gs <bhutchings@solarflare.com> 1291676100 +0000
committer Ben Hutchings <bhutchings@solarflare.com> 1291676100 +0000

sfc: Expand/correct comments on collector behaviour and function usage

Document exactly which registers and functions have special behaviour,
and why races on writes to descriptor pointers are safe.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
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