ARC: bitops: Remove non relevant comments

commit 80f420842ff42 removed the ARC bitops microoptimization but failed
to prune the comments to same effect

Fixes: 80f420842ff42 ("ARC: Make ARC bitops "safer" (add anti-optimization)")
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>

diff --git a/arch/arc/include/asm/bitops.h b/arch/arc/include/asm/bitops.h
index 57c1f33844d44f1f9d16ed448ce0b13e87b88cea..0352fb8d21b998223b03e2bc327c3f4554df6ec5 100644 (file)
--- a/arch/arc/include/asm/bitops.h
+++ b/arch/arc/include/asm/bitops.h
@@ -35,21 +35,6 @@ static inline void op##_bit(unsigned long nr, volatile unsigned long *m)\
                                                                        \
        m += nr >> 5;                                                   \
                                                                        \
-       /*                                                              \
-        * ARC ISA micro-optimization:                                  \
-        *                                                              \
-        * Instructions dealing with bitpos only consider lower 5 bits  \
-        * e.g (x << 33) is handled like (x << 1) by ASL instruction    \
-        *  (mem pointer still needs adjustment to point to next word)  \
-        *                                                              \
-        * Hence the masking to clamp @nr arg can be elided in general. \
-        *                                                              \
-        * However if @nr is a constant (above assumed in a register),  \
-        * and greater than 31, gcc can optimize away (x << 33) to 0,   \
-        * as overflow, given the 32-bit ISA. Thus masking needs to be  \
-        * done for const @nr, but no code is generated due to gcc      \
-        * const prop.                                                  \
-        */                                                             \
        nr &= 0x1f;                                                     \
                                                                        \
        __asm__ __volatile__(                                           \