1 files changed, 95 insertions, 95 deletions

diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
index b86f332c96a6..54927784bab9 100644
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
@@ -11,15 +11,15 @@
  *
  * NOTE: This code handles signal-recognition, which happens every time
  * after an interrupt and after each system call.
- * 
- * Normal syscalls and interrupts don't save a full stack frame, this is 
+ *
+ * Normal syscalls and interrupts don't save a full stack frame, this is
  * only done for syscall tracing, signals or fork/exec et.al.
- * 
- * A note on terminology:        
- * - top of stack: Architecture defined interrupt frame from SS to RIP 
- * at the top of the kernel process stack.      
+ *
+ * A note on terminology:
+ * - top of stack: Architecture defined interrupt frame from SS to RIP
+ * at the top of the kernel process stack.
  * - partial stack frame: partially saved registers upto R11.
- * - full stack frame: Like partial stack frame, but all register saved. 
+ * - full stack frame: Like partial stack frame, but all register saved.
  *
  * Some macro usage:
  * - CFI macros are used to generate dwarf2 unwind information for better
@@ -142,7 +142,7 @@ END(mcount)
 
 #ifndef CONFIG_PREEMPT
 #define retint_kernel retint_restore_args
-#endif  
+#endif
 
 #ifdef CONFIG_PARAVIRT
 ENTRY(native_usergs_sysret64)
@@ -161,14 +161,14 @@ ENTRY(native_usergs_sysret64)
 .endm
 
 /*
- * C code is not supposed to know about undefined top of stack. Every time 
- * a C function with an pt_regs argument is called from the SYSCALL based 
+ * C code is not supposed to know about undefined top of stack. Every time
+ * a C function with an pt_regs argument is called from the SYSCALL based
  * fast path FIXUP_TOP_OF_STACK is needed.
  * RESTORE_TOP_OF_STACK syncs the syscall state after any possible ptregs
  * manipulation.
- */             
-                
-        /* %rsp:at FRAMEEND */ 
+ */
+
+        /* %rsp:at FRAMEEND */
         .macro FIXUP_TOP_OF_STACK tmp
         movq    %gs:pda_oldrsp,\tmp
         movq    \tmp,RSP(%rsp)
@@ -244,8 +244,8 @@ ENTRY(native_usergs_sysret64)
         .endm
 /*
  * A newly forked process directly context switches into this.
- */     
-/* rdi: prev */ 
+ */
+/* rdi: prev */
 ENTRY(ret_from_fork)
         CFI_DEFAULT_STACK
         push kernel_eflags(%rip)
@@ -256,7 +256,7 @@ ENTRY(ret_from_fork)
         GET_THREAD_INFO(%rcx)
         testl $(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT),TI_flags(%rcx)
         jnz rff_trace
-rff_action:     
+rff_action:
         RESTORE_REST
         testl $3,CS-ARGOFFSET(%rsp)     # from kernel_thread?
         je   int_ret_from_sys_call
@@ -267,7 +267,7 @@ rff_action:
 rff_trace:
         movq %rsp,%rdi
         call syscall_trace_leave
-        GET_THREAD_INFO(%rcx)   
+        GET_THREAD_INFO(%rcx)
         jmp rff_action
         CFI_ENDPROC
 END(ret_from_fork)
@@ -278,20 +278,20 @@ END(ret_from_fork)
  * SYSCALL does not save anything on the stack and does not change the
  * stack pointer.
  */
-                
+
 /*
- * Register setup:      
+ * Register setup:
  * rax  system call number
  * rdi  arg0
- * rcx  return address for syscall/sysret, C arg3 
+ * rcx  return address for syscall/sysret, C arg3
  * rsi  arg1
- * rdx  arg2    
+ * rdx  arg2
  * r10  arg3    (--> moved to rcx for C)
  * r8   arg4
  * r9   arg5
  * r11  eflags for syscall/sysret, temporary for C
- * r12-r15,rbp,rbx saved by C code, not touched.                
- * 
+ * r12-r15,rbp,rbx saved by C code, not touched.
+ *
  * Interrupts are off on entry.
  * Only called from user space.
  *
@@ -301,7 +301,7 @@ END(ret_from_fork)
  * When user can change the frames always force IRET. That is because
  * it deals with uncanonical addresses better. SYSRET has trouble
  * with them due to bugs in both AMD and Intel CPUs.
- */                                     
+ */
 
