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If a raid0 has a component device larger than 4TB, and is accessed on a 32bit
machines, then as 'chunk' is unsigned long,
chunk << chunksize_bits
can overflow (this can be as high as the size of the device in KB). chunk
itself will not overflow (without triggering a BUG).
So change 'chunk' to be 'sector_t, and get rid of the 'BUG' as it becomes
impossible to hit.
Cc: "Jeff Zheng" <Jeff.Zheng@endace.com>
Signed-off-by: Neil Brown <neilb@suse.de>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
787f17feb2