diff mbox series

[02/17] MIPS: sgi-ip27: make NODE_DATA() the same as on all other architectures

Message ID 20240716111346.3676969-3-rppt@kernel.org (mailing list archive)
State New
Headers show
Series mm: introduce numa_memblks | expand

Commit Message

Mike Rapoport July 16, 2024, 11:13 a.m. UTC 
From: "Mike Rapoport (Microsoft)" <rppt@kernel.org>

sgi-ip27 is the only system that defines NODE_DATA() differently than
the rest of NUMA machines.

Add node_data array of struct pglist pointers that will point to
__node_data[node]->pglist and redefine NODE_DATA() to use node_data
array.

This will allow pulling declaration of node_data to the generic mm code
in the next commit.

Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
---
 arch/mips/include/asm/mach-ip27/mmzone.h | 5 ++++-
 arch/mips/sgi-ip27/ip27-memory.c         | 5 ++++-
 2 files changed, 8 insertions(+), 2 deletions(-)

Comments

David Hildenbrand July 17, 2024, 2:32 p.m. UTC | #1 
On 16.07.24 13:13, Mike Rapoport wrote:
> From: "Mike Rapoport (Microsoft)" <rppt@kernel.org>
> 
> sgi-ip27 is the only system that defines NODE_DATA() differently than
> the rest of NUMA machines.
> 
> Add node_data array of struct pglist pointers that will point to
> __node_data[node]->pglist and redefine NODE_DATA() to use node_data
> array.
> 
> This will allow pulling declaration of node_data to the generic mm code
> in the next commit.
> 
> Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
> ---
>   arch/mips/include/asm/mach-ip27/mmzone.h | 5 ++++-
>   arch/mips/sgi-ip27/ip27-memory.c         | 5 ++++-
>   2 files changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/mips/include/asm/mach-ip27/mmzone.h b/arch/mips/include/asm/mach-ip27/mmzone.h
> index 08c36e50a860..629c3f290203 100644
> --- a/arch/mips/include/asm/mach-ip27/mmzone.h
> +++ b/arch/mips/include/asm/mach-ip27/mmzone.h
> @@ -22,7 +22,10 @@ struct node_data {
>   
>   extern struct node_data *__node_data[];
>   
> -#define NODE_DATA(n)		(&__node_data[(n)]->pglist)
>   #define hub_data(n)		(&__node_data[(n)]->hub)
>   
> +extern struct pglist_data *node_data[];
> +
> +#define NODE_DATA(nid)		(node_data[nid])
> +
>   #endif /* _ASM_MACH_MMZONE_H */
> diff --git a/arch/mips/sgi-ip27/ip27-memory.c b/arch/mips/sgi-ip27/ip27-memory.c
> index b8ca94cfb4fe..c30ef6958b97 100644
> --- a/arch/mips/sgi-ip27/ip27-memory.c
> +++ b/arch/mips/sgi-ip27/ip27-memory.c
> @@ -34,8 +34,10 @@
>   #define SLOT_PFNSHIFT		(SLOT_SHIFT - PAGE_SHIFT)
>   #define PFN_NASIDSHFT		(NASID_SHFT - PAGE_SHIFT)
>   
> -struct node_data *__node_data[MAX_NUMNODES];
> +struct pglist_data *node_data[MAX_NUMNODES];
> +EXPORT_SYMBOL(node_data);
>   
> +struct node_data *__node_data[MAX_NUMNODES];
>   EXPORT_SYMBOL(__node_data);
>   
>   static u64 gen_region_mask(void)
> @@ -361,6 +363,7 @@ static void __init node_mem_init(nasid_t node)
>   	 */
>   	__node_data[node] = __va(slot_freepfn << PAGE_SHIFT);
>   	memset(__node_data[node], 0, PAGE_SIZE);
> +	node_data[node] = &__node_data[node]->pglist;
>   
>   	NODE_DATA(node)->node_start_pfn = start_pfn;
>   	NODE_DATA(node)->node_spanned_pages = end_pfn - start_pfn;

I was assuming we could get rid of __node_data->pglist.

