microblaze: Remove additional setup for kernel_mode

PT_MODE stores information if kernel comes from user
or kernel space. If come from user space, PT_MODE
contains 0. If come from kernel store, PT_MODE contains
non zero value. We don't need to save value 1. I am using
r1 register which contains non zero value.
This change save one additional instruction.

Signed-off-by: Michal Simek <monstr@monstr.eu>

diff --git a/arch/microblaze/kernel/entry.S b/arch/microblaze/kernel/entry.S
index aa611cd..5318ad3 100644 (file)
--- a/arch/microblaze/kernel/entry.S
+++ b/arch/microblaze/kernel/entry.S
@@ -286,8 +286,7 @@ C_ENTRY(_user_exception):
        addik   r1, r1, -STATE_SAVE_SIZE; /* Make room on the stack. */
        SAVE_REGS
 
-       addi    r11, r0, 1;             /* Was in kernel-mode. */
-       swi     r11, r1, PTO+PT_MODE; /* pt_regs -> kernel mode */
+       swi     r1, r1, PTO + PT_MODE; /* pt_regs -> kernel mode */
        brid    2f;
        nop;                            /* Fill delay slot */
 
@@ -303,7 +302,7 @@ C_ENTRY(_user_exception):
        addik   r1, r1, -STATE_SAVE_SIZE; /* Make room on the stack.  */
        SAVE_REGS
 
-       swi     r0, r1, PTO+PT_MODE;                    /* Was in user-mode. */
+       swi     r0, r1, PTO + PT_MODE;                  /* Was in user-mode. */
        lwi     r11, r0, TOPHYS(PER_CPU(ENTRY_SP));
        swi     r11, r1, PTO+PT_R1;             /* Store user SP.  */
 2:     lwi     CURRENT_TASK, r0, TOPHYS(PER_CPU(CURRENT_SAVE));
@@ -380,7 +379,7 @@ C_ENTRY(ret_from_trap):
        swi     r3, r1, PTO + PT_R3
        swi     r4, r1, PTO + PT_R4
 
-       lwi     r11, r1, PTO+PT_MODE;
+       lwi     r11, r1, PTO + PT_MODE;
 /* See if returning to kernel mode, if so, skip resched &c.  */
        bnei    r11, 2f;
        /* We're returning to user mode, so check for various conditions that
@@ -513,8 +512,7 @@ C_ENTRY(sys_rt_sigreturn_wrapper):
        tophys(r1,r1);                                                  \
        addik   r1, r1, -STATE_SAVE_SIZE; /* Make room on the stack.  */\
        SAVE_REGS                                                       \
-       addi    r11, r0, 1;             /* Was in kernel-mode.  */      \
-       swi     r11, r1, PTO+PT_MODE;                                   \
+       swi     r1, r1, PTO+PT_MODE;                                    \
        brid    2f;                                                     \
        nop;                            /* Fill delay slot */           \
 1:     /* User-mode state save.  */                                    \
@@ -525,7 +523,7 @@ C_ENTRY(sys_rt_sigreturn_wrapper):
        tophys(r1,r1);                                                  \
        addik   r1, r1, -STATE_SAVE_SIZE; /* Make room on the stack.  */\
        SAVE_REGS                                                       \
-       swi     r0, r1, PTO+PT_MODE; /* Was in user-mode.  */           \
+       swi     r0, r1, PTO + PT_MODE; /* Was in user-mode.  */         \
        lwi     r11, r0, TOPHYS(PER_CPU(ENTRY_SP));                     \
        swi     r11, r1, PTO+PT_R1; /* Store user SP.  */               \
 2:     lwi     CURRENT_TASK, r0, TOPHYS(PER_CPU(CURRENT_SAVE));
@@ -645,7 +643,7 @@ C_ENTRY(page_fault_instr_trap):
 
 /* Entry point used to return from an exception.  */
 C_ENTRY(ret_from_exc):
-       lwi     r11, r1, PTO+PT_MODE;
+       lwi     r11, r1, PTO + PT_MODE;
        bnei    r11, 2f;                /* See if returning to kernel mode, */
                                        /* ... if so, skip resched &c.  */
 
@@ -733,9 +731,7 @@ C_ENTRY(_interrupt):
 /* MS: Make room on the stack -> activation record */
        addik   r1, r1, -STATE_SAVE_SIZE;
        SAVE_REGS
-       /* MS: store mode */
-       addi    r11, r0, 1; /* MS: Was in kernel-mode. */
-       swi     r11, r1, PTO + PT_MODE; /* MS: and save it */
+       swi     r1, r1, PTO + PT_MODE; /* 0 - user mode, 1 - kernel mode */
        brid    2f;
        nop; /* MS: Fill delay slot */
 
@@ -852,8 +848,7 @@ C_ENTRY(_debug_exception):
        addik   r1, r1, -STATE_SAVE_SIZE; /* Make room on the stack.  */
        SAVE_REGS;
 
-       addi    r11, r0, 1;             /* Was in kernel-mode.  */
-       swi     r11, r1, PTO + PT_MODE;
+       swi     r1, r1, PTO + PT_MODE;
        brid    2f;
        nop;                            /* Fill delay slot */
 1:      /* User-mode state save.  */
@@ -866,7 +861,7 @@ C_ENTRY(_debug_exception):
        addik   r1, r1, -STATE_SAVE_SIZE; /* Make room on the stack.  */
        SAVE_REGS;
 
-       swi     r0, r1, PTO+PT_MODE; /* Was in user-mode.  */
+       swi     r0, r1, PTO + PT_MODE; /* Was in user-mode.  */
        lwi     r11, r0, TOPHYS(PER_CPU(ENTRY_SP));
        swi     r11, r1, PTO+PT_R1; /* Store user SP.  */
 2:
@@ -880,7 +875,7 @@ dbtrap_call:        rtbd    r0, send_sig;
        addik   r15, r0, dbtrap_call;
 
        set_bip;                        /*  Ints masked for state restore*/
-       lwi     r11, r1, PTO+PT_MODE;
+       lwi     r11, r1, PTO + PT_MODE;
        bnei    r11, 2f;
 
        /* Get current task ptr into r11 */