diff mbox series

[v1,1/6] mm/memory_hotplug: make remove_memory() take the device_hotplug_lock

Message ID 20180918114822.21926-2-david@redhat.com (mailing list archive)
State Not Applicable
Headers show
Series mm: online/offline_pages called w.o. mem_hotplug_lock | expand

Commit Message

David Hildenbrand Sept. 18, 2018, 11:48 a.m. UTC 
remove_memory() is exported right now but requires the
device_hotplug_lock, which is not exported. So let's provide a variant
that takes the lock and only export that one.

The lock is already held in
	arch/powerpc/platforms/pseries/hotplug-memory.c
	drivers/acpi/acpi_memhotplug.c
So, let's use the locked variant.

The lock is not held (but taken in)
	arch/powerpc/platforms/powernv/memtrace.c
So let's keep using the (now) locked variant.

Apart from that, there are not other users in the tree.

Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: Len Brown <lenb@kernel.org>
Cc: Rashmica Gupta <rashmica.g@gmail.com>
Cc: Michael Neuling <mikey@neuling.org>
Cc: Balbir Singh <bsingharora@gmail.com>
Cc: Nathan Fontenot <nfont@linux.vnet.ibm.com>
Cc: John Allen <jallen@linux.vnet.ibm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Pavel Tatashin <pasha.tatashin@oracle.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: YASUAKI ISHIMATSU <yasu.isimatu@gmail.com>
Cc: Mathieu Malaterre <malat@debian.org>
Reviewed-by: Pavel Tatashin <pavel.tatashin@microsoft.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
---
 arch/powerpc/platforms/powernv/memtrace.c       | 2 --
 arch/powerpc/platforms/pseries/hotplug-memory.c | 6 +++---
 drivers/acpi/acpi_memhotplug.c                  | 2 +-
 include/linux/memory_hotplug.h                  | 3 ++-
 mm/memory_hotplug.c                             | 9 ++++++++-
 5 files changed, 14 insertions(+), 8 deletions(-)

