[PATCH V3 00/29] bitops: add parity functions
From: zengzhaoxiu
Date: Thu Apr 14 2016 - 00:21:36 EST
From: Zhaoxiu Zeng <zhaoxiu.zeng@xxxxxxxxx>
When I do "grep parity -r linux", I found many parity calculations
distributed in many drivers.
This patch series does:
1. provide generic and architecture-specific parity calculations
2. remove drivers' local parity calculations, use bitops' parity
functions instead
3. replace "hweightN(x) & 1" with "parityN(x)" to improve readability,
and improve performance on some CPUs that without popcount support
I did not use GCC's __builtin_parity* functions, based on the following reasons:
1. I don't know where to identify which version of GCC from the beginning
supported __builtin_parity for the architecture.
2. For the architecture that doesn't has popcount instruction, GCC instead use
"call __paritysi2" (__paritydi2 for 64-bits). So if use __builtin_parity, we must
provide __paritysi2 and __paritydi2 functions for these architectures.
Additionally, parity4,8,16 might be "__builtin_parity(x & mask)", but the "& mask"
operation is totally unnecessary.
3. For the architecture that has popcount instruction, we do the same things.
4. For powerpc, sparc, and x86, we do runtime patching to use popcount instruction
if the CPU support.
I have compiled successfully with x86_64_defconfig, i386_defconfig, pseries_defconfig
and sparc64_defconfig.
Changes to v2:
- Add constant PARITY_MAGIC (proposals by Sam Ravnborg)
- Add include/asm-generic/bitops/popc-parity.h (proposals by Chris Metcalf)
- Tile uses popc-parity.h directly
- Mips uses popc-parity.h if has usable __builtin_popcount
- Add few comments in powerpc's and sparc's parity.S
- X86, remove custom calling convention
Changes to v1:
- Add runtime patching for powerpc, sparc, and x86
- Avr32 use grenric parity too
- Fix error in ssfdc's patch, and add commit message
- Don't change the original code composition of drivers/iio/gyro/adxrs450.c
- Directly assignement to phy_cap.parity in drivers/scsi/isci/phy.c
Regards,
=== diffstat ===
Zhaoxiu Zeng (29):
bitops: add parity functions
Include generic parity.h in some architectures' bitops.h
Add alpha-specific parity functions
Add blackfin-specific parity functions
Add ia64-specific parity functions
Tile and MIPS (if has usable __builtin_popcount) use popcount parity
functions
Add powerpc-specific parity functions
Add sparc-specific parity functions
Add x86-specific parity functions
sunrpc: use parity8
mips: use parity functions in cerr-sb1.c
bch: use parity32
media: use parity8 in vivid-vbi-gen.c
media: use parity functions in saa7115
input: use parity32 in grip_mp
input: use parity64 in sidewinder
input: use parity16 in ams_delta_serio
scsi: use parity32 in isci's phy
mtd: use parity16 in ssfdc
mtd: use parity functions in inftlcore
crypto: use parity functions in qat_hal
mtd: use parity16 in sm_ftl
ethernet: use parity8 in sun/niu.c
input: use parity8 in pcips2
input: use parity8 in sa1111ps2
iio: use parity32 in adxrs450
serial: use parity32 in max3100
input: use parity8 in elantech
ethernet: use parity8 in broadcom/tg3.c
arch/alpha/include/asm/bitops.h | 27 +++++
arch/arc/include/asm/bitops.h | 1 +
arch/arm/include/asm/bitops.h | 1 +
arch/arm64/include/asm/bitops.h | 1 +
arch/avr32/include/asm/bitops.h | 1 +
arch/blackfin/include/asm/bitops.h | 31 ++++++
arch/c6x/include/asm/bitops.h | 1 +
arch/cris/include/asm/bitops.h | 1 +
arch/frv/include/asm/bitops.h | 1 +
arch/h8300/include/asm/bitops.h | 1 +
arch/hexagon/include/asm/bitops.h | 1 +
arch/ia64/include/asm/bitops.h | 31 ++++++
arch/m32r/include/asm/bitops.h | 1 +
arch/m68k/include/asm/bitops.h | 1 +
arch/metag/include/asm/bitops.h | 1 +
arch/mips/include/asm/bitops.h | 7 ++
arch/mips/mm/cerr-sb1.c | 67 ++++---------
arch/mn10300/include/asm/bitops.h | 1 +
arch/openrisc/include/asm/bitops.h | 1 +
arch/parisc/include/asm/bitops.h | 1 +
arch/powerpc/include/asm/bitops.h | 11 +++
arch/powerpc/lib/Makefile | 2 +-
arch/powerpc/lib/parity_64.S | 142 +++++++++++++++++++++++++++
arch/powerpc/lib/ppc_ksyms.c | 5 +
arch/s390/include/asm/bitops.h | 1 +
arch/sh/include/asm/bitops.h | 1 +
arch/sparc/include/asm/bitops_32.h | 1 +
arch/sparc/include/asm/bitops_64.h | 18 ++++
arch/sparc/kernel/sparc_ksyms_64.c | 6 ++
arch/sparc/lib/Makefile | 2 +-
arch/sparc/lib/parity.S | 128 ++++++++++++++++++++++++
arch/tile/include/asm/bitops.h | 2 +
arch/x86/include/asm/arch_hweight.h | 5 +
arch/x86/include/asm/arch_parity.h | 117 ++++++++++++++++++++++
arch/x86/include/asm/bitops.h | 4 +-
arch/xtensa/include/asm/bitops.h | 1 +
drivers/crypto/qat/qat_common/qat_hal.c | 32 ++----
drivers/iio/gyro/adxrs450.c | 4 +-
drivers/input/joystick/grip_mp.c | 16 +--
drivers/input/joystick/sidewinder.c | 24 +----
drivers/input/mouse/elantech.c | 10 +-
drivers/input/mouse/elantech.h | 1 -
drivers/input/serio/ams_delta_serio.c | 8 +-
drivers/input/serio/pcips2.c | 2 +-
drivers/input/serio/sa1111ps2.c | 2 +-
drivers/media/i2c/saa7115.c | 17 +---
drivers/media/platform/vivid/vivid-vbi-gen.c | 9 +-
drivers/mtd/inftlcore.c | 17 +---
drivers/mtd/sm_ftl.c | 5 +-
drivers/mtd/ssfdc.c | 31 ++----
drivers/net/ethernet/broadcom/tg3.c | 6 +-
drivers/net/ethernet/sun/niu.c | 10 +-
drivers/scsi/isci/phy.c | 15 +--
drivers/tty/serial/max3100.c | 2 +-
include/asm-generic/bitops.h | 1 +
include/asm-generic/bitops/arch_parity.h | 39 ++++++++
include/asm-generic/bitops/const_parity.h | 36 +++++++
include/asm-generic/bitops/parity.h | 7 ++
include/asm-generic/bitops/popc-parity.h | 32 ++++++
include/linux/bitops.h | 10 ++
lib/bch.c | 14 +--
net/sunrpc/auth_gss/gss_krb5_keys.c | 6 +-
62 files changed, 745 insertions(+), 235 deletions(-)
create mode 100644 arch/powerpc/lib/parity_64.S
create mode 100644 arch/sparc/lib/parity.S
create mode 100644 arch/x86/include/asm/arch_parity.h
create mode 100644 include/asm-generic/bitops/arch_parity.h
create mode 100644 include/asm-generic/bitops/const_parity.h
create mode 100644 include/asm-generic/bitops/parity.h
create mode 100644 include/asm-generic/bitops/popc-parity.h
--
2.5.0
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