linux-kernel - [PATCH v2 12/13] m68k/mm: enable use of generic memory

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Message-Id: <20201101170454.9567-13-rppt@kernel.org>
Date:   Sun,  1 Nov 2020 19:04:53 +0200
From:   Mike Rapoport <rppt@...nel.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Alexey Dobriyan <adobriyan@...il.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Greg Ungerer <gerg@...ux-m68k.org>,
        John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
        Jonathan Corbet <corbet@....net>,
        Matt Turner <mattst88@...il.com>, Meelis Roos <mroos@...ux.ee>,
        Michael Schmitz <schmitzmic@...il.com>,
        Mike Rapoport <rppt@...nel.org>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Russell King <linux@...linux.org.uk>,
        Tony Luck <tony.luck@...el.com>,
        Vineet Gupta <vgupta@...opsys.com>,
        Will Deacon <will@...nel.org>, linux-alpha@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-doc@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-ia64@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-m68k@...ts.linux-m68k.org,
        linux-mm@...ck.org, linux-snps-arc@...ts.infradead.org
Subject: [PATCH v2 12/13] m68k/mm: enable use of generic memory_model.h for !DISCONTIGMEM

From: Mike Rapoport <rppt@...ux.ibm.com>

The pg_data_map and pg_data_table arrays as well as page_to_pfn() and
pfn_to_page() are required only for DISCONTIGMEM. Other memory models can
use the generic definitions in asm-generic/memory_model.h.

Signed-off-by: Mike Rapoport <rppt@...ux.ibm.com>
---
 arch/m68k/Kconfig.cpu               | 1 -
 arch/m68k/include/asm/page.h        | 2 ++
 arch/m68k/include/asm/page_mm.h     | 5 +++++
 arch/m68k/include/asm/virtconvert.h | 5 -----
 arch/m68k/mm/init.c                 | 6 +++---
 5 files changed, 10 insertions(+), 9 deletions(-)

diff --git a/arch/m68k/Kconfig.cpu b/arch/m68k/Kconfig.cpu
index e8ad721e52f6..b8884af365ae 100644
--- a/arch/m68k/Kconfig.cpu
+++ b/arch/m68k/Kconfig.cpu
@@ -374,7 +374,6 @@ config SINGLE_MEMORY_CHUNK
 	bool "Use one physical chunk of memory only" if ADVANCED && !SUN3
 	depends on MMU
 	default y if SUN3 || MMU_COLDFIRE
-	select NEED_MULTIPLE_NODES
 	help
 	  Ignore all but the first contiguous chunk of physical memory for VM
 	  purposes.  This will save a few bytes kernel size and may speed up
diff --git a/arch/m68k/include/asm/page.h b/arch/m68k/include/asm/page.h
index 2614a1206f2f..6116d7094292 100644
--- a/arch/m68k/include/asm/page.h
+++ b/arch/m68k/include/asm/page.h
@@ -62,8 +62,10 @@ extern unsigned long _ramend;
 #include <asm/page_no.h>
 #endif
 
+#ifdef CONFIG_DISCONTIGMEM
 #define __phys_to_pfn(paddr)	((unsigned long)((paddr) >> PAGE_SHIFT))
 #define __pfn_to_phys(pfn)	PFN_PHYS(pfn)
+#endif
 
 #include <asm-generic/getorder.h>
 
diff --git a/arch/m68k/include/asm/page_mm.h b/arch/m68k/include/asm/page_mm.h
index 0e794051d3bb..7f5912af2a52 100644
--- a/arch/m68k/include/asm/page_mm.h
+++ b/arch/m68k/include/asm/page_mm.h
@@ -153,6 +153,7 @@ static inline __attribute_const__ int __virt_to_node_shift(void)
 	pfn_to_virt(page_to_pfn(page));					\
 })
 
+#ifdef CONFIG_DISCONTIGMEM
 #define pfn_to_page(pfn) ({						\
 	unsigned long __pfn = (pfn);					\
 	struct pglist_data *pgdat;					\
@@ -165,6 +166,10 @@ static inline __attribute_const__ int __virt_to_node_shift(void)
 	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)
+#include <asm-generic/memory_model.h>
+#endif
 
 #define virt_addr_valid(kaddr)	((void *)(kaddr) >= (void *)PAGE_OFFSET && (void *)(kaddr) < high_memory)
 #define pfn_valid(pfn)		virt_addr_valid(pfn_to_virt(pfn))
diff --git a/arch/m68k/include/asm/virtconvert.h b/arch/m68k/include/asm/virtconvert.h
index eb9eb5cb23a6..ca91b32dc6ef 100644
--- a/arch/m68k/include/asm/virtconvert.h
+++ b/arch/m68k/include/asm/virtconvert.h
@@ -29,12 +29,7 @@ static inline void *phys_to_virt(unsigned long address)
 }
 
 /* Permanent address of a page. */
-#if defined(CONFIG_MMU) && !defined(CONFIG_DISCONTIGMEM)
-#define page_to_phys(page) \
-	__pa(PAGE_OFFSET + (((page) - pg_data_map[0].node_mem_map) << PAGE_SHIFT))
-#else
 #define page_to_phys(page)	(page_to_pfn(page) << PAGE_SHIFT)
-#endif
 
 /*
  * IO bus memory addresses are 1:1 with the physical address,
diff --git a/arch/m68k/mm/init.c b/arch/m68k/mm/init.c
index 4b46ceace3d3..14c1e541451c 100644
--- a/arch/m68k/mm/init.c
+++ b/arch/m68k/mm/init.c
@@ -42,12 +42,12 @@ EXPORT_SYMBOL(empty_zero_page);
 
 #ifdef CONFIG_MMU
 
-pg_data_t pg_data_map[MAX_NUMNODES];
-EXPORT_SYMBOL(pg_data_map);
-
 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
-- 
2.28.0