linux-kernel - [PATCH] x86/setup: refactor initrd reservation

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Date:	Fri,  5 Feb 2016 23:38:20 +0600
From:	Alexander Kuleshov <kuleshovmail@...il.com>
To:	Ingo Molnar <mingo@...hat.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	"H . Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	Borislav Petkov <bp@...e.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Andy Lutomirski <luto@...nel.org>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	linux-kernel@...r.kernel.org,
	Alexander Kuleshov <kuleshovmail@...il.com>
Subject: [PATCH] x86/setup: refactor initrd reservation

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.

Signed-off-by: Alexander Kuleshov <kuleshovmail@...il.com>
---
 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..f6f38b0 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(int 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(int 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(1);
 
 	/*
 	 * 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(0);
 
 #if defined(CONFIG_ACPI) && defined(CONFIG_BLK_DEV_INITRD)
 	acpi_initrd_override((void *)initrd_start, initrd_end - initrd_start);
-- 
2.7.0.25.gfc10eb5