This is a note to let you know that I've just added the patch titled
ARC: bitops: Remove non relevant comments
to the 4.5-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
arc-bitops-remove-non-relevant-comments.patch
and it can be found in the queue-4.5 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 2a41b6dc28dc71c1a3f1622612a26edc58f7561e Mon Sep 17 00:00:00 2001
From: Vineet Gupta <vgupta@xxxxxxxxxxxx>
Date: Tue, 8 Mar 2016 19:31:24 +0530
Subject: ARC: bitops: Remove non relevant comments
From: Vineet Gupta <vgupta@xxxxxxxxxxxx>
commit 2a41b6dc28dc71c1a3f1622612a26edc58f7561e upstream.
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@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/arc/include/asm/bitops.h | 15 ---------------
1 file changed, 15 deletions(-)
--- a/arch/arc/include/asm/bitops.h
+++ b/arch/arc/include/asm/bitops.h
@@ -35,21 +35,6 @@ static inline void op##_bit(unsigned lon
\
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__( \
Patches currently in stable-queue which might be from vgupta@xxxxxxxxxxxx are
queue-4.5/arc-readl-writel-to-work-in-big-endian-cpu-configuration.patch
queue-4.5/arc-bitops-remove-non-relevant-comments.patch
queue-4.5/arc-add-ethernet-phy-description-in-.dts.patch
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