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ARM: findbit: document ARMv5 bit offset calculation

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Document the ARMv5 bit offset calculation code.

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
This commit is contained in:
Russell King (Oracle) 2022-07-29 16:12:25 +01:00
parent 9fbed16c3f
commit 7e0093870e
1 changed files with 4 additions and 4 deletions
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8
arch/arm/lib/findbit.S
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@ -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