On Tue, Feb 08, 2011 at 06:25:38PM -0500, Konrad Rzeszutek Wilk wrote:
> On Thu, Feb 03, 2011 at 05:25:14PM +0100, Daniel Kiper wrote:
> > add_registered_memory() adds memory ealier registered
> > as memory resource. It is required by memory hotplug
> > for Xen guests, however it could be used also by other
> > modules.
> >
> > Signed-off-by: Daniel Kiper <dkiper@xxxxxxxxxxxx>
> > ---
> > include/linux/memory_hotplug.h | 1 +
> > mm/memory_hotplug.c | 50
> > ++++++++++++++++++++++++++++++---------
> > 2 files changed, 39 insertions(+), 12 deletions(-)
> >
> > diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h
> > index 8122018..fe63912 100644
> > --- a/include/linux/memory_hotplug.h
> > +++ b/include/linux/memory_hotplug.h
> > @@ -223,6 +223,7 @@ static inline int is_mem_section_removable(unsigned
> > long pfn,
> > #endif /* CONFIG_MEMORY_HOTREMOVE */
> >
> > extern int mem_online_node(int nid);
> > +extern int add_registered_memory(int nid, u64 start, u64 size);
> > extern int add_memory(int nid, u64 start, u64 size);
> > extern int arch_add_memory(int nid, u64 start, u64 size);
> > extern int remove_memory(u64 start, u64 size);
> > diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
> > index 321fc74..7947bdf 100644
> > --- a/mm/memory_hotplug.c
> > +++ b/mm/memory_hotplug.c
> > @@ -532,20 +532,12 @@ out:
> > }
> >
> > /* we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG
> > */
> > -int __ref add_memory(int nid, u64 start, u64 size)
> > +static int __ref __add_memory(int nid, u64 start, u64 size)
> > {
> > pg_data_t *pgdat = NULL;
> > int new_pgdat = 0;
> > - struct resource *res;
> > int ret;
> >
> > - lock_memory_hotplug();
> > -
> > - res = register_memory_resource(start, size);
> > - ret = -EEXIST;
> > - if (!res)
> > - goto out;
> > -
> > if (!node_online(nid)) {
> > pgdat = hotadd_new_pgdat(nid, start);
> > ret = -ENOMEM;
> > @@ -579,14 +571,48 @@ int __ref add_memory(int nid, u64 start, u64 size)
> > goto out;
> >
> > error:
> > - /* rollback pgdat allocation and others */
> > + /* rollback pgdat allocation */
> > if (new_pgdat)
> > rollback_node_hotadd(nid, pgdat);
> > - if (res)
> > - release_memory_resource(res);
> > +
> > +out:
> > + return ret;
> > +}
> > +
> > +int add_registered_memory(int nid, u64 start, u64 size)
> > +{
> > + int ret;
> > +
> > + lock_memory_hotplug();
> > + ret = __add_memory(nid, start, size);
> > + unlock_memory_hotplug();
>
> Isn't this a duplicate call to the mutex?
> The __add_memory does an unlock_memory_hotplug when it finishes
> and then you do another unlock_memory_hotplug here too.
No. Calls to lock_memory_hotplug()/unlock_memory_hotplug() were
moved from original add_memory() to add_registered_memory()
and new add_memory().
Daniel
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