Comments

Rafael J. Wysocki Sept. 18, 2018, 9:18 p.m. UTC | #1 
On Tue, Sep 18, 2018 at 1:48 PM David Hildenbrand <david@redhat.com> wrote:
>
> remove_memory() is exported right now but requires the
> device_hotplug_lock, which is not exported. So let's provide a variant
> that takes the lock and only export that one.
>
> The lock is already held in
>         arch/powerpc/platforms/pseries/hotplug-memory.c
>         drivers/acpi/acpi_memhotplug.c
> So, let's use the locked variant.
>
> The lock is not held (but taken in)
>         arch/powerpc/platforms/powernv/memtrace.c
> So let's keep using the (now) locked variant.
>
> Apart from that, there are not other users in the tree.
>
> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
> Cc: Paul Mackerras <paulus@samba.org>
> Cc: Michael Ellerman <mpe@ellerman.id.au>
> Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
> Cc: Len Brown <lenb@kernel.org>
> Cc: Rashmica Gupta <rashmica.g@gmail.com>
> Cc: Michael Neuling <mikey@neuling.org>
> Cc: Balbir Singh <bsingharora@gmail.com>
> Cc: Nathan Fontenot <nfont@linux.vnet.ibm.com>
> Cc: John Allen <jallen@linux.vnet.ibm.com>
> Cc: Andrew Morton <akpm@linux-foundation.org>
> Cc: Michal Hocko <mhocko@suse.com>
> Cc: Dan Williams <dan.j.williams@intel.com>
> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
> Cc: Vlastimil Babka <vbabka@suse.cz>
> Cc: Pavel Tatashin <pasha.tatashin@oracle.com>
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: Oscar Salvador <osalvador@suse.de>
> Cc: YASUAKI ISHIMATSU <yasu.isimatu@gmail.com>
> Cc: Mathieu Malaterre <malat@debian.org>
> Reviewed-by: Pavel Tatashin <pavel.tatashin@microsoft.com>
> Signed-off-by: David Hildenbrand <david@redhat.com>
> ---
>  arch/powerpc/platforms/powernv/memtrace.c       | 2 --
>  arch/powerpc/platforms/pseries/hotplug-memory.c | 6 +++---
>  drivers/acpi/acpi_memhotplug.c                  | 2 +-
>  include/linux/memory_hotplug.h                  | 3 ++-
>  mm/memory_hotplug.c                             | 9 ++++++++-
>  5 files changed, 14 insertions(+), 8 deletions(-)
>
> diff --git a/arch/powerpc/platforms/powernv/memtrace.c b/arch/powerpc/platforms/powernv/memtrace.c
> index 51dc398ae3f7..8f1cd4f3bfd5 100644
> --- a/arch/powerpc/platforms/powernv/memtrace.c
> +++ b/arch/powerpc/platforms/powernv/memtrace.c
> @@ -90,9 +90,7 @@ static bool memtrace_offline_pages(u32 nid, u64 start_pfn, u64 nr_pages)
>         walk_memory_range(start_pfn, end_pfn, (void *)MEM_OFFLINE,
>                           change_memblock_state);
>
> -       lock_device_hotplug();
>         remove_memory(nid, start_pfn << PAGE_SHIFT, nr_pages << PAGE_SHIFT);
> -       unlock_device_hotplug();
>
>         return true;
>  }
> diff --git a/arch/powerpc/platforms/pseries/hotplug-memory.c b/arch/powerpc/platforms/pseries/hotplug-memory.c
> index c1578f54c626..b3f54466e25f 100644
> --- a/arch/powerpc/platforms/pseries/hotplug-memory.c
> +++ b/arch/powerpc/platforms/pseries/hotplug-memory.c
> @@ -334,7 +334,7 @@ static int pseries_remove_memblock(unsigned long base, unsigned int memblock_siz
>         nid = memory_add_physaddr_to_nid(base);
>
>         for (i = 0; i < sections_per_block; i++) {
> -               remove_memory(nid, base, MIN_MEMORY_BLOCK_SIZE);
> +               __remove_memory(nid, base, MIN_MEMORY_BLOCK_SIZE);
>                 base += MIN_MEMORY_BLOCK_SIZE;
>         }
>
> @@ -423,7 +423,7 @@ static int dlpar_remove_lmb(struct drmem_lmb *lmb)
>         block_sz = pseries_memory_block_size();
>         nid = memory_add_physaddr_to_nid(lmb->base_addr);
>
> -       remove_memory(nid, lmb->base_addr, block_sz);
> +       __remove_memory(nid, lmb->base_addr, block_sz);
>
>         /* Update memory regions for memory remove */
>         memblock_remove(lmb->base_addr, block_sz);
> @@ -710,7 +710,7 @@ static int dlpar_add_lmb(struct drmem_lmb *lmb)
>
>         rc = dlpar_online_lmb(lmb);
>         if (rc) {
> -               remove_memory(nid, lmb->base_addr, block_sz);
> +               __remove_memory(nid, lmb->base_addr, block_sz);
>                 dlpar_remove_device_tree_lmb(lmb);
>         } else {
>                 lmb->flags |= DRCONF_MEM_ASSIGNED;
> diff --git a/drivers/acpi/acpi_memhotplug.c b/drivers/acpi/acpi_memhotplug.c
> index 6b0d3ef7309c..811148415993 100644
> --- a/drivers/acpi/acpi_memhotplug.c
> +++ b/drivers/acpi/acpi_memhotplug.c
> @@ -282,7 +282,7 @@ static void acpi_memory_remove_memory(struct acpi_memory_device *mem_device)
>                         nid = memory_add_physaddr_to_nid(info->start_addr);
>
>                 acpi_unbind_memory_blocks(info);
> -               remove_memory(nid, info->start_addr, info->length);
> +               __remove_memory(nid, info->start_addr, info->length);
>                 list_del(&info->list);
>                 kfree(info);
>         }
> diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h
> index 34a28227068d..1f096852f479 100644
> --- a/include/linux/memory_hotplug.h
> +++ b/include/linux/memory_hotplug.h
> @@ -301,6 +301,7 @@ extern bool is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
>  extern void try_offline_node(int nid);
>  extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
>  extern void remove_memory(int nid, u64 start, u64 size);
> +extern void __remove_memory(int nid, u64 start, u64 size);
>
>  #else
>  static inline bool is_mem_section_removable(unsigned long pfn,
> @@ -317,6 +318,7 @@ static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
>  }
>
>  static inline void remove_memory(int nid, u64 start, u64 size) {}
> +static inline void __remove_memory(int nid, u64 start, u64 size) {}
>  #endif /* CONFIG_MEMORY_HOTREMOVE */
>
>  extern void __ref free_area_init_core_hotplug(int nid);
> @@ -330,7 +332,6 @@ extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn,
>                 unsigned long nr_pages, struct vmem_altmap *altmap);
>  extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
>  extern bool is_memblock_offlined(struct memory_block *mem);
> -extern void remove_memory(int nid, u64 start, u64 size);
>  extern int sparse_add_one_section(struct pglist_data *pgdat,
>                 unsigned long start_pfn, struct vmem_altmap *altmap);
>  extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms,
> diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
> index 38d94b703e9d..b8b1bd970322 100644
> --- a/mm/memory_hotplug.c
> +++ b/mm/memory_hotplug.c
> @@ -1873,7 +1873,7 @@ EXPORT_SYMBOL(try_offline_node);
>   * and online/offline operations before this call, as required by
>   * try_offline_node().
>   */
> -void __ref remove_memory(int nid, u64 start, u64 size)
> +void __ref __remove_memory(int nid, u64 start, u64 size)
>  {
>         int ret;
>
> @@ -1902,5 +1902,12 @@ void __ref remove_memory(int nid, u64 start, u64 size)
>
>         mem_hotplug_done();
>  }
> +
> +void remove_memory(int nid, u64 start, u64 size)
> +{
> +       lock_device_hotplug();
> +       __remove_memory(nid, start, size);
> +       unlock_device_hotplug();
> +}
>  EXPORT_SYMBOL_GPL(remove_memory);
>  #endif /* CONFIG_MEMORY_HOTREMOVE */
> --

Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
diff mbox series

Patch

diff --git a/arch/powerpc/platforms/powernv/memtrace.c b/arch/powerpc/platforms/powernv/memtrace.c
index 51dc398ae3f7..8f1cd4f3bfd5 100644
--- a/arch/powerpc/platforms/powernv/memtrace.c
+++ b/arch/powerpc/platforms/powernv/memtrace.c
@@ -90,9 +90,7 @@  static bool memtrace_offline_pages(u32 nid, u64 start_pfn, u64 nr_pages)
 	walk_memory_range(start_pfn, end_pfn, (void *)MEM_OFFLINE,
 			  change_memblock_state);
 
-	lock_device_hotplug();
 	remove_memory(nid, start_pfn << PAGE_SHIFT, nr_pages << PAGE_SHIFT);
-	unlock_device_hotplug();
 
 	return true;
 }
diff --git a/arch/powerpc/platforms/pseries/hotplug-memory.c b/arch/powerpc/platforms/pseries/hotplug-memory.c
index c1578f54c626..b3f54466e25f 100644
--- a/arch/powerpc/platforms/pseries/hotplug-memory.c
+++ b/arch/powerpc/platforms/pseries/hotplug-memory.c
@@ -334,7 +334,7 @@  static int pseries_remove_memblock(unsigned long base, unsigned int memblock_siz
 	nid = memory_add_physaddr_to_nid(base);
 
 	for (i = 0; i < sections_per_block; i++) {
-		remove_memory(nid, base, MIN_MEMORY_BLOCK_SIZE);
+		__remove_memory(nid, base, MIN_MEMORY_BLOCK_SIZE);
 		base += MIN_MEMORY_BLOCK_SIZE;
 	}
 
