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x86/mm: Unify pgtable_l5_enabled usage in early boot code 

Usually pgtable_l5_enabled is defined using cpu_feature_enabled().
cpu_feature_enabled() is not available in early boot code. We use
several different preprocessor tricks to get around it. It's messy.

Unify them all.

If cpu_feature_enabled() is not yet available, USE_EARLY_PGTABLE_L5 can
be defined before all includes. It makes pgtable_l5_enabled rely on
__pgtable_l5_enabled variable instead. This approach fits all early
users.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Hugh Dickins <hughd@google.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20180518103528.59260-3-kirill.shutemov@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Kirill A. Shutemov 2018-05-18 13:35:23 +03:00 committed by Ingo Molnar
parent 30bbf728ba
commit ad3fe525b9
5 changed files with 21 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/x86/boot/compressed/kaslr.c
View File

@ -47,7 +47,7 @@
#include <linux/decompress/mm.h>
#ifdef CONFIG_X86_5LEVEL
unsigned int pgtable_l5_enabled __ro_after_init;
unsigned int __pgtable_l5_enabled;
unsigned int pgdir_shift __ro_after_init = 39;
unsigned int ptrs_per_p4d __ro_after_init = 1;
#endif
@ -734,7 +734,7 @@ void choose_random_location(unsigned long input,
#ifdef CONFIG_X86_5LEVEL
if (__read_cr4() & X86_CR4_LA57) {
pgtable_l5_enabled = 1;
__pgtable_l5_enabled = 1;
pgdir_shift = 48;
ptrs_per_p4d = 512;
}

6
arch/x86/boot/compressed/misc.h
View File

@ -12,10 +12,8 @@
#undef CONFIG_PARAVIRT_SPINLOCKS
#undef CONFIG_KASAN
#ifdef CONFIG_X86_5LEVEL
/* cpu_feature_enabled() cannot be used that early */
#define pgtable_l5_enabled __pgtable_l5_enabled
#endif
/* cpu_feature_enabled() cannot be used this early */
#define USE_EARLY_PGTABLE_L5
#include <linux/linkage.h>
#include <linux/screen_info.h>

13
arch/x86/include/asm/pgtable_64_types.h
View File

@ -22,12 +22,19 @@ typedef struct { pteval_t pte; } pte_t;
#ifdef CONFIG_X86_5LEVEL
extern unsigned int __pgtable_l5_enabled;
#ifndef pgtable_l5_enabled
#ifdef USE_EARLY_PGTABLE_L5
/*
* cpu_feature_enabled() is not available in early boot code.
* Use variable instead.
*/
#define pgtable_l5_enabled __pgtable_l5_enabled
#else
#define pgtable_l5_enabled cpu_feature_enabled(X86_FEATURE_LA57)
#endif
#endif /* USE_EARLY_PGTABLE_L5 */
#else
#define pgtable_l5_enabled 0
#endif
#endif /* CONFIG_X86_5LEVEL */
extern unsigned int pgdir_shift;
extern unsigned int ptrs_per_p4d;

12
arch/x86/kernel/head64.c
View File

@ -6,6 +6,10 @@
*/
#define DISABLE_BRANCH_PROFILING
/* cpu_feature_enabled() cannot be used this early */
#define USE_EARLY_PGTABLE_L5
#include <linux/init.h>
#include <linux/linkage.h>
#include <linux/types.h>
@ -32,11 +36,6 @@
#include <asm/microcode.h>
#include <asm/kasan.h>
#ifdef CONFIG_X86_5LEVEL
#undef pgtable_l5_enabled
#define pgtable_l5_enabled __pgtable_l5_enabled
#endif
/*
* Manage page tables very early on.
*/
@ -46,7 +45,6 @@ pmdval_t early_pmd_flags = __PAGE_KERNEL_LARGE & ~(_PAGE_GLOBAL | _PAGE_NX);
#ifdef CONFIG_X86_5LEVEL
unsigned int __pgtable_l5_enabled __ro_after_init;
EXPORT_SYMBOL(__pgtable_l5_enabled);
unsigned int pgdir_shift __ro_after_init = 39;
EXPORT_SYMBOL(pgdir_shift);
unsigned int ptrs_per_p4d __ro_after_init = 1;
@ -88,7 +86,7 @@ static bool __head check_la57_support(unsigned long physaddr)
if (!(native_cpuid_ecx(7) & (1 << (X86_FEATURE_LA57 & 31))))
return false;
*fixup_int(&pgtable_l5_enabled, physaddr) = 1;
*fixup_int(&__pgtable_l5_enabled, physaddr) = 1;
*fixup_int(&pgdir_shift, physaddr) = 48;
*fixup_int(&ptrs_per_p4d, physaddr) = 512;
*fixup_long(&page_offset_base, physaddr) = __PAGE_OFFSET_BASE_L5;

6
arch/x86/mm/kasan_init_64.c
View File

@ -2,10 +2,8 @@
#define DISABLE_BRANCH_PROFILING
#define pr_fmt(fmt) "kasan: " fmt
#ifdef CONFIG_X86_5LEVEL
/* Too early to use cpu_feature_enabled() */
#define pgtable_l5_enabled __pgtable_l5_enabled
#endif
/* cpu_feature_enabled() cannot be used this early */
#define USE_EARLY_PGTABLE_L5
#include <linux/bootmem.h>
#include <linux/kasan.h>