From: Muchun Song Subject: mm: hugetlb_vmemmap: cleanup hugetlb_free_vmemmap_enabled* The word of "free" is not expressive enough to express the feature of optimizing vmemmap pages associated with each HugeTLB, rename this keywork to "optimize". In this patch , cheanup the static key and hugetlb_free_vmemmap_enabled() to make code more expressive. Link: https://lkml.kernel.org/r/20220404074652.68024-3-songmuchun@bytedance.com Signed-off-by: Muchun Song Cc: David Hildenbrand Cc: Mike Kravetz Signed-off-by: Andrew Morton --- arch/arm64/mm/flush.c | 2 +- include/linux/page-flags.h | 12 ++++++------ mm/hugetlb_vmemmap.c | 10 +++++----- mm/memory_hotplug.c | 2 +- 4 files changed, 13 insertions(+), 13 deletions(-) --- a/arch/arm64/mm/flush.c~mm-hugetlb_vmemmap-cleanup-hugetlb_free_vmemmap_enabled +++ a/arch/arm64/mm/flush.c @@ -86,7 +86,7 @@ void flush_dcache_page(struct page *page * is reused (more details can refer to the comments above * page_fixed_fake_head()). */ - if (hugetlb_free_vmemmap_enabled() && PageHuge(page)) + if (hugetlb_optimize_vmemmap_enabled() && PageHuge(page)) page = compound_head(page); if (test_bit(PG_dcache_clean, &page->flags)) --- a/include/linux/page-flags.h~mm-hugetlb_vmemmap-cleanup-hugetlb_free_vmemmap_enabled +++ a/include/linux/page-flags.h @@ -201,16 +201,16 @@ enum pageflags { #ifdef CONFIG_HUGETLB_PAGE_FREE_VMEMMAP DECLARE_STATIC_KEY_MAYBE(CONFIG_HUGETLB_PAGE_FREE_VMEMMAP_DEFAULT_ON, - hugetlb_free_vmemmap_enabled_key); + hugetlb_optimize_vmemmap_key); -static __always_inline bool hugetlb_free_vmemmap_enabled(void) +static __always_inline bool hugetlb_optimize_vmemmap_enabled(void) { return static_branch_maybe(CONFIG_HUGETLB_PAGE_FREE_VMEMMAP_DEFAULT_ON, - &hugetlb_free_vmemmap_enabled_key); + &hugetlb_optimize_vmemmap_key); } /* - * If the feature of freeing some vmemmap pages associated with each HugeTLB + * If the feature of optimizing vmemmap pages associated with each HugeTLB * page is enabled, the head vmemmap page frame is reused and all of the tail * vmemmap addresses map to the head vmemmap page frame (furture details can * refer to the figure at the head of the mm/hugetlb_vmemmap.c). In other @@ -227,7 +227,7 @@ static __always_inline bool hugetlb_free */ static __always_inline const struct page *page_fixed_fake_head(const struct page *page) { - if (!hugetlb_free_vmemmap_enabled()) + if (!hugetlb_optimize_vmemmap_enabled()) return page; /* @@ -256,7 +256,7 @@ static inline const struct page *page_fi return page; } -static inline bool hugetlb_free_vmemmap_enabled(void) +static inline bool hugetlb_optimize_vmemmap_enabled(void) { return false; } --- a/mm/hugetlb_vmemmap.c~mm-hugetlb_vmemmap-cleanup-hugetlb_free_vmemmap_enabled +++ a/mm/hugetlb_vmemmap.c @@ -189,8 +189,8 @@ #define RESERVE_VMEMMAP_SIZE (RESERVE_VMEMMAP_NR << PAGE_SHIFT) DEFINE_STATIC_KEY_MAYBE(CONFIG_HUGETLB_PAGE_FREE_VMEMMAP_DEFAULT_ON, - hugetlb_free_vmemmap_enabled_key); -EXPORT_SYMBOL(hugetlb_free_vmemmap_enabled_key); + hugetlb_optimize_vmemmap_key); +EXPORT_SYMBOL(hugetlb_optimize_vmemmap_key); static int __init hugetlb_vmemmap_early_param(char *buf) { @@ -204,9 +204,9 @@ static int __init hugetlb_vmemmap_early_ return -EINVAL; if (!strcmp(buf, "on")) - static_branch_enable(&hugetlb_free_vmemmap_enabled_key); + static_branch_enable(&hugetlb_optimize_vmemmap_key); else if (!strcmp(buf, "off")) - static_branch_disable(&hugetlb_free_vmemmap_enabled_key); + static_branch_disable(&hugetlb_optimize_vmemmap_key); else return -EINVAL; @@ -282,7 +282,7 @@ void __init hugetlb_vmemmap_init(struct BUILD_BUG_ON(__NR_USED_SUBPAGE >= RESERVE_VMEMMAP_SIZE / sizeof(struct page)); - if (!hugetlb_free_vmemmap_enabled()) + if (!hugetlb_optimize_vmemmap_enabled()) return; vmemmap_pages = (nr_pages * sizeof(struct page)) >> PAGE_SHIFT; --- a/mm/memory_hotplug.c~mm-hugetlb_vmemmap-cleanup-hugetlb_free_vmemmap_enabled +++ a/mm/memory_hotplug.c @@ -1289,7 +1289,7 @@ bool mhp_supports_memmap_on_memory(unsig * populate a single PMD. */ return memmap_on_memory && - !hugetlb_free_vmemmap_enabled() && + !hugetlb_optimize_vmemmap_enabled() && IS_ENABLED(CONFIG_MHP_MEMMAP_ON_MEMORY) && size == memory_block_size_bytes() && IS_ALIGNED(vmemmap_size, PMD_SIZE) && _