The patch titled
Subject: mm/memory_hotplug: introduce add_pages
has been removed from the -mm tree. Its filename was
mm-memory_hotplug-introduce-add_pages.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Michal Hocko <mhocko@xxxxxxxx>
Subject: mm/memory_hotplug: introduce add_pages
There are new users of memory hotplug emerging. Some of them require
different subset of arch_add_memory. There are some which only require
allocation of struct pages without mapping those pages to the kernel
address space. We currently have __add_pages for that purpose. But this
is rather lowlevel and not very suitable for the code outside of the
memory hotplug. E.g. x86_64 wants to update max_pfn which should be done
by the caller. Introduce add_pages() which should care about those
details if they are needed. Each architecture should define its
implementation and select CONFIG_ARCH_HAS_ADD_PAGES. All others use the
currently existing __add_pages.
Link: http://lkml.kernel.org/r/20170817000548.32038-7-jglisse@xxxxxxxxxx
Signed-off-by: Michal Hocko <mhocko@xxxxxxxx>
Signed-off-by: Jérôme Glisse <jglisse@xxxxxxxxxx>
Acked-by: Balbir Singh <bsingharora@xxxxxxxxx>
Cc: Aneesh Kumar <aneesh.kumar@xxxxxxxxxxxxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: David Nellans <dnellans@xxxxxxxxxx>
Cc: Evgeny Baskakov <ebaskakov@xxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: John Hubbard <jhubbard@xxxxxxxxxx>
Cc: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Mark Hairgrove <mhairgrove@xxxxxxxxxx>
Cc: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
Cc: Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx>
Cc: Sherry Cheung <SCheung@xxxxxxxxxx>
Cc: Subhash Gutti <sgutti@xxxxxxxxxx>
Cc: Vladimir Davydov <vdavydov.dev@xxxxxxxxx>
Cc: Bob Liu <liubo95@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/x86/Kconfig | 4 ++++
arch/x86/mm/init_64.c | 22 +++++++++++++++-------
include/linux/memory_hotplug.h | 11 +++++++++++
3 files changed, 30 insertions(+), 7 deletions(-)
diff -puN arch/x86/Kconfig~mm-memory_hotplug-introduce-add_pages arch/x86/Kconfig
--- a/arch/x86/Kconfig~mm-memory_hotplug-introduce-add_pages
+++ a/arch/x86/Kconfig
@@ -2323,6 +2323,10 @@ source "kernel/livepatch/Kconfig"
endmenu
+config ARCH_HAS_ADD_PAGES
+ def_bool y
+ depends on X86_64 && ARCH_ENABLE_MEMORY_HOTPLUG
+
config ARCH_ENABLE_MEMORY_HOTPLUG
def_bool y
depends on X86_64 || (X86_32 && HIGHMEM)
diff -puN arch/x86/mm/init_64.c~mm-memory_hotplug-introduce-add_pages arch/x86/mm/init_64.c
--- a/arch/x86/mm/init_64.c~mm-memory_hotplug-introduce-add_pages
+++ a/arch/x86/mm/init_64.c
@@ -761,7 +761,7 @@ void __init paging_init(void)
* After memory hotplug the variables max_pfn, max_low_pfn and high_memory need
* updating.
*/
-static void update_end_of_memory_vars(u64 start, u64 size)
+static void update_end_of_memory_vars(u64 start, u64 size)
{
unsigned long end_pfn = PFN_UP(start + size);
@@ -772,22 +772,30 @@ static void update_end_of_memory_vars(u
}
}
-int arch_add_memory(int nid, u64 start, u64 size, bool want_memblock)
+int add_pages(int nid, unsigned long start_pfn,
+ unsigned long nr_pages, bool want_memblock)
{
- unsigned long start_pfn = start >> PAGE_SHIFT;
- unsigned long nr_pages = size >> PAGE_SHIFT;
int ret;
- init_memory_mapping(start, start + size);
-
ret = __add_pages(nid, start_pfn, nr_pages, want_memblock);
WARN_ON_ONCE(ret);
/* update max_pfn, max_low_pfn and high_memory */
- update_end_of_memory_vars(start, size);
+ update_end_of_memory_vars(start_pfn << PAGE_SHIFT,
+ nr_pages << PAGE_SHIFT);
return ret;
}
+
+int arch_add_memory(int nid, u64 start, u64 size, bool want_memblock)
+{
+ unsigned long start_pfn = start >> PAGE_SHIFT;
+ unsigned long nr_pages = size >> PAGE_SHIFT;
+
+ init_memory_mapping(start, start + size);
+
+ return add_pages(nid, start_pfn, nr_pages, want_memblock);
+}
EXPORT_SYMBOL_GPL(arch_add_memory);
#define PAGE_INUSE 0xFD
diff -puN include/linux/memory_hotplug.h~mm-memory_hotplug-introduce-add_pages include/linux/memory_hotplug.h
--- a/include/linux/memory_hotplug.h~mm-memory_hotplug-introduce-add_pages
+++ a/include/linux/memory_hotplug.h
@@ -133,6 +133,17 @@ extern int __remove_pages(struct zone *z
extern int __add_pages(int nid, unsigned long start_pfn,
unsigned long nr_pages, bool want_memblock);
+#ifndef CONFIG_ARCH_HAS_ADD_PAGES
+static inline int add_pages(int nid, unsigned long start_pfn,
+ unsigned long nr_pages, bool want_memblock)
+{
+ return __add_pages(nid, start_pfn, nr_pages, want_memblock);
+}
+#else /* ARCH_HAS_ADD_PAGES */
+int add_pages(int nid, unsigned long start_pfn,
+ unsigned long nr_pages, bool want_memblock);
+#endif /* ARCH_HAS_ADD_PAGES */
+
#ifdef CONFIG_NUMA
extern int memory_add_physaddr_to_nid(u64 start);
#else
_
Patches currently in -mm which might be from mhocko@xxxxxxxx are
mm-memory_hotplug-do-not-back-off-draining-pcp-free-pages-from-kworker-context.patch
treewide-remove-gfp_temporary-allocation-flag.patch
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