 ENTRY(system_call)
         CFI_STARTPROC   simple
@@ -317,7 +317,7 @@ ENTRY(system_call)
          */
 ENTRY(system_call_after_swapgs)
 
-        movq    %rsp,%gs:pda_oldrsp 
+        movq    %rsp,%gs:pda_oldrsp
         movq    %gs:pda_kernelstack,%rsp
         /*
          * No need to follow this irqs off/on section - it's straight
@@ -325,7 +325,7 @@ ENTRY(system_call_after_swapgs)
          */
         ENABLE_INTERRUPTS(CLBR_NONE)
         SAVE_ARGS 8,1
-        movq  %rax,ORIG_RAX-ARGOFFSET(%rsp) 
+        movq  %rax,ORIG_RAX-ARGOFFSET(%rsp)
         movq  %rcx,RIP-ARGOFFSET(%rsp)
         CFI_REL_OFFSET rip,RIP-ARGOFFSET
         GET_THREAD_INFO(%rcx)
@@ -339,19 +339,19 @@ system_call_fastpath:
         movq %rax,RAX-ARGOFFSET(%rsp)
 /*
  * Syscall return path ending with SYSRET (fast path)
- * Has incomplete stack frame and undefined top of stack. 
- */             
+ * Has incomplete stack frame and undefined top of stack.
+ */
 ret_from_sys_call:
         movl $_TIF_ALLWORK_MASK,%edi
         /* edi: flagmask */
-sysret_check:           
+sysret_check:
         LOCKDEP_SYS_EXIT
         GET_THREAD_INFO(%rcx)
         DISABLE_INTERRUPTS(CLBR_NONE)
         TRACE_IRQS_OFF
         movl TI_flags(%rcx),%edx
         andl %edi,%edx
-        jnz  sysret_careful 
+        jnz  sysret_careful
         CFI_REMEMBER_STATE
         /*
          * sysretq will re-enable interrupts:
@@ -366,7 +366,7 @@ sysret_check:
 
         CFI_RESTORE_STATE
         /* Handle reschedules */
-        /* edx: work, edi: workmask */  
+        /* edx: work, edi: workmask */
 sysret_careful:
         bt $TIF_NEED_RESCHED,%edx
         jnc sysret_signal
@@ -379,7 +379,7 @@ sysret_careful:
         CFI_ADJUST_CFA_OFFSET -8
         jmp sysret_check
 
-        /* Handle a signal */ 
+        /* Handle a signal */
 sysret_signal:
         TRACE_IRQS_ON
         ENABLE_INTERRUPTS(CLBR_NONE)
@@ -398,7 +398,7 @@ sysret_signal:
         DISABLE_INTERRUPTS(CLBR_NONE)
         TRACE_IRQS_OFF
         jmp int_with_check
-        
+
 badsys:
         movq $-ENOSYS,RAX-ARGOFFSET(%rsp)
         jmp ret_from_sys_call
@@ -437,7 +437,7 @@ sysret_audit:
 #endif  /* CONFIG_AUDITSYSCALL */
 
