linux-kernel - [PATCH 6/4] x86/mm: Simplify probe_page_size

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Date:	Thu, 5 Mar 2015 08:27:03 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	"Luis R. Rodriguez" <mcgrof@...not-panic.com>
Cc:	gregkh@...uxfoundation.org, akpm@...ux-foundation.org,
	tony@...mide.com, tglx@...utronix.de, mingo@...hat.com,
	hpa@...or.com, jgross@...e.com, luto@...capital.net,
	toshi.kani@...com, dave.hansen@...ux.intel.com, JBeulich@...e.com,
	pavel@....cz, qiuxishi@...wei.com, david.vrabel@...rix.com,
	bp@...e.de, vbabka@...e.cz, iamjoonsoo.kim@....com,
	decui@...rosoft.com, linux-kernel@...r.kernel.org, x86@...nel.org,
	julia.lawall@...6.fr, "Luis R. Rodriguez" <mcgrof@...e.com>
Subject: [PATCH 6/4] x86/mm: Simplify probe_page_size_mask()


Now that we've simplified the gbpages config space, move the 
'page_size_mask' initialization into probe_page_size_mask(), right 
next to the PSE and PGE enablement lines.

Cc: Luis R. Rodriguez <mcgrof@...e.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Andy Lutomirski <luto@...capital.net>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Borislav Petkov <bp@...e.de>
Cc: Dave Hansen <dave.hansen@...ux.intel.com>
Cc: David Vrabel <david.vrabel@...rix.com>
Cc: Dexuan Cui <decui@...rosoft.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: JBeulich@...e.com
Cc: Jan Beulich <JBeulich@...e.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@....com>
Cc: Juergen Gross <jgross@...e.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Pavel Machek <pavel@....cz>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Tony Lindgren <tony@...mide.com>
Cc: Toshi Kani <toshi.kani@...com>
Cc: Vlastimil Babka <vbabka@...e.cz>
Cc: Xishi Qiu <qiuxishi@...wei.com>
Cc: julia.lawall@...6.fr
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/mm/init.c | 23 ++++++++++-------------
 1 file changed, 10 insertions(+), 13 deletions(-)

diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
index 8704153f2675..6dc85d51cd98 100644
--- a/arch/x86/mm/init.c
+++ b/arch/x86/mm/init.c
@@ -131,29 +131,18 @@ void  __init early_alloc_pgt_buf(void)
 
 int after_bootmem;
 
-static int page_size_mask;
-
 early_param_on_off("gbpages", "nogbpages", direct_gbpages, CONFIG_X86_DIRECT_GBPAGES);
 
-static void __init init_gbpages(void)
-{
-	if (direct_gbpages && cpu_has_gbpages) {
-		printk(KERN_INFO "Using GB pages for direct mapping\n");
-		page_size_mask |= 1 << PG_LEVEL_1G;
-	} else
-		direct_gbpages = 0;
-}
-
 struct map_range {
 	unsigned long start;
 	unsigned long end;
 	unsigned page_size_mask;
 };
 
+static int page_size_mask;
+
 static void __init probe_page_size_mask(void)
 {
-	init_gbpages();
-
 #if !defined(CONFIG_DEBUG_PAGEALLOC) && !defined(CONFIG_KMEMCHECK)
 	/*
 	 * For CONFIG_DEBUG_PAGEALLOC, identity mapping will use small pages.
@@ -173,6 +162,14 @@ static void __init probe_page_size_mask(void)
 		cr4_set_bits_and_update_boot(X86_CR4_PGE);
 		__supported_pte_mask |= _PAGE_GLOBAL;
 	}
+
+	/* Enable 1 GB linear kernel mappings if available: */
+	if (direct_gbpages && cpu_has_gbpages) {
+		printk(KERN_INFO "Using GB pages for direct mapping\n");
+		page_size_mask |= 1 << PG_LEVEL_1G;
+	} else {
+		direct_gbpages = 0;
+	}
 }
 
 #ifdef CONFIG_X86_32
--
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