From ea34f78f3df62e531cf2beca997ff6bfae2b1e0d Mon Sep 17 00:00:00 2001 From: Mike Rapoport Date: Mon, 14 Dec 2020 19:09:47 -0800 Subject: ia64: forbid using VIRTUAL_MEM_MAP with FLATMEM Virtual memory map was intended to avoid wasting memory on the memory map on systems with large holes in the physical memory layout. Long ago it been superseded first by DISCONTIGMEM and then by SPARSEMEM. Moreover, SPARSEMEM_VMEMMAP provide the same functionality in much more portable way. As the first step to removing the VIRTUAL_MEM_MAP forbid it's usage with FLATMEM and panic on systems with large holes in the physical memory layout that try to run FLATMEM kernels. Link: https://lkml.kernel.org/r/20201101170454.9567-7-rppt@kernel.org Signed-off-by: Mike Rapoport Cc: Alexey Dobriyan Cc: Catalin Marinas Cc: Geert Uytterhoeven Cc: Greg Ungerer Cc: John Paul Adrian Glaubitz Cc: Jonathan Corbet Cc: Matt Turner Cc: Meelis Roos Cc: Michael Schmitz Cc: Russell King Cc: Tony Luck Cc: Vineet Gupta Cc: Will Deacon Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/ia64/Kconfig | 2 +- arch/ia64/include/asm/meminit.h | 2 -- arch/ia64/mm/contig.c | 48 ++++++++++++++++++----------------------- arch/ia64/mm/init.c | 14 ------------ 4 files changed, 22 insertions(+), 44 deletions(-) (limited to 'arch/ia64') diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig index 12aae706cb27..83de0273d474 100644 --- a/arch/ia64/Kconfig +++ b/arch/ia64/Kconfig @@ -329,7 +329,7 @@ config NODES_SHIFT # VIRTUAL_MEM_MAP has been retained for historical reasons. config VIRTUAL_MEM_MAP bool "Virtual mem map" - depends on !SPARSEMEM + depends on !SPARSEMEM && !FLATMEM default y help Say Y to compile the kernel with support for a virtual mem map. diff --git a/arch/ia64/include/asm/meminit.h b/arch/ia64/include/asm/meminit.h index 092f1c91b36c..e789c0818edb 100644 --- a/arch/ia64/include/asm/meminit.h +++ b/arch/ia64/include/asm/meminit.h @@ -59,10 +59,8 @@ extern int reserve_elfcorehdr(u64 *start, u64 *end); extern int register_active_ranges(u64 start, u64 len, int nid); #ifdef CONFIG_VIRTUAL_MEM_MAP -# define LARGE_GAP 0x40000000 /* Use virtual mem map if hole is > than this */ extern unsigned long VMALLOC_END; extern struct page *vmem_map; - extern int find_largest_hole(u64 start, u64 end, void *arg); extern int create_mem_map_page_table(u64 start, u64 end, void *arg); extern int vmemmap_find_next_valid_pfn(int, int); #else diff --git a/arch/ia64/mm/contig.c b/arch/ia64/mm/contig.c index ba81d8cb0059..bfc4ecd0a2ab 100644 --- a/arch/ia64/mm/contig.c +++ b/arch/ia64/mm/contig.c @@ -19,15 +19,12 @@ #include #include #include +#include #include #include #include -#ifdef CONFIG_VIRTUAL_MEM_MAP -static unsigned long max_gap; -#endif - /* physical address where the bootmem map is located */ unsigned long bootmap_start; @@ -166,33 +163,30 @@ find_memory (void) alloc_per_cpu_data(); } -static void __init virtual_map_init(void) +static int __init find_largest_hole(u64 start, u64 end, void *arg) { -#ifdef CONFIG_VIRTUAL_MEM_MAP - efi_memmap_walk(find_largest_hole, (u64 *)&max_gap); - if (max_gap < LARGE_GAP) { - vmem_map = (struct page *) 0; - } else { - unsigned long map_size; + u64 *max_gap = arg; - /* allocate virtual_mem_map */ + static u64 last_end = PAGE_OFFSET; - map_size = PAGE_ALIGN(ALIGN(max_low_pfn, MAX_ORDER_NR_PAGES) * - sizeof(struct page)); - VMALLOC_END -= map_size; - vmem_map = (struct page *) VMALLOC_END; - efi_memmap_walk(create_mem_map_page_table, NULL); + /* NOTE: this algorithm assumes efi memmap table is ordered */ - /* - * alloc_node_mem_map makes an adjustment for mem_map - * which isn't compatible with vmem_map. - */ - NODE_DATA(0)->node_mem_map = vmem_map + - find_min_pfn_with_active_regions(); + if (*max_gap < (start - last_end)) + *max_gap = start - last_end; + last_end = end; + return 0; +} - printk("Virtual mem_map starts at 0x%p\n", mem_map); - } -#endif /* !CONFIG_VIRTUAL_MEM_MAP */ +static void __init verify_gap_absence(void) +{ + unsigned long max_gap; + + /* Forbid FLATMEM if hole is > than 1G */ + efi_memmap_walk(find_largest_hole, (u64 *)&max_gap); + if (max_gap >= SZ_1G) + panic("Cannot use FLATMEM with %ldMB hole\n" + "Please switch over to SPARSEMEM\n", + (max_gap >> 20)); } /* @@ -210,7 +204,7 @@ paging_init (void) max_zone_pfns[ZONE_DMA32] = max_dma; max_zone_pfns[ZONE_NORMAL] = max_low_pfn; - virtual_map_init(); + verify_gap_absence(); free_area_init(max_zone_pfns); zero_page_memmap_ptr = virt_to_page(ia64_imva(empty_zero_page)); diff --git a/arch/ia64/mm/init.c b/arch/ia64/mm/init.c index ef12e097f318..9b5acf8fb092 100644 --- a/arch/ia64/mm/init.c +++ b/arch/ia64/mm/init.c @@ -574,20 +574,6 @@ ia64_pfn_valid (unsigned long pfn) } EXPORT_SYMBOL(ia64_pfn_valid); -int __init find_largest_hole(u64 start, u64 end, void *arg) -{ - u64 *max_gap = arg; - - static u64 last_end = PAGE_OFFSET; - - /* NOTE: this algorithm assumes efi memmap table is ordered */ - - if (*max_gap < (start - last_end)) - *max_gap = start - last_end; - last_end = end; - return 0; -} - #endif /* CONFIG_VIRTUAL_MEM_MAP */ int __init register_active_ranges(u64 start, u64 len, int nid) -- cgit v1.2.3-58-ga151