alpha: remove DISCONTIGMEM and NUMA

Patch series "Remove DISCONTIGMEM memory model", v3.

SPARSEMEM memory model was supposed to entirely replace DISCONTIGMEM a
(long) while ago.  The last architectures that used DISCONTIGMEM were
updated to use other memory models in v5.11 and it is about the time to
entirely remove DISCONTIGMEM from the kernel.

This set removes DISCONTIGMEM from alpha, arc and m68k, simplifies memory
model selection in mm/Kconfig and replaces usage of redundant
CONFIG_NEED_MULTIPLE_NODES and CONFIG_FLAT_NODE_MEM_MAP with CONFIG_NUMA
and CONFIG_FLATMEM respectively.

I've also removed NUMA support on alpha that was BROKEN for more than 15
years.

There were also minor updates all over arch/ to remove mentions of
DISCONTIGMEM in comments and #ifdefs.

This patch (of 9):

NUMA is marked broken on alpha for more than 15 years and DISCONTIGMEM was
replaced with SPARSEMEM in v5.11.

Remove both NUMA and DISCONTIGMEM support from alpha.

Link: https://lkml.kernel.org/r/20210608091316.3622-1-rppt@kernel.org
Link: https://lkml.kernel.org/r/20210608091316.3622-2-rppt@kernel.org
Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: David Hildenbrand <david@redhat.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Vineet Gupta <vgupta@synopsys.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

4 files changed, 0 insertions, 149 deletions

diff --git a/arch/alpha/include/asm/machvec.h b/arch/alpha/include/asm/machvec.h
index a4e96e2bec74..e49fabce7b33 100644
--- a/arch/alpha/include/asm/machvec.h
+++ b/arch/alpha/include/asm/machvec.h
@@ -99,12 +99,6 @@ struct alpha_machine_vector
 
 	const char *vector_name;
 
-	/* NUMA information */
-	int (*pa_to_nid)(unsigned long);
-	int (*cpuid_to_nid)(int);
-	unsigned long (*node_mem_start)(int);
-	unsigned long (*node_mem_size)(int);
-
 	/* System specific parameters.  */
 	union {
 	    struct {
diff --git a/arch/alpha/include/asm/mmzone.h b/arch/alpha/include/asm/mmzone.h
deleted file mode 100644
index 86644604d977..000000000000
--- a/arch/alpha/include/asm/mmzone.h
+++ /dev/null
@@ -1,100 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-/*
- * Written by Kanoj Sarcar (kanoj@sgi.com) Aug 99
- * Adapted for the alpha wildfire architecture Jan 2001.
- */
-#ifndef _ASM_MMZONE_H_
-#define _ASM_MMZONE_H_
-
-#ifdef CONFIG_DISCONTIGMEM
-
-#include <asm/smp.h>
-
-/*
- * Following are macros that are specific to this numa platform.
- */
-
-extern pg_data_t node_data[];
-
-#define alpha_pa_to_nid(pa)		\
-        (alpha_mv.pa_to_nid 		\
-	 ? alpha_mv.pa_to_nid(pa)	\
-	 : (0))
-#define node_mem_start(nid)		\
-        (alpha_mv.node_mem_start 	\
-	 ? alpha_mv.node_mem_start(nid) \
-	 : (0UL))
-#define node_mem_size(nid)		\
-        (alpha_mv.node_mem_size 	\
-	 ? alpha_mv.node_mem_size(nid) 	\
-	 : ((nid) ? (0UL) : (~0UL)))
-
-#define pa_to_nid(pa)		alpha_pa_to_nid(pa)
-#define NODE_DATA(nid)		(&node_data[(nid)])
-
-#define node_localnr(pfn, nid)	((pfn) - NODE_DATA(nid)->node_start_pfn)
-
-#if 1
-#define PLAT_NODE_DATA_LOCALNR(p, n)	\
-	(((p) >> PAGE_SHIFT) - PLAT_NODE_DATA(n)->gendata.node_start_pfn)
-#else
-static inline unsigned long
-PLAT_NODE_DATA_LOCALNR(unsigned long p, int n)
-{
-	unsigned long temp;
-	temp = p >> PAGE_SHIFT;
-	return temp - PLAT_NODE_DATA(n)->gendata.node_start_pfn;
-}
-#endif
-
-/*
- * Following are macros that each numa implementation must define.
- */
-
-/*
- * Given a kernel address, find the home node of the underlying memory.
- */
-#define kvaddr_to_nid(kaddr)	pa_to_nid(__pa(kaddr))
-
-/*
- * Given a kaddr, LOCAL_BASE_ADDR finds the owning node of the memory
- * and returns the kaddr corresponding to first physical page in the
- * node's mem_map.
- */
-#define LOCAL_BASE_ADDR(kaddr)						  \
-    ((unsigned long)__va(NODE_DATA(kvaddr_to_nid(kaddr))->node_start_pfn  \
-			 << PAGE_SHIFT))
-
-/* XXX: FIXME -- nyc */
-#define kern_addr_valid(kaddr)	(0)
-
-#define mk_pte(page, pgprot)						     \
-({								 	     \
-	pte_t pte;                                                           \
-	unsigned long pfn;                                                   \
-									     \
-	pfn = page_to_pfn(page) << 32; \
-	pte_val(pte) = pfn | pgprot_val(pgprot);			     \
-									     \
-	pte;								     \
-})
-
-#define pte_page(x)							\
-({									\
-       	unsigned long kvirt;						\
-	struct page * __xx;						\
-									\
-	kvirt = (unsigned long)__va(pte_val(x) >> (32-PAGE_SHIFT));	\
-	__xx = virt_to_page(kvirt);					\
-									\
-	__xx;                                                           \
-})
-
-#define pfn_to_nid(pfn)		pa_to_nid(((u64)(pfn) << PAGE_SHIFT))
-#define pfn_valid(pfn)							\
-	(((pfn) - node_start_pfn(pfn_to_nid(pfn))) <			\
-	 node_spanned_pages(pfn_to_nid(pfn)))					\
-
-#endif /* CONFIG_DISCONTIGMEM */
-
-#endif /* _ASM_MMZONE_H_ */
diff --git a/arch/alpha/include/asm/pgtable.h b/arch/alpha/include/asm/pgtable.h
index 8d856c62e22a..e1757b7cfe3d 100644
--- a/arch/alpha/include/asm/pgtable.h
+++ b/arch/alpha/include/asm/pgtable.h
@@ -206,7 +206,6 @@ extern unsigned long __zero_page(void);
 #define page_to_pa(page)	(page_to_pfn(page) << PAGE_SHIFT)
 #define pte_pfn(pte)	(pte_val(pte) >> 32)
 