         /* Do syscall tracing */
-tracesys:                        
+tracesys:
 #ifdef CONFIG_AUDITSYSCALL
         testl $(_TIF_WORK_SYSCALL_ENTRY & ~_TIF_SYSCALL_AUDIT),TI_flags(%rcx)
         jz auditsys
@@ -460,8 +460,8 @@ tracesys:
         call *sys_call_table(,%rax,8)
         movq %rax,RAX-ARGOFFSET(%rsp)
         /* Use IRET because user could have changed frame */
-                
-/* 
+
+/*
  * Syscall return path ending with IRET.
  * Has correct top of stack, but partial stack frame.
  */
@@ -505,18 +505,18 @@ int_very_careful:
         TRACE_IRQS_ON
         ENABLE_INTERRUPTS(CLBR_NONE)
         SAVE_REST
-        /* Check for syscall exit trace */      
+        /* Check for syscall exit trace */
         testl $_TIF_WORK_SYSCALL_EXIT,%edx
         jz int_signal
         pushq %rdi
         CFI_ADJUST_CFA_OFFSET 8
-        leaq 8(%rsp),%rdi       # &ptregs -> arg1       
+        leaq 8(%rsp),%rdi       # &ptregs -> arg1
         call syscall_trace_leave
         popq %rdi
         CFI_ADJUST_CFA_OFFSET -8
         andl $~(_TIF_WORK_SYSCALL_EXIT|_TIF_SYSCALL_EMU),%edi
         jmp int_restore_rest
-        
+
 int_signal:
         testl $_TIF_DO_NOTIFY_MASK,%edx
         jz 1f
@@ -531,11 +531,11 @@ int_restore_rest:
         jmp int_with_check
         CFI_ENDPROC
 END(system_call)
-                
-/* 
+
+/*
  * Certain special system calls that need to save a complete full stack frame.
- */                                                             
-        
+ */
+
         .macro PTREGSCALL label,func,arg
         .globl \label
 \label:
@@ -572,7 +572,7 @@ ENTRY(ptregscall_common)
         ret
         CFI_ENDPROC
 END(ptregscall_common)
-        
+
 ENTRY(stub_execve)
         CFI_STARTPROC
         popq %r11
@@ -588,11 +588,11 @@ ENTRY(stub_execve)
         jmp int_ret_from_sys_call
         CFI_ENDPROC
 END(stub_execve)
-        
+
 /*
  * sigreturn is special because it needs to restore all registers on return.
  * This cannot be done with SYSRET, so use the IRET return path instead.
- */                
+ */
 ENTRY(stub_rt_sigreturn)
         CFI_STARTPROC
         addq $8, %rsp
@@ -685,12 +685,12 @@ exit_intr:
         GET_THREAD_INFO(%rcx)
         testl $3,CS-ARGOFFSET(%rsp)
         je retint_kernel
-        
+
         /* Interrupt came from user space */
         /*
          * Has a correct top of stack, but a partial stack frame
          * %rcx: thread info. Interrupts off.
-         */             
+         */
 retint_with_reschedule:
         movl $_TIF_WORK_MASK,%edi
 retint_check:
@@ -763,20 +763,20 @@ retint_careful:
         pushq %rdi
         CFI_ADJUST_CFA_OFFSET   8
         call  schedule
-        popq %rdi               
+        popq %rdi
         CFI_ADJUST_CFA_OFFSET   -8
         GET_THREAD_INFO(%rcx)
         DISABLE_INTERRUPTS(CLBR_NONE)
         TRACE_IRQS_OFF
         jmp retint_check
-        
+
 retint_signal:
         testl $_TIF_DO_NOTIFY_MASK,%edx
         jz    retint_swapgs
         TRACE_IRQS_ON
         ENABLE_INTERRUPTS(CLBR_NONE)
         SAVE_REST
-        movq $-1,ORIG_RAX(%rsp)                         
+        movq $-1,ORIG_RAX(%rsp)
         xorl %esi,%esi          # oldset
         movq %rsp,%rdi          # &pt_regs
         call do_notify_resume
@@ -798,14 +798,14 @@ ENTRY(retint_kernel)
         jnc  retint_restore_args
         call preempt_schedule_irq
         jmp exit_intr
-#endif  
+#endif
 
         CFI_ENDPROC
 END(common_interrupt)
-        
+
 /*
  * APIC interrupts.
- */             
+ */
         .macro apicinterrupt num,func
         INTR_FRAME
         pushq $~(\num)
@@ -823,14 +823,14 @@ ENTRY(threshold_interrupt)
         apicinterrupt THRESHOLD_APIC_VECTOR,mce_threshold_interrupt
 END(threshold_interrupt)
 
-#ifdef CONFIG_SMP       
+#ifdef CONFIG_SMP
 ENTRY(reschedule_interrupt)
         apicinterrupt RESCHEDULE_VECTOR,smp_reschedule_interrupt
 END(reschedule_interrupt)
 
         .macro INVALIDATE_ENTRY num
 ENTRY(invalidate_interrupt\num)
-        apicinterrupt INVALIDATE_TLB_VECTOR_START+\num,smp_invalidate_interrupt 
+        apicinterrupt INVALIDATE_TLB_VECTOR_START+\num,smp_invalidate_interrupt
 END(invalidate_interrupt\num)
         .endm
 
