x86/tlb: Refactor CR4 setting and shadow write

Refactor the write to CR4 and its shadow value. This is done in
preparation for the addition of an assertion to check that IRQs are
disabled during CR4 update.

No functional change.

Signed-off-by: Nadav Amit <namit@vmware.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: nadav.amit@gmail.com
Cc: Andy Lutomirski <luto@kernel.org>
Cc: linux-edac@vger.kernel.org
Link: https://lkml.kernel.org/r/20171125032907.2241-2-namit@vmware.com

diff --git a/arch/x86/include/asm/tlbflush.h b/arch/x86/include/asm/tlbflush.h
index 509046cfa5ce893357366348468a5c5ff8e86a09..e736f7f0ba924397badf49bb92298ce51b1efeb0 100644 (file)
--- a/arch/x86/include/asm/tlbflush.h
+++ b/arch/x86/include/asm/tlbflush.h
@@ -173,17 +173,20 @@ static inline void cr4_init_shadow(void)
        this_cpu_write(cpu_tlbstate.cr4, __read_cr4());
 }
 
+static inline void __cr4_set(unsigned long cr4)
+{
+       this_cpu_write(cpu_tlbstate.cr4, cr4);
+       __write_cr4(cr4);
+}
+
 /* Set in this cpu's CR4. */
 static inline void cr4_set_bits(unsigned long mask)
 {
        unsigned long cr4;
 
        cr4 = this_cpu_read(cpu_tlbstate.cr4);
-       if ((cr4 | mask) != cr4) {
-               cr4 |= mask;
-               this_cpu_write(cpu_tlbstate.cr4, cr4);
-               __write_cr4(cr4);
-       }
+       if ((cr4 | mask) != cr4)
+               __cr4_set(cr4 | mask);
 }
 
 /* Clear in this cpu's CR4. */
@@ -192,11 +195,8 @@ static inline void cr4_clear_bits(unsigned long mask)
        unsigned long cr4;
 
        cr4 = this_cpu_read(cpu_tlbstate.cr4);
-       if ((cr4 & ~mask) != cr4) {
-               cr4 &= ~mask;
-               this_cpu_write(cpu_tlbstate.cr4, cr4);
-               __write_cr4(cr4);
-       }
+       if ((cr4 & ~mask) != cr4)
+               __cr4_set(cr4 & ~mask);
 }
 
 static inline void cr4_toggle_bits(unsigned long mask)
@@ -204,9 +204,7 @@ static inline void cr4_toggle_bits(unsigned long mask)
        unsigned long cr4;
 
        cr4 = this_cpu_read(cpu_tlbstate.cr4);
-       cr4 ^= mask;
-       this_cpu_write(cpu_tlbstate.cr4, cr4);
-       __write_cr4(cr4);
+       __cr4_set(cr4 ^ mask);
 }
 
 /* Read the CR4 shadow. */