[PATCH 6/4] x86/mm: Simplify probe_page_size_mask()

Ingo Molnar
2015-03-05T07:27:10Z

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@suse.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Borislav Petkov <bp@suse.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: David Vrabel <david.vrabel@citrix.com>
Cc: Dexuan Cui <decui@microsoft.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: JBeulich@suse.com
Cc: Jan Beulich <JBeulich@suse.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Juergen Gross <jgross@suse.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tony Lindgren <tony@atomide.com>
Cc: Toshi Kani <toshi.kani@hp.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Xishi Qiu <qiuxishi@huawei.com>
Cc: julia.lawall@lip6.fr
Signed-off-by: Ingo Molnar <mingo@kernel.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