x86/e820: Make e820_search_gap() static and remove unused variables

e820_search_gap() is just used locally now and the 'start_addr' and 'end_addr'
parameters are fixed values. Also, 'gapstart' is not checked in this function
anymore.

So make the function static and remove those unused variables.

Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
Acked-by: Yinghai Lu <yinghai@kernel.org>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: akataria@vmware.com
Link: http://lkml.kernel.org/r/1482676551-11411-1-git-send-email-richard.weiyang@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

arch/x86/include/asm/e820.h

@@ -30,8 +30,6 @@ extern u64 e820_remove_range(u64 start, u64 size, unsigned old_type,
 			     int checktype);
 extern void update_e820(void);
 extern void e820_setup_gap(void);
-extern int e820_search_gap(unsigned long *gapstart, unsigned long *gapsize,
-			unsigned long start_addr, unsigned long long end_addr);
 struct setup_data;
 extern void parse_e820_ext(u64 phys_addr, u32 data_len);
 

arch/x86/kernel/e820.c

@@ -580,24 +580,19 @@ static void __init update_e820_saved(void)
 }
 #define MAX_GAP_END 0x100000000ull
 /*
- * Search for a gap in the e820 memory space from start_addr to end_addr.
+ * Search for a gap in the e820 memory space from 0 to MAX_GAP_END.
  */
-__init int e820_search_gap(unsigned long *gapstart, unsigned long *gapsize,
-		unsigned long start_addr, unsigned long long end_addr)
+static int __init e820_search_gap(unsigned long *gapstart,
+		unsigned long *gapsize)
 {
-	unsigned long long last;
+	unsigned long long last = MAX_GAP_END;
 	int i = e820->nr_map;
 	int found = 0;
 
-	last = (end_addr && end_addr < MAX_GAP_END) ? end_addr : MAX_GAP_END;
-
 	while (--i >= 0) {
 		unsigned long long start = e820->map[i].addr;
 		unsigned long long end = start + e820->map[i].size;
 
-		if (end < start_addr)
-			continue;
-
 		/*
 		 * Since "last" is at most 4GB, we know we'll
 		 * fit in 32 bits if this condition is true
@@ -628,9 +623,8 @@ __init void e820_setup_gap(void)
 	unsigned long gapstart, gapsize;
 	int found;
 
-	gapstart = 0x10000000;
 	gapsize = 0x400000;
-	found  = e820_search_gap(&gapstart, &gapsize, 0, MAX_GAP_END);
+	found  = e820_search_gap(&gapstart, &gapsize);
 
 #ifdef CONFIG_X86_64
 	if (!found) {