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authorMike Rapoport <rppt@linux.ibm.com>2021-09-08 04:54:52 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2021-09-08 20:50:22 +0200
commit859a85ddf90e714092dea71a0e54c7b9896621be (patch)
treef5f795c1211064f086a4d4e51052109df740303c /drivers/base/node.c
parentmemory-hotplug.rst: complete admin-guide overhaul (diff)
downloadlinux-859a85ddf90e714092dea71a0e54c7b9896621be.tar.xz
linux-859a85ddf90e714092dea71a0e54c7b9896621be.zip
mm: remove pfn_valid_within() and CONFIG_HOLES_IN_ZONE
Patch series "mm: remove pfn_valid_within() and CONFIG_HOLES_IN_ZONE". After recent updates to freeing unused parts of the memory map, no architecture can have holes in the memory map within a pageblock. This makes pfn_valid_within() check and CONFIG_HOLES_IN_ZONE configuration option redundant. The first patch removes them both in a mechanical way and the second patch simplifies memory_hotplug::test_pages_in_a_zone() that had pfn_valid_within() surrounded by more logic than simple if. This patch (of 2): After recent changes in freeing of the unused parts of the memory map and rework of pfn_valid() in arm and arm64 there are no architectures that can have holes in the memory map within a pageblock and so nothing can enable CONFIG_HOLES_IN_ZONE which guards non trivial implementation of pfn_valid_within(). With that, pfn_valid_within() is always hardwired to 1 and can be completely removed. Remove calls to pfn_valid_within() and CONFIG_HOLES_IN_ZONE. Link: https://lkml.kernel.org/r/20210713080035.7464-1-rppt@kernel.org Link: https://lkml.kernel.org/r/20210713080035.7464-2-rppt@kernel.org Signed-off-by: Mike Rapoport <rppt@linux.ibm.com> Acked-by: David Hildenbrand <david@redhat.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: "Rafael J. Wysocki" <rafael@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/base/node.c')
-rw-r--r--drivers/base/node.c2
1 files changed, 0 insertions, 2 deletions
diff --git a/drivers/base/node.c b/drivers/base/node.c
index 4a4ae868ad9f..8ec6b7dfbb0f 100644
--- a/drivers/base/node.c
+++ b/drivers/base/node.c
@@ -768,8 +768,6 @@ int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
static int __ref get_nid_for_pfn(unsigned long pfn)
{
- if (!pfn_valid_within(pfn))
- return -1;
#ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
if (system_state < SYSTEM_RUNNING)
return early_pfn_to_nid(pfn);