Blackfin arch: scrub dead code

we converted to using a system call for userspace spinlocks
rather than a dedicated exception long ago

Signed-off-by: Mike Frysinger <michael.frysinger@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>

2 files changed, 5 insertions, 37 deletions

diff --git a/arch/blackfin/kernel/traps.c b/arch/blackfin/kernel/traps.c
index 114277bb46f8..3909f5b35536 100644
--- a/arch/blackfin/kernel/traps.c
+++ b/arch/blackfin/kernel/traps.c
@@ -193,15 +193,14 @@ asmlinkage void trap_c(struct pt_regs *fp)
 #else
         /* 0x02 - User Defined, Caught by default */
 #endif
-        /* 0x03  - Atomic test and set */
+        /* 0x03 - User Defined, userspace stack overflow */
         case VEC_EXCPT03:
                 info.si_code = SEGV_STACKFLOW;
                 sig = SIGSEGV;
                 printk(KERN_EMERG EXC_0x03);
                 CHK_DEBUGGER_TRAP();
                 break;
-        /* 0x04 - spinlock - handled by _ex_spinlock,
-                getting here is an error */
+        /* 0x04 - User Defined, Caught by default */
         /* 0x05 - User Defined, Caught by default */
         /* 0x06 - User Defined, Caught by default */
         /* 0x07 - User Defined, Caught by default */
diff --git a/arch/blackfin/mach-common/entry.S b/arch/blackfin/mach-common/entry.S
index fa4e6336317d..d61bba98fb54 100644
--- a/arch/blackfin/mach-common/entry.S
+++ b/arch/blackfin/mach-common/entry.S
@@ -97,17 +97,6 @@ ENTRY(_ex_icplb)
         rtx;
 ENDPROC(_ex_icplb)
 
-ENTRY(_ex_spinlock)
-        /* Transform this into a syscall - twiddle the syscall vector.  */
-        p5.l = lo(EVT15);
-        p5.h = hi(EVT15);
-        r7.l = _spinlock_bh;
-        r7.h = _spinlock_bh;
-        [p5] = r7;
-        csync;
-        /* Fall through.  */
-ENDPROC(_ex_spinlock)
-
 ENTRY(_ex_syscall)
         DEBUG_START_HWTRACE(p5, r7)
         (R7:6,P5:4) = [sp++];
@@ -117,26 +106,6 @@ ENTRY(_ex_syscall)
         rtx
 ENDPROC(_ex_syscall)
 
-ENTRY(_spinlock_bh)
-        SAVE_ALL_SYS
-        /* To end up here, vector 15 was changed - so we have to change it
-         * back.
-         */
-        p0.l = lo(EVT15);
-        p0.h = hi(EVT15);
-        p1.l = _evt_system_call;
-        p1.h = _evt_system_call;
-        [p0] = p1;
-        csync;
-        r0 = [sp + PT_R0];
-        sp += -12;
-        call _sys_bfin_spinlock;
-        sp += 12;
-        [SP + PT_R0] = R0;
-        RESTORE_ALL_SYS
-        rti;
-ENDPROC(_spinlock_bh)
-
 ENTRY(_ex_soft_bp)
         r7 = retx;
         r7 += -2;
@@ -775,14 +744,14 @@ ENDPROC(_init_exception_buff)
 ALIGN
 _extable:
         /* entry for each EXCAUSE[5:0]
-         * This table bmust be in sync with the table in ./kernel/traps.c
+         * This table must be in sync with the table in ./kernel/traps.c
          * EXCPT instruction can provide 4 bits of EXCAUSE, allowing 16 to be user defined
          */
         .long _ex_syscall;      /* 0x00 - User Defined - Linux Syscall */
         .long _ex_soft_bp       /* 0x01 - User Defined - Software breakpoint */
         .long _ex_trap_c        /* 0x02 - User Defined */
-        .long _ex_trap_c        /* 0x03 - User Defined  - Atomic test and set service */
-        .long _ex_spinlock      /* 0x04 - User Defined */
+        .long _ex_trap_c        /* 0x03 - User Defined - userspace stack overflow */
+        .long _ex_trap_c        /* 0x04 - User Defined */
         .long _ex_trap_c        /* 0x05 - User Defined */
         .long _ex_trap_c        /* 0x06 - User Defined */
         .long _ex_trap_c        /* 0x07 - User Defined */