-#ifndef CONFIG_DISCONTIGMEM
 #define pte_page(pte)	pfn_to_page(pte_pfn(pte))
 #define mk_pte(page, pgprot)						\
 ({									\
@@ -215,7 +214,6 @@ extern unsigned long __zero_page(void);
 	pte_val(pte) = (page_to_pfn(page) << 32) | pgprot_val(pgprot);	\
 	pte;								\
 })
-#endif
 
 extern inline pte_t pfn_pte(unsigned long physpfn, pgprot_t pgprot)
 { pte_t pte; pte_val(pte) = (PHYS_TWIDDLE(physpfn) << 32) | pgprot_val(pgprot); return pte; }
@@ -330,9 +328,7 @@ extern inline pte_t mk_swap_pte(unsigned long type, unsigned long offset)
 #define __pte_to_swp_entry(pte)	((swp_entry_t) { pte_val(pte) })
 #define __swp_entry_to_pte(x)	((pte_t) { (x).val })
 
-#ifndef CONFIG_DISCONTIGMEM
 #define kern_addr_valid(addr)	(1)
-#endif
 
 #define pte_ERROR(e) \
 	printk("%s:%d: bad pte %016lx.\n", __FILE__, __LINE__, pte_val(e))
diff --git a/arch/alpha/include/asm/topology.h b/arch/alpha/include/asm/topology.h
index 5a77a40567fa..7d393036aa8f 100644
--- a/arch/alpha/include/asm/topology.h
+++ b/arch/alpha/include/asm/topology.h
@@ -7,45 +7,6 @@
 #include <linux/numa.h>
 #include <asm/machvec.h>
 
-#ifdef CONFIG_NUMA
-static inline int cpu_to_node(int cpu)
-{
-	int node;
-	
-	if (!alpha_mv.cpuid_to_nid)
-		return 0;
-
-	node = alpha_mv.cpuid_to_nid(cpu);
-
-#ifdef DEBUG_NUMA
-	BUG_ON(node < 0);
-#endif
-
-	return node;
-}
-
-extern struct cpumask node_to_cpumask_map[];
-/* FIXME: This is dumb, recalculating every time.  But simple. */
-static const struct cpumask *cpumask_of_node(int node)
-{
-	int cpu;
-
-	if (node == NUMA_NO_NODE)
-		return cpu_all_mask;
-
-	cpumask_clear(&node_to_cpumask_map[node]);
-
-	for_each_online_cpu(cpu) {
-		if (cpu_to_node(cpu) == node)
-			cpumask_set_cpu(cpu, node_to_cpumask_map[node]);
-	}
-
-	return &node_to_cpumask_map[node];
-}
-
-#define cpumask_of_pcibus(bus)	(cpu_online_mask)
-
-#endif /* !CONFIG_NUMA */
 # include <asm-generic/topology.h>
 
 #endif /* _ASM_ALPHA_TOPOLOGY_H */