@@ -869,22 +869,22 @@ END(error_interrupt)
 ENTRY(spurious_interrupt)
         apicinterrupt SPURIOUS_APIC_VECTOR,smp_spurious_interrupt
 END(spurious_interrupt)
-                                
+
 /*
  * Exception entry points.
- */             
+ */
         .macro zeroentry sym
         INTR_FRAME
         PARAVIRT_ADJUST_EXCEPTION_FRAME
-        pushq $0        /* push error code/oldrax */ 
+        pushq $0        /* push error code/oldrax */
         CFI_ADJUST_CFA_OFFSET 8
-        pushq %rax      /* push real oldrax to the rdi slot */ 
+        pushq %rax      /* push real oldrax to the rdi slot */
         CFI_ADJUST_CFA_OFFSET 8
         CFI_REL_OFFSET rax,0
         leaq  \sym(%rip),%rax
         jmp error_entry
         CFI_ENDPROC
-        .endm   
+        .endm
 
         .macro errorentry sym
         XCPT_FRAME
@@ -998,13 +998,13 @@ paranoid_schedule\trace:
 
 /*
  * Exception entry point. This expects an error code/orig_rax on the stack
- * and the exception handler in %rax.   
- */                                             
+ * and the exception handler in %rax.
+ */
 KPROBE_ENTRY(error_entry)
         _frame RDI
         CFI_REL_OFFSET rax,0
         /* rdi slot contains rax, oldrax contains error code */
-        cld     
+        cld
         subq  $14*8,%rsp
         CFI_ADJUST_CFA_OFFSET   (14*8)
         movq %rsi,13*8(%rsp)
@@ -1015,7 +1015,7 @@ KPROBE_ENTRY(error_entry)
         CFI_REL_OFFSET  rdx,RDX
         movq %rcx,11*8(%rsp)
         CFI_REL_OFFSET  rcx,RCX
-        movq %rsi,10*8(%rsp)    /* store rax */ 
+        movq %rsi,10*8(%rsp)    /* store rax */
         CFI_REL_OFFSET  rax,RAX
         movq %r8, 9*8(%rsp)
         CFI_REL_OFFSET  r8,R8
@@ -1025,29 +1025,29 @@ KPROBE_ENTRY(error_entry)
         CFI_REL_OFFSET  r10,R10
         movq %r11,6*8(%rsp)
         CFI_REL_OFFSET  r11,R11
-        movq %rbx,5*8(%rsp) 
+        movq %rbx,5*8(%rsp)
         CFI_REL_OFFSET  rbx,RBX
-        movq %rbp,4*8(%rsp) 
+        movq %rbp,4*8(%rsp)
         CFI_REL_OFFSET  rbp,RBP
-        movq %r12,3*8(%rsp) 
+        movq %r12,3*8(%rsp)
         CFI_REL_OFFSET  r12,R12
-        movq %r13,2*8(%rsp) 
+        movq %r13,2*8(%rsp)
         CFI_REL_OFFSET  r13,R13
-        movq %r14,1*8(%rsp) 
+        movq %r14,1*8(%rsp)
         CFI_REL_OFFSET  r14,R14
-        movq %r15,(%rsp) 
+        movq %r15,(%rsp)
         CFI_REL_OFFSET  r15,R15
-        xorl %ebx,%ebx  
+        xorl %ebx,%ebx
         testl $3,CS(%rsp)
         je  error_kernelspace
-error_swapgs:   
+error_swapgs:
         SWAPGS
 error_sti:
         TRACE_IRQS_OFF
-        movq %rdi,RDI(%rsp)     
+        movq %rdi,RDI(%rsp)
         CFI_REL_OFFSET  rdi,RDI
         movq %rsp,%rdi
-        movq ORIG_RAX(%rsp),%rsi        /* get error code */ 
+        movq ORIG_RAX(%rsp),%rsi        /* get error code */
         movq $-1,ORIG_RAX(%rsp)
         call *%rax
         /* ebx: no swapgs flag (1: don't need swapgs, 0: need it) */
@@ -1056,7 +1056,7 @@ error_exit:
         RESTORE_REST
         DISABLE_INTERRUPTS(CLBR_NONE)
         TRACE_IRQS_OFF
-        GET_THREAD_INFO(%rcx)   
+        GET_THREAD_INFO(%rcx)
         testl %eax,%eax
         jne  retint_kernel
         LOCKDEP_SYS_EXIT_IRQ
@@ -1072,7 +1072,7 @@ error_kernelspace:
        /* There are two places in the kernel that can potentially fault with
           usergs. Handle them here. The exception handlers after
            iret run with kernel gs again, so don't set the user space flag.
-           B stepping K8s sometimes report an truncated RIP for IRET 
+           B stepping K8s sometimes report an truncated RIP for IRET
            exceptions returning to compat mode. Check for these here too. */
         leaq irq_return(%rip),%rcx
         cmpq %rcx,RIP(%rsp)
@@ -1084,17 +1084,17 @@ error_kernelspace:
         je   error_swapgs
         jmp  error_sti
 KPROBE_END(error_entry)
-        
+
        /* Reload gs selector with exception handling */
-       /* edi:  new selector */ 
+       /* edi:  new selector */
 ENTRY(native_load_gs_index)
         CFI_STARTPROC
         pushf
         CFI_ADJUST_CFA_OFFSET 8
         DISABLE_INTERRUPTS(CLBR_ANY | ~(CLBR_RDI))
         SWAPGS
-gs_change:     
-        movl %edi,%gs   
+gs_change:
+        movl %edi,%gs
 2:      mfence          /* workaround */
         SWAPGS
         popf
@@ -1102,20 +1102,20 @@ gs_change:
         ret
         CFI_ENDPROC
 ENDPROC(native_load_gs_index)
-       
+
         .section __ex_table,"a"
         .align 8
         .quad gs_change,bad_gs
         .previous
         .section .fixup,"ax"
         /* running with kernelgs */
-bad_gs: 
+bad_gs:
         SWAPGS                  /* switch back to user gs */
         xorl %eax,%eax
         movl %eax,%gs
         jmp  2b
-        .previous       
-        
+        .previous
+
 /*
  * Create a kernel thread.
  *
@@ -1138,7 +1138,7 @@ ENTRY(kernel_thread)
 
