linux-kernel - [PATCH 4.9 105/130] arm64: mm: avoid name clash in __page_to

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Date:   Tue, 24 Jan 2017 08:55:45 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Mark Rutland <mark.rutland@....com>,
        Volodymyr Babchuk <Volodymyr_Babchuk@...m.com>,
        Oleksandr Andrushchenko <Oleksandr_Andrushchenko@...m.com>,
        Catalin Marinas <catalin.marinas@....com>
Subject: [PATCH 4.9 105/130] arm64: mm: avoid name clash in __page_to_voff()

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Oleksandr Andrushchenko <Oleksandr_Andrushchenko@...m.com>

commit 1c8a946bf3754a59cba1fc373949a8114bfe5aaa upstream.

The arm64 __page_to_voff() macro takes a parameter called 'page', and
also refers to 'struct page'. Thus, if the value passed in is not
called 'page', we'll refer to the wrong struct name (which might not
exist).

Fixes: 3fa72fe9c614 ("arm64: mm: fix __page_to_voff definition")
Acked-by: Mark Rutland <mark.rutland@....com>
Suggested-by: Volodymyr Babchuk <Volodymyr_Babchuk@...m.com>
Signed-off-by: Oleksandr Andrushchenko <Oleksandr_Andrushchenko@...m.com>
Signed-off-by: Catalin Marinas <catalin.marinas@....com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/arm64/include/asm/memory.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/arm64/include/asm/memory.h
+++ b/arch/arm64/include/asm/memory.h
@@ -217,7 +217,7 @@ static inline void *phys_to_virt(phys_ad
 #define _virt_addr_valid(kaddr)	pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 #else
 #define __virt_to_pgoff(kaddr)	(((u64)(kaddr) & ~PAGE_OFFSET) / PAGE_SIZE * sizeof(struct page))
-#define __page_to_voff(page)	(((u64)(page) & ~VMEMMAP_START) * PAGE_SIZE / sizeof(struct page))
+#define __page_to_voff(kaddr)	(((u64)(kaddr) & ~VMEMMAP_START) * PAGE_SIZE / sizeof(struct page))
 
 #define page_to_virt(page)	((void *)((__page_to_voff(page)) | PAGE_OFFSET))
 #define virt_to_page(vaddr)	((struct page *)((__virt_to_pgoff(vaddr)) | VMEMMAP_START))