diff options
| author |   Mike Rapoport <rppt@linux.ibm.com> | 2020-12-14 19:09:47 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2020-12-15 12:13:42 -0800 |
| commit | ea34f78f3df62e531cf2beca997ff6bfae2b1e0d (patch) | |
| tree | 077a5c262a15c180ccb3fd7d4305cdc7c0e70dfc /arch/ia64/include/asm/meminit.h | |
| parent | ia64: split virtual map initialization out of paging_init() (diff) | |
| download | linux-dev-ea34f78f3df62e531cf2beca997ff6bfae2b1e0d.tar.xz linux-dev-ea34f78f3df62e531cf2beca997ff6bfae2b1e0d.zip | |
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superseded first by DISCONTIGMEM and then by SPARSEMEM.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 <rppt@linux.ibm.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Greg Ungerer <gerg@linux-m68k.org>
Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Meelis Roos <mroos@linux.ee>
Cc: Michael Schmitz <schmitzmic@gmail.com>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Vineet Gupta <vgupta@synopsys.com>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/ia64/include/asm/meminit.h')
| -rw-r--r-- | arch/ia64/include/asm/meminit.h | 2 |
1 files changed, 0 insertions, 2 deletions
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 |