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authorMichal Hocko <mhocko@suse.com>2017-09-08 16:11:39 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-09-08 18:26:46 -0700
commit3072e413e305e353cd4654f8a57d953b66e85bf3 (patch)
tree8b3d1fd0db081bdbfc58c31a8c590a48ba0cccce /arch
parent74eee180b935fcb9b83a56dd7648fb75caf38f0e (diff)
downloadlinux-3072e413e305e353cd4654f8a57d953b66e85bf3.tar.bz2
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@redhat.com Signed-off-by: Michal Hocko <mhocko@suse.com> Signed-off-by: Jérôme Glisse <jglisse@redhat.com> Acked-by: Balbir Singh <bsingharora@gmail.com> Cc: Aneesh Kumar <aneesh.kumar@linux.vnet.ibm.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Dan Williams <dan.j.williams@intel.com> Cc: David Nellans <dnellans@nvidia.com> Cc: Evgeny Baskakov <ebaskakov@nvidia.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: John Hubbard <jhubbard@nvidia.com> Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Mark Hairgrove <mhairgrove@nvidia.com> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Ross Zwisler <ross.zwisler@linux.intel.com> Cc: Sherry Cheung <SCheung@nvidia.com> Cc: Subhash Gutti <sgutti@nvidia.com> Cc: Vladimir Davydov <vdavydov.dev@gmail.com> Cc: Bob Liu <liubo95@huawei.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/Kconfig4
-rw-r--r--arch/x86/mm/init_64.c22
2 files changed, 19 insertions, 7 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 07d9b6c75328..a3e6e6136a47 100644
--- a/arch/x86/Kconfig
+++ b/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 --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 136422d7d539..048fbe8fc274 100644
--- a/arch/x86/mm/init_64.c
+++ b/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(u64 start, u64 size)
}
}
-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