But now I am confused where that is actually set.

Anyhow

Reviewed-by: David Hildenbrand <david@redhat.com>
Jonathan Cameron July 19, 2024, 2:38 p.m. UTC | #2 
On Wed, 17 Jul 2024 16:32:59 +0200
David Hildenbrand <david@redhat.com> wrote:

> On 16.07.24 13:13, Mike Rapoport wrote:
> > From: "Mike Rapoport (Microsoft)" <rppt@kernel.org>
> > 
> > sgi-ip27 is the only system that defines NODE_DATA() differently than
> > the rest of NUMA machines.
> > 
> > Add node_data array of struct pglist pointers that will point to
> > __node_data[node]->pglist and redefine NODE_DATA() to use node_data
> > array.
> > 
> > This will allow pulling declaration of node_data to the generic mm code
> > in the next commit.
> > 
> > Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
> > ---
> >   arch/mips/include/asm/mach-ip27/mmzone.h | 5 ++++-
> >   arch/mips/sgi-ip27/ip27-memory.c         | 5 ++++-
> >   2 files changed, 8 insertions(+), 2 deletions(-)
> > 
> > diff --git a/arch/mips/include/asm/mach-ip27/mmzone.h b/arch/mips/include/asm/mach-ip27/mmzone.h
> > index 08c36e50a860..629c3f290203 100644
> > --- a/arch/mips/include/asm/mach-ip27/mmzone.h
> > +++ b/arch/mips/include/asm/mach-ip27/mmzone.h
> > @@ -22,7 +22,10 @@ struct node_data {
> >   
> >   extern struct node_data *__node_data[];
> >   
> > -#define NODE_DATA(n)		(&__node_data[(n)]->pglist)
> >   #define hub_data(n)		(&__node_data[(n)]->hub)
> >   
> > +extern struct pglist_data *node_data[];
> > +
> > +#define NODE_DATA(nid)		(node_data[nid])
> > +
> >   #endif /* _ASM_MACH_MMZONE_H */
> > diff --git a/arch/mips/sgi-ip27/ip27-memory.c b/arch/mips/sgi-ip27/ip27-memory.c
> > index b8ca94cfb4fe..c30ef6958b97 100644
> > --- a/arch/mips/sgi-ip27/ip27-memory.c
> > +++ b/arch/mips/sgi-ip27/ip27-memory.c
> > @@ -34,8 +34,10 @@
> >   #define SLOT_PFNSHIFT		(SLOT_SHIFT - PAGE_SHIFT)
> >   #define PFN_NASIDSHFT		(NASID_SHFT - PAGE_SHIFT)
> >   
> > -struct node_data *__node_data[MAX_NUMNODES];
> > +struct pglist_data *node_data[MAX_NUMNODES];
> > +EXPORT_SYMBOL(node_data);
> >   
> > +struct node_data *__node_data[MAX_NUMNODES];
> >   EXPORT_SYMBOL(__node_data);
> >   
> >   static u64 gen_region_mask(void)
> > @@ -361,6 +363,7 @@ static void __init node_mem_init(nasid_t node)
> >   	 */
> >   	__node_data[node] = __va(slot_freepfn << PAGE_SHIFT);
> >   	memset(__node_data[node], 0, PAGE_SIZE);
> > +	node_data[node] = &__node_data[node]->pglist;
> >   
> >   	NODE_DATA(node)->node_start_pfn = start_pfn;
> >   	NODE_DATA(node)->node_spanned_pages = end_pfn - start_pfn;  
> 
> I was assuming we could get rid of __node_data->pglist.
> 
> But now I am confused where that is actually set.

