Commit 7e009387 authored by Russell King (Oracle)'s avatar Russell King (Oracle)
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ARM: findbit: document ARMv5 bit offset calculation 



Document the ARMv5 bit offset calculation code.

Signed-off-by: default avatarRussell King (Oracle) <rmk+kernel@armlinux.org.uk>
parent 9fbed16c

arch/arm/lib/findbit.S

+4 −4
Original line number Diff line number Diff line
@@ -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