[PATCH 12/13] m68k/mm: enable use of generic memory_model.h for !DISCONTIGMEM

From: Mike Rapoport <rppt@kernel.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Alexey Dobriyan <adobriyan@gmail.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Geert Uytterhoeven <geert@linux-m68k.org>,
	Greg Ungerer <gerg@linux-m68k.org>,
	John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>,
	Jonathan Corbet <corbet@lwn.net>,
	Matt Turner <mattst88@gmail.com>, Meelis Roos <mroos@linux.ee>,
	Michael Schmitz <schmitzmic@gmail.com>,
	Mike Rapoport <rppt@kernel.org>,
	Mike Rapoport <rppt@linux.ibm.com>,
	Russell King <linux@armlinux.org.uk>,
	Tony Luck <tony.luck@intel.com>,
	Vineet Gupta <vgupta@synopsys.com>, Will Deacon <will@kernel.org>,
	linux-alpha@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org,
	linux-fsdevel@vger.kernel.org, linux-ia64@vger.kernel.org,
	linux-kernel@vger.kernel.org, linux-m68k@lists.linux-m68k.org,
	linux-mm@kvack.org, linux-snps-arc@lists.infradead.org
Subject: [PATCH 12/13] m68k/mm: enable use of generic memory_model.h for !DISCONTIGMEM
Date: Tue, 27 Oct 2020 13:29:54 +0200	[thread overview]
Message-ID: <20201027112955.14157-13-rppt@kernel.org> (raw)
In-Reply-To: <20201027112955.14157-1-rppt@kernel.org>

From: Mike Rapoport <rppt@linux.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@linux.ibm.com>
---
 arch/m68k/include/asm/page.h        | 2 ++
 arch/m68k/include/asm/page_mm.h     | 5 +++++
 arch/m68k/include/asm/virtconvert.h | 2 +-
 arch/m68k/mm/init.c                 | 6 +++---
 4 files changed, 11 insertions(+), 4 deletions(-)

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 dfe43083b579..751bb6f4aaf6 100644
--- a/arch/m68k/include/asm/virtconvert.h
+++ b/arch/m68k/include/asm/virtconvert.h
@@ -31,7 +31,7 @@ static inline void *phys_to_virt(unsigned long address)
 /* Permanent address of a page. */
 #if defined(CONFIG_MMU) && defined(CONFIG_SINGLE_MEMORY_CHUNK)
 #define page_to_phys(page) \
-	__pa(PAGE_OFFSET + (((page) - pg_data_map[0].node_mem_map) << PAGE_SHIFT))
+	__pa(PAGE_OFFSET + (((page) - mem_map) << PAGE_SHIFT))
 #else
 #define page_to_phys(page)	(page_to_pfn(page) << PAGE_SHIFT)
 #endif
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