It looks nasty... Cast in arch_refresh_nodedata() takes
incoming pg_data_t * and casts it to the local version of
struct node_data * which I think is this one

struct node_data {
	struct pglist_data pglist; (which is pg_data_t pglist)
	struct hub_data hub;
};

https://elixir.bootlin.com/linux/v6.10/source/arch/mips/sgi-ip27/ip27-memory.c#L432

Now that pg_data_t is allocated by 
arch_alloc_nodedata() which might be fine (though types could be handled in a more
readable fashion via some container_of() magic.
https://elixir.bootlin.com/linux/v6.10/source/arch/mips/sgi-ip27/ip27-memory.c#L427

However that call is:
pg_data_t * __init arch_alloc_nodedata(int nid)
{
	return memblock_alloc(sizeof(pg_data_t), SMP_CACHE_BYTES);
}

So doesn't seem to allocate enough space to me as should be sizeof(struct node_data)

Worth cleaning up whilst here?  Proper handling of types would definitely
help.

Jonathan


> 
> Anyhow
> 
> Reviewed-by: David Hildenbrand <david@redhat.com>
>
Mike Rapoport July 22, 2024, 7:34 a.m. UTC | #3 
On Fri, Jul 19, 2024 at 03:38:52PM +0100, Jonathan Cameron wrote:
> On Wed, 17 Jul 2024 16:32:59 +0200
> David Hildenbrand <david@redhat.com> wrote:
> 
> > On 16.07.24 13:13, Mike Rapoport wrote:
> > > From: "Mike Rapoport (Microsoft)" <rppt@kernel.org>
> > > 
> > > sgi-ip27 is the only system that defines NODE_DATA() differently than
> > > the rest of NUMA machines.
> > > 
> > > Add node_data array of struct pglist pointers that will point to
> > > __node_data[node]->pglist and redefine NODE_DATA() to use node_data
> > > array.
> > > 
> > > This will allow pulling declaration of node_data to the generic mm code
> > > in the next commit.
> > > 
> > > Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
> > > ---
> > >   arch/mips/include/asm/mach-ip27/mmzone.h | 5 ++++-
> > >   arch/mips/sgi-ip27/ip27-memory.c         | 5 ++++-
> > >   2 files changed, 8 insertions(+), 2 deletions(-)
> > > 
> > > diff --git a/arch/mips/include/asm/mach-ip27/mmzone.h b/arch/mips/include/asm/mach-ip27/mmzone.h
> > > index 08c36e50a860..629c3f290203 100644
> > > --- a/arch/mips/include/asm/mach-ip27/mmzone.h
> > > +++ b/arch/mips/include/asm/mach-ip27/mmzone.h
> > > @@ -22,7 +22,10 @@ struct node_data {
> > >   
> > >   extern struct node_data *__node_data[];
> > >   
> > > -#define NODE_DATA(n)		(&__node_data[(n)]->pglist)
> > >   #define hub_data(n)		(&__node_data[(n)]->hub)
> > >   
> > > +extern struct pglist_data *node_data[];
> > > +
> > > +#define NODE_DATA(nid)		(node_data[nid])
> > > +
> > >   #endif /* _ASM_MACH_MMZONE_H */
> > > diff --git a/arch/mips/sgi-ip27/ip27-memory.c b/arch/mips/sgi-ip27/ip27-memory.c
> > > index b8ca94cfb4fe..c30ef6958b97 100644
> > > --- a/arch/mips/sgi-ip27/ip27-memory.c
> > > +++ b/arch/mips/sgi-ip27/ip27-memory.c
> > > @@ -34,8 +34,10 @@
> > >   #define SLOT_PFNSHIFT		(SLOT_SHIFT - PAGE_SHIFT)
> > >   #define PFN_NASIDSHFT		(NASID_SHFT - PAGE_SHIFT)
> > >   
> > > -struct node_data *__node_data[MAX_NUMNODES];
> > > +struct pglist_data *node_data[MAX_NUMNODES];
> > > +EXPORT_SYMBOL(node_data);
> > >   
> > > +struct node_data *__node_data[MAX_NUMNODES];
> > >   EXPORT_SYMBOL(__node_data);
> > >   
> > >   static u64 gen_region_mask(void)
> > > @@ -361,6 +363,7 @@ static void __init node_mem_init(nasid_t node)
> > >   	 */
> > >   	__node_data[node] = __va(slot_freepfn << PAGE_SHIFT);
> > >   	memset(__node_data[node], 0, PAGE_SIZE);
> > > +	node_data[node] = &__node_data[node]->pglist;
> > >   
> > >   	NODE_DATA(node)->node_start_pfn = start_pfn;
> > >   	NODE_DATA(node)->node_spanned_pages = end_pfn - start_pfn;  
> > 
> > I was assuming we could get rid of __node_data->pglist.
> > 
> > But now I am confused where that is actually set.
> 
> It looks nasty... 

