x86, flags: Rename X86_EFLAGS_BIT1 to X86_EFLAGS_FIXED

Bit 1 in the x86 EFLAGS is always set.  Name the macro something that
actually tries to explain what it is all about, rather than being a
tautology.

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Gleb Natapov <gleb@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Link: http://lkml.kernel.org/n/tip-f10rx5vjjm6tfnt8o1wseb3v@git.kernel.org

arch/x86/include/uapi/asm/processor-flags.h

@@ -6,7 +6,7 @@
  * EFLAGS bits
  */
 #define X86_EFLAGS_CF	0x00000001 /* Carry Flag */
-#define X86_EFLAGS_BIT1	0x00000002 /* Bit 1 - always on */
+#define X86_EFLAGS_FIXED 0x00000002 /* Bit 1 - always on */
 #define X86_EFLAGS_PF	0x00000004 /* Parity Flag */
 #define X86_EFLAGS_AF	0x00000010 /* Auxiliary carry Flag */
 #define X86_EFLAGS_ZF	0x00000040 /* Zero Flag */

arch/x86/kernel/entry_64.S

@@ -365,7 +365,7 @@ ENDPROC(native_usergs_sysret64)
 	/*CFI_REL_OFFSET	ss,0*/
 	pushq_cfi %rax /* rsp */
 	CFI_REL_OFFSET	rsp,0
-	pushq_cfi $(X86_EFLAGS_IF|X86_EFLAGS_BIT1) /* eflags - interrupts on */
+	pushq_cfi $(X86_EFLAGS_IF|X86_EFLAGS_FIXED) /* eflags - interrupts on */
 	/*CFI_REL_OFFSET	rflags,0*/
 	pushq_cfi $__KERNEL_CS /* cs */
 	/*CFI_REL_OFFSET	cs,0*/

arch/x86/kernel/process_32.c

@@ -147,7 +147,7 @@ int copy_thread(unsigned long clone_flags, unsigned long sp,
 		childregs->bp = arg;
 		childregs->orig_ax = -1;
 		childregs->cs = __KERNEL_CS | get_kernel_rpl();
-		childregs->flags = X86_EFLAGS_IF | X86_EFLAGS_BIT1;
+		childregs->flags = X86_EFLAGS_IF | X86_EFLAGS_FIXED;
 		p->fpu_counter = 0;
 		p->thread.io_bitmap_ptr = NULL;
 		memset(p->thread.ptrace_bps, 0, sizeof(p->thread.ptrace_bps));

arch/x86/kernel/process_64.c

@@ -176,7 +176,7 @@ int copy_thread(unsigned long clone_flags, unsigned long sp,
 		childregs->bp = arg;
 		childregs->orig_ax = -1;
 		childregs->cs = __KERNEL_CS | get_kernel_rpl();
-		childregs->flags = X86_EFLAGS_IF | X86_EFLAGS_BIT1;
+		childregs->flags = X86_EFLAGS_IF | X86_EFLAGS_FIXED;
 		return 0;
 	}
 	*childregs = *current_pt_regs();

arch/x86/kvm/vmx.c

@@ -7942,7 +7942,7 @@ static void load_vmcs12_host_state(struct kvm_vcpu *vcpu,
 
 	kvm_register_write(vcpu, VCPU_REGS_RSP, vmcs12->host_rsp);
 	kvm_register_write(vcpu, VCPU_REGS_RIP, vmcs12->host_rip);
-	vmx_set_rflags(vcpu, X86_EFLAGS_BIT1);
+	vmx_set_rflags(vcpu, X86_EFLAGS_FIXED);
 	/*
 	 * Note that calling vmx_set_cr0 is important, even if cr0 hasn't
 	 * actually changed, because it depends on the current state of

drivers/lguest/x86/core.c

@@ -700,7 +700,7 @@ void lguest_arch_setup_regs(struct lg_cpu *cpu, unsigned long start)
 	 * interrupts are enabled.  We always leave interrupts enabled while
 	 * running the Guest.
 	 */
-	regs->eflags = X86_EFLAGS_IF | X86_EFLAGS_BIT1;
+	regs->eflags = X86_EFLAGS_IF | X86_EFLAGS_FIXED;
 
 	/*
 	 * The "Extended Instruction Pointer" register says where the Guest is