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Subject[PATCH 05/46] hugetlb: add CONFIG_HUGETLB_HIGH_GRANULARITY_MAPPING
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This adds the Kconfig to enable or disable high-granularity mapping.
Each architecture must explicitly opt-in to it (via
ARCH_WANT_HUGETLB_HIGH_GRANULARITY_MAPPING), but when opted in, HGM will
be enabled by default if HUGETLB_PAGE is enabled.

Signed-off-by: James Houghton <jthoughton@google.com>
---
fs/Kconfig | 7 +++++++
1 file changed, 7 insertions(+)

diff --git a/fs/Kconfig b/fs/Kconfig
index 2685a4d0d353..ce2567946016 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -267,6 +267,13 @@ config HUGETLB_PAGE_OPTIMIZE_VMEMMAP_DEFAULT_ON
enable HVO by default. It can be disabled via hugetlb_free_vmemmap=off
(boot command line) or hugetlb_optimize_vmemmap (sysctl).

+config ARCH_WANT_HUGETLB_HIGH_GRANULARITY_MAPPING
+ bool
+
+config HUGETLB_HIGH_GRANULARITY_MAPPING
+ def_bool HUGETLB_PAGE
+ depends on ARCH_WANT_HUGETLB_HIGH_GRANULARITY_MAPPING
+
config MEMFD_CREATE
def_bool TMPFS || HUGETLBFS

--
2.39.0.314.g84b9a713c41-goog
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