m68k: remove support for DISCONTIGMEM

DISCONTIGMEM was replaced by FLATMEM with freeing of the unused memory map
in v5.11.

Remove the support for DISCONTIGMEM entirely.

Link: https://lkml.kernel.org/r/20210608091316.3622-5-rppt@kernel.org
Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
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>

arch/m68k/Kconfig.cpu

@@ -408,10 +408,6 @@ config SINGLE_MEMORY_CHUNK
 	  order" to save memory that could be wasted for unused memory map.
 	  Say N if not sure.
 
-config ARCH_DISCONTIGMEM_ENABLE
-	depends on BROKEN
-	def_bool MMU && !SINGLE_MEMORY_CHUNK
-
 config FORCE_MAX_ZONEORDER
 	int "Maximum zone order" if ADVANCED
 	depends on !SINGLE_MEMORY_CHUNK
@@ -451,11 +447,6 @@ config M68K_L2_CACHE
 	depends on MAC
 	default y
 
-config NODES_SHIFT
-	int
-	default "3"
-	depends on DISCONTIGMEM
-
 config CPU_HAS_NO_BITFIELDS
 	bool
 
@@ -553,4 +544,3 @@ config CACHE_COPYBACK
 	  The ColdFire CPU cache is set into Copy-back mode.
 endchoice
 endif
-

arch/m68k/include/asm/page.h

@@ -62,7 +62,7 @@ extern unsigned long _ramend;
 #include <asm/page_no.h>
 #endif
 
-#if !defined(CONFIG_MMU) || defined(CONFIG_DISCONTIGMEM)
+#ifndef CONFIG_MMU
 #define __phys_to_pfn(paddr)	((unsigned long)((paddr) >> PAGE_SHIFT))
 #define __pfn_to_phys(pfn)	PFN_PHYS(pfn)
 #endif

arch/m68k/include/asm/page_mm.h

@@ -126,50 +126,15 @@ static inline void *__va(unsigned long x)
 
 extern int m68k_virt_to_node_shift;
 
-#ifndef CONFIG_DISCONTIGMEM
-#define __virt_to_node(addr)	(&pg_data_map[0])
-#else
-extern struct pglist_data *pg_data_table[];
-
-static inline __attribute_const__ int __virt_to_node_shift(void)
-{
-	int shift;
-
-	asm (
-		"1:	moveq	#0,%0\n"
-		m68k_fixup(%c1, 1b)
-		: "=d" (shift)
-		: "i" (m68k_fixup_vnode_shift));
-	return shift;
-}
-
-#define __virt_to_node(addr)	(pg_data_table[(unsigned long)(addr) >> __virt_to_node_shift()])
-#endif
-
 #define virt_to_page(addr) ({						\
 	pfn_to_page(virt_to_pfn(addr));					\
 })
 #define page_to_virt(page) ({						\
 	pfn_to_virt(page_to_pfn(page));					\
 })
 
-#ifdef CONFIG_DISCONTIGMEM
-#define pfn_to_page(pfn) ({						\
-	unsigned long __pfn = (pfn);					\
-	struct pglist_data *pgdat;					\
-	pgdat = __virt_to_node((unsigned long)pfn_to_virt(__pfn));	\
-	pgdat->node_mem_map + (__pfn - pgdat->node_start_pfn);		\
-})
-#define page_to_pfn(_page) ({						\
-	const struct page *__p = (_page);				\
-	struct pglist_data *pgdat;					\
-	pgdat = &pg_data_map[page_to_nid(__p)];				\
-	((__p) - pgdat->node_mem_map) + pgdat->node_start_pfn;		\
-})
-#else
 #define ARCH_PFN_OFFSET (m68k_memory[0].addr >> PAGE_SHIFT)
 #include <asm-generic/memory_model.h>
-#endif
 
 #define virt_addr_valid(kaddr)	((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory)
 #define pfn_valid(pfn)		virt_addr_valid(pfn_to_virt(pfn))

arch/m68k/mm/init.c

@@ -44,28 +44,8 @@ EXPORT_SYMBOL(empty_zero_page);
 
 int m68k_virt_to_node_shift;
 
-#ifdef CONFIG_DISCONTIGMEM
-pg_data_t pg_data_map[MAX_NUMNODES];
-EXPORT_SYMBOL(pg_data_map);
-
-pg_data_t *pg_data_table[65];
-EXPORT_SYMBOL(pg_data_table);
-#endif
-
 void __init m68k_setup_node(int node)
 {
-#ifdef CONFIG_DISCONTIGMEM
-	struct m68k_mem_info *info = m68k_memory + node;
-	int i, end;
-
-	i = (unsigned long)phys_to_virt(info->addr) >> __virt_to_node_shift();
-	end = (unsigned long)phys_to_virt(info->addr + info->size - 1) >> __virt_to_node_shift();
-	for (; i <= end; i++) {
-		if (pg_data_table[i])
-			pr_warn("overlap at %u for chunk %u\n", i, node);
-		pg_data_table[i] = pg_data_map + node;
-	}
-#endif
 	node_set_online(node);
 }