[Xen-devel] [PATCH v1 1/6] mm/memory_hotplug: make remove_memory() take the device_hotplug_lock

[David Hildenbrand <david@xxxxxxxxxx>]

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@xxxxxxxxxxxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: "Rafael J. Wysocki" <rjw@xxxxxxxxxxxxx>
Cc: Len Brown <lenb@xxxxxxxxxx>
Cc: Rashmica Gupta <rashmica.g@xxxxxxxxx>
Cc: Michael Neuling <mikey@xxxxxxxxxxx>
Cc: Balbir Singh <bsingharora@xxxxxxxxx>
Cc: Nathan Fontenot <nfont@xxxxxxxxxxxxxxxxxx>
Cc: John Allen <jallen@xxxxxxxxxxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Pavel Tatashin <pasha.tatashin@xxxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: Oscar Salvador <osalvador@xxxxxxx>
Cc: YASUAKI ISHIMATSU <yasu.isimatu@xxxxxxxxx>
Cc: Mathieu Malaterre <malat@xxxxxxxxxx>
Reviewed-by: Pavel Tatashin <pavel.tatashin@xxxxxxxxxxxxx>
Signed-off-by: David Hildenbrand <david@xxxxxxxxxx>
---
 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 */
-- 
2.17.1


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