Messages in this thread | | | Date | Wed, 29 Nov 2006 01:39:22 -0800 | From | Andrew Morton <> | Subject | Re: Boot failure with ext2 and initrds |
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On Wed, 29 Nov 2006 09:20:24 +0000 Russell King <rmk+lkml@arm.linux.org.uk> wrote:
> What I'm looking for is confirmation of the semantics of > find_next_zero_bit()
What are the existing semantics? I see no documentation in any of the architectures I've looked at. That's my point.
From a quick read of fs/ext2/balloc.c
ext2_find_next_zero_bit(base, size, offset)
appears to expect that base is the start of the memory buffer, size is the number of bits at *base and offset is the bit at which to start the search, relative to base. If a zero bit is found it will return the offset of that bit relative to base. It will return some number greater than `size' if no zero-bit was found.
Whether that's how all the implementors interpreted it is anyone's guess. Presumably the architectures all do roughly the same thing.
> <extremely frustrated>
Well likewise. It appears that nobody (and about 20 people have implemented these things) could be bothered getting off ass and documenting the pathetic thing.
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