On Wed, 22 Dec 2010 17:38:44 -0800 (PST) David Rientjes <rientjes@xxxxxxxxxx> wrote:
> On Wed, 22 Dec 2010, Andrew Morton wrote:
>
> > > Index: linux-hpe4/mm/memory_hotplug.c
> > > ===================================================================
> > > --- linux-hpe4.orig/mm/memory_hotplug.c 2010-11-30 12:40:43.757622001 +0800
> > > +++ linux-hpe4/mm/memory_hotplug.c 2010-11-30 14:02:33.877622002 +0800
> > > @@ -924,3 +924,63 @@
> > > }
> > > #endif /* CONFIG_MEMORY_HOTREMOVE */
> > > EXPORT_SYMBOL_GPL(remove_memory);
> > > +
> > > +#ifdef CONFIG_DEBUG_FS
> > > +#include <linux/debugfs.h>
> > > +
> > > +static struct dentry *memhp_debug_root;
> > > +
> > > +static ssize_t add_node_store(struct file *file, const char __user *buf,
> > > + size_t count, loff_t *ppos)
> > > +{
> > > + nodemask_t mask;
> >
> > NODEMASK_ALLOC()?
> >
>
> We traditionally haven't been using NODEMASK_ALLOC() in sysfs (or, in this
> case, debugfs) functions because they're never deep in a call chain. Even
> for 4K node support, which isn't a supported config on any arch that
> allows CONFIG_MEMORY_HOTPLUG, this would only be 512 bytes on the short
> stack.
I bet linux-2.6.227 supports a meganode.
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