> ---
> arch/powerpc/platforms/pseries/hotplug-memory.c | 13 +++++++++----
> mm/memory_hotplug.c | 4 ++--
> 2 files changed, 11 insertions(+), 6 deletions(-)
>
> Index: linux-3.6/arch/powerpc/platforms/pseries/hotplug-memory.c
> ===================================================================
> --- linux-3.6.orig/arch/powerpc/platforms/pseries/hotplug-memory.c 2012-10-04 14:22:59.833520792 +0900
> +++ linux-3.6/arch/powerpc/platforms/pseries/hotplug-memory.c 2012-10-04 14:23:05.150521411 +0900
> @@ -77,7 +77,8 @@ static int pseries_remove_memblock(unsig
> {
> unsigned long start, start_pfn;
> struct zone *zone;
> - int ret;
> + int i, ret;
> + int sections_to_remove;
>
> start_pfn = base >> PAGE_SHIFT;
>
> @@ -97,9 +98,13 @@ static int pseries_remove_memblock(unsig
> * to sysfs "state" file and we can't remove sysfs entries
> * while writing to it. So we have to defer it to here.
> */
> - ret = __remove_pages(zone, start_pfn, memblock_size >> PAGE_SHIFT);
> - if (ret)
> - return ret;
> + sections_to_remove = (memblock_size >> PAGE_SHIFT) / PAGES_PER_SECTION;
> + for (i = 0; i < sections_to_remove; i++) {
> + unsigned long pfn = start_pfn + i * PAGES_PER_SECTION;
> + ret = __remove_pages(zone, start_pfn, PAGES_PER_SECTION);
> + if (ret)
> + return ret;
> + }
>
> /*
> * Update memory regions for memory remove
> Index: linux-3.6/mm/memory_hotplug.c
> ===================================================================
> --- linux-3.6.orig/mm/memory_hotplug.c 2012-10-04 14:22:59.829520788 +0900
> +++ linux-3.6/mm/memory_hotplug.c 2012-10-04 14:23:25.860527278 +0900
> @@ -362,11 +362,11 @@ int __remove_pages(struct zone *zone, un
> BUG_ON(phys_start_pfn & ~PAGE_SECTION_MASK);
> BUG_ON(nr_pages % PAGES_PER_SECTION);
>
> + release_mem_region(phys_start_pfn << PAGE_SHIFT, nr_pages * PAGE_SIZE);
> +
> sections_to_remove = nr_pages / PAGES_PER_SECTION;
> for (i = 0; i < sections_to_remove; i++) {
> unsigned long pfn = phys_start_pfn + i*PAGES_PER_SECTION;
> - release_mem_region(pfn << PAGE_SHIFT,
> - PAGES_PER_SECTION << PAGE_SHIFT);
> ret = __remove_section(zone, __pfn_to_section(pfn));
> if (ret)
> break;
>
> --
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