         xorl %r8d,%r8d
         xorl %r9d,%r9d
-        
+
         # clone now
         call do_fork
         movq %rax,RAX(%rsp)
@@ -1149,14 +1149,14 @@ ENTRY(kernel_thread)
          * so internally to the x86_64 port you can rely on kernel_thread()
          * not to reschedule the child before returning, this avoids the need
          * of hacks for example to fork off the per-CPU idle tasks.
-         * [Hopefully no generic code relies on the reschedule -AK]     
+         * [Hopefully no generic code relies on the reschedule -AK]
          */
         RESTORE_ALL
         UNFAKE_STACK_FRAME
         ret
         CFI_ENDPROC
 ENDPROC(kernel_thread)
-        
+
 child_rip:
         pushq $0                # fake return address
         CFI_STARTPROC
@@ -1191,10 +1191,10 @@ ENDPROC(child_rip)
 ENTRY(kernel_execve)
         CFI_STARTPROC
         FAKE_STACK_FRAME $0
-        SAVE_ALL        
+        SAVE_ALL
         movq %rsp,%rcx
         call sys_execve
-        movq %rax, RAX(%rsp)    
+        movq %rax, RAX(%rsp)
         RESTORE_REST
         testq %rax,%rax
         je int_ret_from_sys_call
@@ -1213,7 +1213,7 @@ ENTRY(coprocessor_error)
 END(coprocessor_error)
 
 ENTRY(simd_coprocessor_error)
-        zeroentry do_simd_coprocessor_error     
+        zeroentry do_simd_coprocessor_error
 END(simd_coprocessor_error)
 
 ENTRY(device_not_available)
@@ -1225,12 +1225,12 @@ KPROBE_ENTRY(debug)
         INTR_FRAME
         PARAVIRT_ADJUST_EXCEPTION_FRAME
         pushq $0
-        CFI_ADJUST_CFA_OFFSET 8         
+        CFI_ADJUST_CFA_OFFSET 8
         paranoidentry do_debug, DEBUG_STACK
         paranoidexit
 KPROBE_END(debug)
 
-        /* runs on exception stack */   
+        /* runs on exception stack */
 KPROBE_ENTRY(nmi)
         INTR_FRAME
         PARAVIRT_ADJUST_EXCEPTION_FRAME
@@ -1264,7 +1264,7 @@ ENTRY(bounds)
 END(bounds)
 
 ENTRY(invalid_op)
-        zeroentry do_invalid_op 
+        zeroentry do_invalid_op
 END(invalid_op)
 
 ENTRY(coprocessor_segment_overrun)
@@ -1319,7 +1319,7 @@ ENTRY(machine_check)
         INTR_FRAME
         PARAVIRT_ADJUST_EXCEPTION_FRAME
         pushq $0
-        CFI_ADJUST_CFA_OFFSET 8 
+        CFI_ADJUST_CFA_OFFSET 8
         paranoidentry do_machine_check
         jmp paranoid_exit1
         CFI_ENDPROC