linux-kernel - [PATCH 0/2] uapi: Refactor __GENMASK() and __GENMASK

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Message-ID: <20250211162412.477655-1-richard120310@gmail.com>
Date: Wed, 12 Feb 2025 00:24:10 +0800
From: I Hsin Cheng <richard120310@...il.com>
To: yury.norov@...il.com
Cc: anshuman.khandual@....com,
	arnd@...db.de,
	linux-kernel@...r.kernel.org,
	jserv@...s.ncku.edu.tw,
	skhan@...uxfoundation.org,
	I Hsin Cheng <richard120310@...il.com>
Subject: [PATCH 0/2] uapi: Refactor __GENMASK() and __GENMASK_ULL() for

This patch series refactor the implementation of the macros
__GENMASK() and __GENMASK_ULL() in order to speed up the operation by
reducing the number of instructions.

All the changes pass the unit tests and have used bloat-o-meter to test
the size shrink for vmlinux. Performance tests comparison are list in
each patches.

$ ./scripts/bloat-o-meter vmlinux_old vmlinux_new 
add/remove: 0/2 grow/shrink: 46/510 up/down: 464/-1733 (-1269)
...
Total: Before=22438085, After=22436816, chg -0.01%

Patch 1:
	Refactor __GENMASK()
Patch 2:
	Refactor __GENMASK_ULL()

I Hsin Cheng (2):
  uapi: Refactor __GENMASK() for speed-up
  uapi: Refactor __GENMASK_ULL() for speed-up

 include/uapi/linux/bits.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

-- 
2.43.0