linux-kernel - [PATCH] mm: swap the definition of CONFIG_SPARSEMEM_VMEMMAP and CONFIG

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Date:   Fri,  4 Nov 2022 11:28:08 +0800
From:   "zhijun.han" <hanzj.it@...il.com>
To:     arnd@...db.de
Cc:     linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
        "zhijun.han" <hanzj.it@...il.com>
Subject: [PATCH] mm: swap the definition of CONFIG_SPARSEMEM_VMEMMAP and CONFIG_SPARSEMEM

CONFIG_SPARSEMEM_VMEMMAP depends on CONFIG_SPARSEMEM
When CONFIG_SPARSEMEM_VMEMMAP is enabled,
CONFIG_SPARSEMEM will be enabled too.
Causes __pfn_to_page and __page_to_pfn to be overwritten

Signed-off-by: zhijun.han <hanzj.it@...il.com>
---
 include/asm-generic/memory_model.h | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/include/asm-generic/memory_model.h b/include/asm-generic/memory_model.h
index a2c8ed60233a..e06851e0b39e 100644
--- a/include/asm-generic/memory_model.h
+++ b/include/asm-generic/memory_model.h
@@ -19,12 +19,6 @@
 #define __page_to_pfn(page)	((unsigned long)((page) - mem_map) + \
 				 ARCH_PFN_OFFSET)
 
-#elif defined(CONFIG_SPARSEMEM_VMEMMAP)
-
-/* memmap is virtually contiguous.  */
-#define __pfn_to_page(pfn)	(vmemmap + (pfn))
-#define __page_to_pfn(page)	(unsigned long)((page) - vmemmap)
-
 #elif defined(CONFIG_SPARSEMEM)
 /*
  * Note: section's mem_map is encoded to reflect its start_pfn.
@@ -41,6 +35,12 @@
 	struct mem_section *__sec = __pfn_to_section(__pfn);	\
 	__section_mem_map_addr(__sec) + __pfn;		\
 })
+
+#elif defined(CONFIG_SPARSEMEM_VMEMMAP)
+
+/* memmap is virtually contiguous.  */
+#define __pfn_to_page(pfn)	(vmemmap + (pfn))
+#define __page_to_pfn(page)	((unsigned long)((page) - vmemmap))
 #endif /* CONFIG_FLATMEM/SPARSEMEM */
 
 /*
-- 
2.37.0 (Apple Git-136)