[tip:x86/mm] x86: Drop 4 unnecessary calls to __pa_symbol

[tip-bot for Alexander Duyck]

Commit-ID:  05a476b6e3795f205806662bf09ab95774266292
Gitweb:     http://git.kernel.org/tip/05a476b6e3795f205806662bf09ab95774266292
Author:     Alexander Duyck <alexander.h.duyck@xxxxxxxxx>
AuthorDate: Fri, 16 Nov 2012 13:56:35 -0800
Committer:  H. Peter Anvin <hpa@xxxxxxxxxxxxxxx>
CommitDate: Fri, 16 Nov 2012 16:42:09 -0800

x86: Drop 4 unnecessary calls to __pa_symbol

While debugging the __pa_symbol inline patch I found that there were a couple
spots where __pa_symbol was used as follows:
__pa_symbol(x) - __pa_symbol(y)

The compiler had reduced them to:
x - y

Since we also support a debug case where __pa_symbol is a function call it
would probably be useful to just change the two cases I found so that they are
always just treated as "x - y".  As such I am casting the values to
phys_addr_t and then doing simple subtraction so that the correct type and
value is returned.

Signed-off-by: Alexander Duyck <alexander.h.duyck@xxxxxxxxx>
Link: http://lkml.kernel.org/r/20121116215552.8521.68085.stgit@xxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: H. Peter Anvin <hpa@xxxxxxxxxxxxxxx>
---
 arch/x86/kernel/head32.c | 4 ++--
 arch/x86/kernel/head64.c | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kernel/head32.c b/arch/x86/kernel/head32.c
index c18f59d..f15db0c 100644
--- a/arch/x86/kernel/head32.c
+++ b/arch/x86/kernel/head32.c
@@ -30,8 +30,8 @@ static void __init i386_default_early_setup(void)
 
 void __init i386_start_kernel(void)
 {
-	memblock_reserve(__pa_symbol(&_text),
-			 __pa_symbol(&__bss_stop) - __pa_symbol(&_text));
+	memblock_reserve(__pa_symbol(_text),
+			 (phys_addr_t)__bss_stop - (phys_addr_t)_text);
 
 #ifdef CONFIG_BLK_DEV_INITRD
 	/* Reserve INITRD */
diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c
index 037df57..42f5df1 100644
--- a/arch/x86/kernel/head64.c
+++ b/arch/x86/kernel/head64.c
@@ -97,8 +97,8 @@ void __init x86_64_start_reservations(char *real_mode_data)
 {
 	copy_bootdata(__va(real_mode_data));
 
-	memblock_reserve(__pa_symbol(&_text),
-			 __pa_symbol(&__bss_stop) - __pa_symbol(&_text));
+	memblock_reserve(__pa_symbol(_text),
+			 (phys_addr_t)__bss_stop - (phys_addr_t)_text);
 
 #ifdef CONFIG_BLK_DEV_INITRD
 	/* Reserve INITRD */
--
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