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| author | Russell King (Oracle) <rmk+kernel@armlinux.org.uk> | 2022-07-29 16:12:25 +0100 |
|---|---|---|
| committer | Russell King (Oracle) <rmk+kernel@armlinux.org.uk> | 2022-11-14 12:00:57 +0000 |
| commit | 7e0093870e6c550139a27d1780f54f1e8acc4978 (patch) | |
| tree | 860db05daf7ac7b38eee30020dbf4a6840635e39 /arch/arm/lib | |
| parent | 9fbed16c3f4f2bebff610ff1ebb756785dfde0be (diff) | |
| download | linux-stable-7e0093870e6c550139a27d1780f54f1e8acc4978.tar.gz linux-stable-7e0093870e6c550139a27d1780f54f1e8acc4978.tar.bz2 linux-stable-7e0093870e6c550139a27d1780f54f1e8acc4978.zip | |
ARM: findbit: document ARMv5 bit offset calculation
Document the ARMv5 bit offset calculation code.
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Diffstat (limited to 'arch/arm/lib')
| -rw-r--r-- | arch/arm/lib/findbit.S | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/arch/arm/lib/findbit.S b/arch/arm/lib/findbit.S index 7fd3600db8ef..4c584bc4704b 100644 --- a/arch/arm/lib/findbit.S +++ b/arch/arm/lib/findbit.S @@ -172,10 +172,10 @@ ENDPROC(_find_next_bit_be) .L_found: #if __LINUX_ARM_ARCH__ >= 5 rsb r0, r3, #0 - and r3, r3, r0 - clz r3, r3 - rsb r3, r3, #31 - add r0, r2, r3 + and r3, r3, r0 @ mask out lowest bit set + clz r3, r3 @ count high zero bits + rsb r3, r3, #31 @ offset of first set bit + add r0, r2, r3 @ add offset of first set bit #else tst r3, #0x0f addeq r2, r2, #4 |