@@ -423,7 +423,7 @@  static int dlpar_remove_lmb(struct drmem_lmb *lmb)
 	block_sz = pseries_memory_block_size();
 	nid = memory_add_physaddr_to_nid(lmb->base_addr);
 
-	remove_memory(nid, lmb->base_addr, block_sz);
+	__remove_memory(nid, lmb->base_addr, block_sz);
 
 	/* Update memory regions for memory remove */
 	memblock_remove(lmb->base_addr, block_sz);
@@ -710,7 +710,7 @@  static int dlpar_add_lmb(struct drmem_lmb *lmb)
 
 	rc = dlpar_online_lmb(lmb);
 	if (rc) {
-		remove_memory(nid, lmb->base_addr, block_sz);
+		__remove_memory(nid, lmb->base_addr, block_sz);
 		dlpar_remove_device_tree_lmb(lmb);
 	} else {
 		lmb->flags |= DRCONF_MEM_ASSIGNED;
diff --git a/drivers/acpi/acpi_memhotplug.c b/drivers/acpi/acpi_memhotplug.c
index 6b0d3ef7309c..811148415993 100644
--- a/drivers/acpi/acpi_memhotplug.c
+++ b/drivers/acpi/acpi_memhotplug.c
@@ -282,7 +282,7 @@  static void acpi_memory_remove_memory(struct acpi_memory_device *mem_device)
 			nid = memory_add_physaddr_to_nid(info->start_addr);
 
 		acpi_unbind_memory_blocks(info);
-		remove_memory(nid, info->start_addr, info->length);
+		__remove_memory(nid, info->start_addr, info->length);
 		list_del(&info->list);
 		kfree(info);
 	}
diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h
index 34a28227068d..1f096852f479 100644
--- a/include/linux/memory_hotplug.h
+++ b/include/linux/memory_hotplug.h
@@ -301,6 +301,7 @@  extern bool is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
 extern void try_offline_node(int nid);
 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
 extern void remove_memory(int nid, u64 start, u64 size);
+extern void __remove_memory(int nid, u64 start, u64 size);
 
 #else
 static inline bool is_mem_section_removable(unsigned long pfn,
@@ -317,6 +318,7 @@  static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
 }
 
 static inline void remove_memory(int nid, u64 start, u64 size) {}
+static inline void __remove_memory(int nid, u64 start, u64 size) {}
 #endif /* CONFIG_MEMORY_HOTREMOVE */
 
 extern void __ref free_area_init_core_hotplug(int nid);
@@ -330,7 +332,6 @@  extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn,
 		unsigned long nr_pages, struct vmem_altmap *altmap);
 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
 extern bool is_memblock_offlined(struct memory_block *mem);
-extern void remove_memory(int nid, u64 start, u64 size);
 extern int sparse_add_one_section(struct pglist_data *pgdat,
 		unsigned long start_pfn, struct vmem_altmap *altmap);
 extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms,
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 38d94b703e9d..b8b1bd970322 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1873,7 +1873,7 @@  EXPORT_SYMBOL(try_offline_node);
  * and online/offline operations before this call, as required by
  * try_offline_node().
  */
-void __ref remove_memory(int nid, u64 start, u64 size)
+void __ref __remove_memory(int nid, u64 start, u64 size)
 {
 	int ret;
 
@@ -1902,5 +1902,12 @@  void __ref remove_memory(int nid, u64 start, u64 size)
 
 	mem_hotplug_done();
 }
+
+void remove_memory(int nid, u64 start, u64 size)
+{
+	lock_device_hotplug();
+	__remove_memory(nid, start, size);
+	unlock_device_hotplug();
+}
 EXPORT_SYMBOL_GPL(remove_memory);
 #endif /* CONFIG_MEMORY_HOTREMOVE */