Move PSE and PGE bit twiddling from init_memory_mapping() to a new
setup_paging() function to simplify the former function. The
init_memory_mapping() function is called later in the boot process by
gart_iommu_init(), efi_ioremap(), and arch_add_memory() which have no
business whatsover updating the CR4 register.
Cc: Joe Perches <j...@perches.com>
Cc: Tejun Heo <t...@kernel.org>
Cc: Yinghai Lu <ying...@kernel.org>
Signed-off-by: Pekka Enberg <penb...@kernel.org>
---
arch/x86/include/asm/page_types.h | 2 ++
arch/x86/kernel/setup.c | 2 ++
arch/x86/mm/init.c | 23 +++++++++++++----------
3 files changed, 17 insertions(+), 10 deletions(-)
diff --git a/arch/x86/include/asm/page_types.h
b/arch/x86/include/asm/page_types.h
index e21fdd1..529905e 100644
--- a/arch/x86/include/asm/page_types.h
+++ b/arch/x86/include/asm/page_types.h
@@ -51,6 +51,8 @@ static inline phys_addr_t get_max_mapped(void)
return (phys_addr_t)max_pfn_mapped << PAGE_SHIFT;
}
+extern void setup_paging(void);
+
extern unsigned long init_memory_mapping(unsigned long start,
unsigned long end);
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 16be6dc..a883978 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -913,6 +913,8 @@ void __init setup_arch(char **cmdline_p)
init_gbpages();
+ setup_paging();
+
/* max_pfn_mapped is updated here */
max_low_pfn_mapped = init_memory_mapping(0, max_low_pfn<<PAGE_SHIFT);
max_pfn_mapped = max_low_pfn_mapped;
diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
index 4f863cc..a972325 100644
--- a/arch/x86/mm/init.c
+++ b/arch/x86/mm/init.c
@@ -127,6 +127,19 @@ static unsigned long addr_to_pud_pfn(unsigned long addr)
return (addr >> PUD_SHIFT) << (PUD_SHIFT - PAGE_SHIFT);
}
+void setup_paging(void)
+{
+ /* Enable PSE if available */
+ if (cpu_has_pse)
+ set_in_cr4(X86_CR4_PSE);
+
+ /* Enable PGE if available */
+ if (cpu_has_pge) {
+ set_in_cr4(X86_CR4_PGE);
+ __supported_pte_mask |= _PAGE_GLOBAL;
+ }
+}
+
/*
* Setup the direct mapping of the physical memory at PAGE_OFFSET.
* This runs before bootmem is initialized and gets pages directly from
@@ -159,16 +172,6 @@ unsigned long __init_refok init_memory_mapping(unsigned
long start,
use_gbpages = direct_gbpages;
#endif
- /* Enable PSE if available */
- if (cpu_has_pse)
- set_in_cr4(X86_CR4_PSE);
-
- /* Enable PGE if available */
- if (cpu_has_pge) {
- set_in_cr4(X86_CR4_PGE);
- __supported_pte_mask |= _PAGE_GLOBAL;
- }
-
if (use_gbpages)
page_size_mask |= 1 << PG_LEVEL_1G;
if (use_pse)
--
1.7.7.6
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