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SubjectRe: [PATCH] memory hotplug: Refuse to add unaligned memory regions
于 2011/9/15 4:26, Anton Blanchard 写道:
>
> The sysfs memory probe interface allows unaligned regions
> to be added:
>
> # echo 0xffffff> /sys/devices/system/memory/probe
>
> # cat /proc/iomem
> 00ffffff-01fffffe : System RAM
> 01ffffff-02fffffe : System RAM
> 02ffffff-03fffffe : System RAM
> 03ffffff-04fffffe : System RAM
> 04ffffff-05fffffe : System RAM
>
> Return -EINVAL instead of creating these bad regions.
>
> Signed-off-by: Anton Blanchard<anton@samba.org>
> ---
>
> Index: linux-build/drivers/base/memory.c
> ===================================================================
> --- linux-build.orig/drivers/base/memory.c 2011-08-11 08:25:55.005941391 +1000
> +++ linux-build/drivers/base/memory.c 2011-08-11 08:28:27.938580440 +1000
> @@ -380,9 +380,13 @@ memory_probe_store(struct class *class,
> u64 phys_addr;
> int nid;
> int i, ret;
> + unsigned long pages_per_block = PAGES_PER_SECTION * sections_per_block;
>
> phys_addr = simple_strtoull(buf, NULL, 0);
>
> + if (phys_addr& ((pages_per_block<< PAGE_SHIFT) - 1))
> + return -EINVAL;
> +
> for (i = 0; i< sections_per_block; i++) {
> nid = memory_add_physaddr_to_nid(phys_addr);
> ret = add_memory(nid, phys_addr,
> --

what platform doese it affect? PowerPC or else?

As I know, on x86 platform it should not use this interface: *probe*,
instead of acpi_hotplug_xxx. But PowerPC is RISC so how can you add
such weird address for it? Maybe it is because PowerPC uses 16M as
one section size and you assign a wrong address to it intentionally.
The final result is as you show, isn't it?

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