linux-kernel - [PATCH] mm: fixmap: convert __set_fixmap

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Date:   Fri,  8 Nov 2019 21:41:33 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org
Cc:     Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Arnd Bergmann <arnd@...db.de>, linux-arch@...r.kernel.org
Subject: [PATCH] mm: fixmap: convert __set_fixmap_offset() to an inline function

I just stopped by the ugly variable name, ________addr.
(8 underscores!)

If this is just a matter of casting to (unsigned long), this variable
is unneeded since you can do like this:

({                                                                      \
        __set_fixmap(idx, phys, flags);                                 \
        (unsigned long)(fix_to_virt(idx) + ((phys) & (PAGE_SIZE - 1))); \
})

However, I'd rather like to change it to an inline function since it
is more readable, and the parameter types are clearer.

Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
---

 include/asm-generic/fixmap.h | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/include/asm-generic/fixmap.h b/include/asm-generic/fixmap.h
index 8cc7b09c1bc7..de4c36912529 100644
--- a/include/asm-generic/fixmap.h
+++ b/include/asm-generic/fixmap.h
@@ -70,14 +70,14 @@ static inline unsigned long virt_to_fix(const unsigned long vaddr)
 	__set_fixmap(idx, 0, FIXMAP_PAGE_CLEAR)
 #endif
 
-/* Return a pointer with offset calculated */
-#define __set_fixmap_offset(idx, phys, flags)				\
-({									\
-	unsigned long ________addr;					\
-	__set_fixmap(idx, phys, flags);					\
-	________addr = fix_to_virt(idx) + ((phys) & (PAGE_SIZE - 1));	\
-	________addr;							\
-})
+/* Return a virtual address with offset calculated */
+static inline unsigned long __set_fixmap_offset(enum fixed_addresses idx,
+						phys_addr_t phys,
+						pgprot_t flags)
+{
+	__set_fixmap(idx, phys, flags);
+	return fix_to_virt(idx) + ((phys) & (PAGE_SIZE - 1));
+}
 
 #define set_fixmap_offset(idx, phys) \
 	__set_fixmap_offset(idx, phys, FIXMAP_PAGE_NORMAL)
-- 
2.17.1