ARC: Entry Handler tweaks: Optimize away redundant IRQ_DISABLE_SAVE

In the exception return path, for both U/K cases, intr are already
disabled (for various existing reasons). So when we drop down to
@restore_regs, we need not redo that.

There was subtle issue - when intr were NOT being disabled for
ret-to-kernel-but-no-preemption case - now fixed by moving the
IRQ_DISABLE further up in @resume_kernel_mode.

So what do we gain:

* Shaves off a few insn in return path.

* Eliminates the need for IRQ_DISABLE_SAVE assembler macro for ARCv2
  hence allows for entry code sharing.

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>

1 files changed, 0 insertions, 7 deletions

diff --git a/arch/arc/include/asm/irqflags.h b/arch/arc/include/asm/irqflags.h
index d99f79bcf865..b68b53f458d1 100644
--- a/arch/arc/include/asm/irqflags.h
+++ b/arch/arc/include/asm/irqflags.h
@@ -157,13 +157,6 @@ static inline void arch_unmask_irq(unsigned int irq)
         flag    \scratch
 .endm
 
-.macro IRQ_DISABLE_SAVE  scratch, save
-        lr      \scratch, [status32]
-        mov     \save, \scratch         /* Make a copy */
-        bic     \scratch, \scratch, (STATUS_E1_MASK | STATUS_E2_MASK)
-        flag    \scratch
-.endm
-
 .macro IRQ_ENABLE  scratch
         lr      \scratch, [status32]
         or      \scratch, \scratch, (STATUS_E1_MASK | STATUS_E2_MASK)