Nasty indeed :)

> Cast in arch_refresh_nodedata() takes incoming pg_data_t * and casts it
> to the local version of struct node_data * which I think is this one
> 
> struct node_data {
> 	struct pglist_data pglist; (which is pg_data_t pglist)
> 	struct hub_data hub;
> };
> 
> https://elixir.bootlin.com/linux/v6.10/source/arch/mips/sgi-ip27/ip27-memory.c#L432
> 
> Now that pg_data_t is allocated by 
> arch_alloc_nodedata() which might be fine (though types could be handled in a more
> readable fashion via some container_of() magic.
> https://elixir.bootlin.com/linux/v6.10/source/arch/mips/sgi-ip27/ip27-memory.c#L427
> 
> However that call is:
> pg_data_t * __init arch_alloc_nodedata(int nid)
> {
> 	return memblock_alloc(sizeof(pg_data_t), SMP_CACHE_BYTES);
> }
> 
> So doesn't seem to allocate enough space to me as should be sizeof(struct node_data)

Well, it's there to silence a compiler error (commit f8f9f21c7848 ("MIPS:
Fix build error for loongson64 and sgi-ip27")), but this is not a proper
fix :(
Luckily nothing calls cpumask_of_node() for offline nodes...
 
> Worth cleaning up whilst here?  Proper handling of types would definitely
> help.

Worth cleanup indeed, but I'd rather drop arch_alloc_nodedata() on MIPS
altogether.
 
> Jonathan
diff mbox series

Patch

diff --git a/arch/mips/include/asm/mach-ip27/mmzone.h b/arch/mips/include/asm/mach-ip27/mmzone.h
index 08c36e50a860..629c3f290203 100644
--- a/arch/mips/include/asm/mach-ip27/mmzone.h
+++ b/arch/mips/include/asm/mach-ip27/mmzone.h
@@ -22,7 +22,10 @@  struct node_data {
 
 extern struct node_data *__node_data[];
 
-#define NODE_DATA(n)		(&__node_data[(n)]->pglist)
 #define hub_data(n)		(&__node_data[(n)]->hub)
 
+extern struct pglist_data *node_data[];
+
+#define NODE_DATA(nid)		(node_data[nid])
+
 #endif /* _ASM_MACH_MMZONE_H */
diff --git a/arch/mips/sgi-ip27/ip27-memory.c b/arch/mips/sgi-ip27/ip27-memory.c
index b8ca94cfb4fe..c30ef6958b97 100644
--- a/arch/mips/sgi-ip27/ip27-memory.c
+++ b/arch/mips/sgi-ip27/ip27-memory.c
@@ -34,8 +34,10 @@ 
 #define SLOT_PFNSHIFT		(SLOT_SHIFT - PAGE_SHIFT)
 #define PFN_NASIDSHFT		(NASID_SHFT - PAGE_SHIFT)
 
-struct node_data *__node_data[MAX_NUMNODES];
+struct pglist_data *node_data[MAX_NUMNODES];
+EXPORT_SYMBOL(node_data);
 
+struct node_data *__node_data[MAX_NUMNODES];
 EXPORT_SYMBOL(__node_data);
 
 static u64 gen_region_mask(void)
@@ -361,6 +363,7 @@  static void __init node_mem_init(nasid_t node)
 	 */
 	__node_data[node] = __va(slot_freepfn << PAGE_SHIFT);
 	memset(__node_data[node], 0, PAGE_SIZE);
+	node_data[node] = &__node_data[node]->pglist;
 
 	NODE_DATA(node)->node_start_pfn = start_pfn;
 	NODE_DATA(node)->node_spanned_pages = end_pfn - start_pfn;