diff options
Diffstat (limited to 'include/asm-x86/tlbflush.h')
| -rw-r--r-- | include/asm-x86/tlbflush.h | 19 |
1 files changed, 15 insertions, 4 deletions
diff --git a/include/asm-x86/tlbflush.h b/include/asm-x86/tlbflush.h index 0c0674d9425..ef68b76dc3c 100644 --- a/include/asm-x86/tlbflush.h +++ b/include/asm-x86/tlbflush.h @@ -1,5 +1,5 @@ -#ifndef _ASM_X86_TLBFLUSH_H -#define _ASM_X86_TLBFLUSH_H +#ifndef ASM_X86__TLBFLUSH_H +#define ASM_X86__TLBFLUSH_H #include <linux/mm.h> #include <linux/sched.h> @@ -22,12 +22,23 @@ static inline void __native_flush_tlb(void) static inline void __native_flush_tlb_global(void) { - unsigned long cr4 = read_cr4(); + unsigned long flags; + unsigned long cr4; + /* + * Read-modify-write to CR4 - protect it from preemption and + * from interrupts. (Use the raw variant because this code can + * be called from deep inside debugging code.) + */ + raw_local_irq_save(flags); + + cr4 = read_cr4(); /* clear PGE */ write_cr4(cr4 & ~X86_CR4_PGE); /* write old PGE again and flush TLBs */ write_cr4(cr4); + + raw_local_irq_restore(flags); } static inline void __native_flush_tlb_single(unsigned long addr) @@ -154,4 +165,4 @@ static inline void flush_tlb_kernel_range(unsigned long start, flush_tlb_all(); } -#endif /* _ASM_X86_TLBFLUSH_H */ +#endif /* ASM_X86__TLBFLUSH_H */ |