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x86/mm: Drop deprecated DISCONTIGMEM support for 32-bit

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The DISCONTIGMEM support was marked as deprecated in v5.2 and since there
were no complaints about it for almost 5 releases it can be completely
removed.

Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Acked-by: Dave Hansen <dave.hansen@linux.intel.com>
Link: https://lkml.kernel.org/r/20200223094322.15206-1-rppt@kernel.org
This commit is contained in:
Mike Rapoport 2020-02-23 11:43:22 +02:00 committed by Borislav Petkov
parent e027a2bc93
commit 431732651c
4 changed files with 1 additions and 84 deletions
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9
arch/x86/Kconfig
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@ -1610,19 +1610,10 @@ config NODES_SHIFT
Specify the maximum number of NUMA Nodes available on the target
system. Increases memory reserved to accommodate various tables.
config ARCH_HAVE_MEMORY_PRESENT
def_bool y
depends on X86_32 && DISCONTIGMEM
config ARCH_FLATMEM_ENABLE
def_bool y
depends on X86_32 && !NUMA
config ARCH_DISCONTIGMEM_ENABLE
def_bool n
depends on NUMA && X86_32
depends on BROKEN
config ARCH_SPARSEMEM_ENABLE
def_bool y
depends on X86_64 || NUMA || X86_32 || X86_32_NON_STANDARD

39
arch/x86/include/asm/mmzone_32.h
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@ -14,43 +14,4 @@ extern struct pglist_data *node_data[];
#define NODE_DATA(nid) (node_data[nid])
#endif /* CONFIG_NUMA */
#ifdef CONFIG_DISCONTIGMEM
/*
* generic node memory support, the following assumptions apply:
*
* 1) memory comes in 64Mb contiguous chunks which are either present or not
* 2) we will not have more than 64Gb in total
*
* for now assume that 64Gb is max amount of RAM for whole system
* 64Gb / 4096bytes/page = 16777216 pages
*/
#define MAX_NR_PAGES 16777216
#define MAX_SECTIONS 1024
#define PAGES_PER_SECTION (MAX_NR_PAGES/MAX_SECTIONS)
extern s8 physnode_map[];
static inline int pfn_to_nid(unsigned long pfn)
{
#ifdef CONFIG_NUMA
return((int) physnode_map[(pfn) / PAGES_PER_SECTION]);
#else
return 0;
#endif
}
static inline int pfn_valid(int pfn)
{
int nid = pfn_to_nid(pfn);
if (nid >= 0)
return (pfn < node_end_pfn(nid));
return 0;
}
#define early_pfn_valid(pfn) pfn_valid((pfn))
#endif /* CONFIG_DISCONTIGMEM */
#endif /* _ASM_X86_MMZONE_32_H */

3
arch/x86/include/asm/pgtable_32.h
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@ -66,8 +66,7 @@ do { \
#endif /* !__ASSEMBLY__ */
/*
* kern_addr_valid() is (1) for FLATMEM and (0) for
* SPARSEMEM and DISCONTIGMEM
* kern_addr_valid() is (1) for FLATMEM and (0) for SPARSEMEM
*/
#ifdef CONFIG_FLATMEM
#define kern_addr_valid(addr) (1)

34
arch/x86/mm/numa_32.c
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@ -27,40 +27,6 @@
#include "numa_internal.h"
#ifdef CONFIG_DISCONTIGMEM
/*
* 4) physnode_map - the mapping between a pfn and owning node
* physnode_map keeps track of the physical memory layout of a generic
* numa node on a 64Mb break (each element of the array will
* represent 64Mb of memory and will be marked by the node id. so,
* if the first gig is on node 0, and the second gig is on node 1
* physnode_map will contain:
*
* physnode_map[0-15] = 0;
* physnode_map[16-31] = 1;
* physnode_map[32- ] = -1;
*/
s8 physnode_map[MAX_SECTIONS] __read_mostly = { [0 ... (MAX_SECTIONS - 1)] = -1};
EXPORT_SYMBOL(physnode_map);
void memory_present(int nid, unsigned long start, unsigned long end)
{
unsigned long pfn;
printk(KERN_INFO "Node: %d, start_pfn: %lx, end_pfn: %lx\n",
nid, start, end);
printk(KERN_DEBUG " Setting physnode_map array to node %d for pfns:\n", nid);
printk(KERN_DEBUG " ");
start = round_down(start, PAGES_PER_SECTION);
end = round_up(end, PAGES_PER_SECTION);
for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION) {
physnode_map[pfn / PAGES_PER_SECTION] = nid;
printk(KERN_CONT "%lx ", pfn);
}
printk(KERN_CONT "\n");
}
#endif
extern unsigned long highend_pfn, highstart_pfn;
void __init initmem_init(void)