From ece84b390ab0ceada9c771749455f3594c36e3df Mon Sep 17 00:00:00 2001 From: "Kirill A. Shutemov" Date: Tue, 10 Feb 2015 14:08:19 -0800 Subject: [PATCH] hugetlb, x86: register 1G page size if we can allocate them at runtime After commit 944d9fec8d7a ("hugetlb: add support for gigantic page allocation at runtime") we can allocate 1G pages at runtime if CMA is enabled. Let's register 1G pages into hugetlb even if the user hasn't requested them explicitly at boot time with hugepagesz=1G. Signed-off-by: Kirill A. Shutemov Reviewed-by: Luiz Capitulino Cc: Naoya Horiguchi Cc: Andi Kleen Cc: Thomas Gleixner Cc: Ingo Molnar Cc: "H. Peter Anvin" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/x86/mm/hugetlbpage.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/arch/x86/mm/hugetlbpage.c b/arch/x86/mm/hugetlbpage.c index 8b977eb..bca0aa3 100644 --- a/arch/x86/mm/hugetlbpage.c +++ b/arch/x86/mm/hugetlbpage.c @@ -178,4 +178,15 @@ static __init int setup_hugepagesz(char *opt) return 1; } __setup("hugepagesz=", setup_hugepagesz); + +#ifdef CONFIG_CMA +static __init int gigantic_pages_init(void) +{ + /* With CMA we can allocate gigantic pages at runtime */ + if (cpu_has_gbpages && !size_to_hstate(1UL << PUD_SHIFT)) + hugetlb_add_hstate(PUD_SHIFT - PAGE_SHIFT); + return 0; +} +arch_initcall(gigantic_pages_init); +#endif #endif -- 2.7.4