From d1402fc708e4c355813e49df6d15bc3466ba5114 Mon Sep 17 00:00:00 2001 From: Logan Gunthorpe Date: Fri, 14 Dec 2018 14:16:53 -0800 Subject: mm: introduce common STRUCT_PAGE_MAX_SHIFT define This define is used by arm64 to calculate the size of the vmemmap region. It is defined as the log2 of the upper bound on the size of a struct page. We move it into mm_types.h so it can be defined properly instead of set and checked with a build bug. This also allows us to use the same define for riscv. Link: http://lkml.kernel.org/r/20181107205433.3875-2-logang@deltatee.com Signed-off-by: Logan Gunthorpe Acked-by: Will Deacon Acked-by: Andrew Morton Acked-by: Ard Biesheuvel Acked-by: Catalin Marinas Cc: Arnd Bergmann Cc: Christoph Hellwig Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/arm64/mm/init.c | 8 -------- 1 file changed, 8 deletions(-) (limited to 'arch/arm64/mm/init.c') diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c index 9b432d9fcada..0340e45655c6 100644 --- a/arch/arm64/mm/init.c +++ b/arch/arm64/mm/init.c @@ -610,14 +610,6 @@ void __init mem_init(void) BUILD_BUG_ON(TASK_SIZE_32 > TASK_SIZE_64); #endif -#ifdef CONFIG_SPARSEMEM_VMEMMAP - /* - * Make sure we chose the upper bound of sizeof(struct page) - * correctly when sizing the VMEMMAP array. - */ - BUILD_BUG_ON(sizeof(struct page) > (1 << STRUCT_PAGE_MAX_SHIFT)); -#endif - if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) { extern int sysctl_overcommit_memory; /* -- cgit v1.2.3