MIPS: Remove unused task_struct.trap_no field.

It is initialized to zero and only ever read.  Remove it, and pass zero in
its place.

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
To: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/1531/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

3 files changed, 1 insertions, 4 deletions

diff --git a/arch/mips/include/asm/processor.h b/arch/mips/include/asm/processor.h
index 24d91f8618f0..0d629bb93cbe 100644
--- a/arch/mips/include/asm/processor.h
+++ b/arch/mips/include/asm/processor.h
@@ -229,7 +229,6 @@ struct thread_struct {
         unsigned long cp0_badvaddr;     /* Last user fault */
         unsigned long cp0_baduaddr;     /* Last kernel fault accessing USEG */
         unsigned long error_code;
-        unsigned long trap_no;
         unsigned long irix_trampoline;  /* Wheee... */
         unsigned long irix_oldctx;
 #ifdef CONFIG_CPU_CAVIUM_OCTEON
@@ -301,7 +300,6 @@ struct thread_struct {
         .cp0_badvaddr           = 0,                            \
         .cp0_baduaddr           = 0,                            \
         .error_code             = 0,                            \
-        .trap_no                = 0,                            \
         .irix_trampoline        = 0,                            \
         .irix_oldctx            = 0,                            \
         /*                                                      \
diff --git a/arch/mips/kernel/asm-offsets.c b/arch/mips/kernel/asm-offsets.c
index ca6c83218caa..6b30fb2caa67 100644
--- a/arch/mips/kernel/asm-offsets.c
+++ b/arch/mips/kernel/asm-offsets.c
@@ -126,7 +126,6 @@ void output_thread_defines(void)
                thread.cp0_baduaddr);
         OFFSET(THREAD_ECODE, task_struct, \
                thread.error_code);
-        OFFSET(THREAD_TRAPNO, task_struct, thread.trap_no);
         OFFSET(THREAD_TRAMP, task_struct, \
                thread.irix_trampoline);
         OFFSET(THREAD_OLDCTX, task_struct, \
diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index 4c6079f24958..6019e9ea9a6b 100644
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -376,7 +376,7 @@ void __noreturn die(const char * str, struct pt_regs * regs)
         mips_mt_regdump(dvpret);
 #endif /* CONFIG_MIPS_MT_SMTC */
 
-        if (notify_die(DIE_OOPS, str, regs, 0, current->thread.trap_no, SIGSEGV) == NOTIFY_STOP)
+        if (notify_die(DIE_OOPS, str, regs, 0, 0, SIGSEGV) == NOTIFY_STOP)
                 sig = 0;
 
         printk("%s[#%d]:\n", str, ++die_counter);