x86/boot/e820: Rename e820_setup_gap() to e820__setup_pci_gap()

The e820_setup_gap() function name is unnecessarily silent about what
kind of gap it sets up. Make it clear that it's about the PCI gap.

No change in functionality.

Cc: Alex Thorlton <athorlton@sgi.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Huang, Ying <ying.huang@intel.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Juergen Gross <jgross@suse.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul Jackson <pj@sgi.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rafael J. Wysocki <rjw@sisk.pl>
Cc: Tejun Heo <tj@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Wei Yang <richard.weiyang@gmail.com>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

arch/x86/include/asm/e820/api.h

@@ -16,7 +16,7 @@ extern int  e820__update_table(struct e820_entry *biosmap, int max_nr_map, u32 *
 extern u64  e820_update_range(u64 start, u64 size, unsigned old_type, unsigned new_type);
 extern u64  e820_remove_range(u64 start, u64 size, unsigned old_type, int checktype);
 extern void e820__update_table_print(void);
-extern void e820_setup_gap(void);
+extern void e820__setup_pci_gap(void);
 extern void e820__memory_setup_extended(u64 phys_addr, u32 data_len);
 extern unsigned long e820_end_of_ram_pfn(void);
 extern unsigned long e820_end_of_low_ram_pfn(void);

arch/x86/kernel/e820.c

@@ -602,7 +602,7 @@ static int __init e820_search_gap(unsigned long *gapstart, unsigned long *gapsiz
  *
  * Hopefully the BIOS let enough space left.
  */
-__init void e820_setup_gap(void)
+__init void e820__setup_pci_gap(void)
 {
 	unsigned long gapstart, gapsize;
 	int found;

arch/x86/kernel/setup.c

@@ -1241,7 +1241,7 @@ void __init setup_arch(char **cmdline_p)
 
 	x86_init.resources.reserve_resources();
 
-	e820_setup_gap();
+	e820__setup_pci_gap();
 
 #ifdef CONFIG_VT
 #if defined(CONFIG_VGA_CONSOLE)