[PATCH v2] x86/setup: Merge {early_,}reserve_initrd() to one function

[Alexander Kuleshov]

The check and definitions related to ramdisk are similar in the
early_reserve_initrd() and reserve_initrd(). So we can get rid of
early_reserve_initrd() and and use late or early algorithm for
initrd reservation depends on reserve_initrd() parameter value.

Save 396 bytes of code:

   text            data      bss      dec     hex filename
   9281618      5010736 15474688 29767042 1c63582 vmlinux.orig

   text            data      bss      dec     hex filename
   9281222      5010672 15474688 29766582 1c633b6 vmlinux.new

Signed-off-by: Alexander Kuleshov <kuleshovm...@gmail.com>
---
Changelog:

v2: parameter of reserve_initrd() - int -> bool.
    commit message updated.

 arch/x86/kernel/setup.c | 29 +++++++++--------------------
 1 file changed, 9 insertions(+), 20 deletions(-)

diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index d3d80e6..0a2fa55 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -349,20 +349,7 @@ static void __init relocate_initrd(void)
                relocated_ramdisk, relocated_ramdisk + ramdisk_size - 1);
 }
 
-static void __init early_reserve_initrd(void)
-{
-       /* Assume only end is not page aligned */
-       u64 ramdisk_image = get_ramdisk_image();
-       u64 ramdisk_size  = get_ramdisk_size();
-       u64 ramdisk_end   = PAGE_ALIGN(ramdisk_image + ramdisk_size);
-
-       if (!boot_params.hdr.type_of_loader ||
-           !ramdisk_image || !ramdisk_size)
-               return;         /* No initrd provided by bootloader */
-
-       memblock_reserve(ramdisk_image, ramdisk_end - ramdisk_image);
-}
-static void __init reserve_initrd(void)
+static void __init reserve_initrd(bool early)
 {
        /* Assume only end is not page aligned */
        u64 ramdisk_image = get_ramdisk_image();
@@ -374,6 +361,11 @@ static void __init reserve_initrd(void)
            !ramdisk_image || !ramdisk_size)
                return;         /* No initrd provided by bootloader */
 
+       if (early) {
+               memblock_reserve(ramdisk_image, ramdisk_end - ramdisk_image);
+               return;
+       }
+
        initrd_start = 0;
 
        mapped_size = memblock_mem_size(max_pfn_mapped);
@@ -398,10 +390,7 @@ static void __init reserve_initrd(void)
        memblock_free(ramdisk_image, ramdisk_end - ramdisk_image);
 }
 #else
-static void __init early_reserve_initrd(void)
-{
-}
-static void __init reserve_initrd(void)
+static void __init reserve_initrd(bool early)
 {
 }
 #endif /* CONFIG_BLK_DEV_INITRD */
@@ -850,7 +839,7 @@ void __init setup_arch(char **cmdline_p)
        memblock_reserve(__pa_symbol(_text),
                         (unsigned long)__bss_stop - (unsigned long)_text);
 
-       early_reserve_initrd();
+       reserve_initrd(true);
 
        /*
         * At this point everything still needed from the boot loader
@@ -1135,7 +1124,7 @@ void __init setup_arch(char **cmdline_p)
        /* Allocate bigger log buffer */
        setup_log_buf(1);
 
-       reserve_initrd();
+       reserve_initrd(false);
 
 #if defined(CONFIG_ACPI) && defined(CONFIG_BLK_DEV_INITRD)
        acpi_initrd_override((void *)initrd_start, initrd_end - initrd_start);
-- 
2.7.0.25.gfc10eb5