RE: [PATCH 09/29] kbuild: disallow multi-word in M= or KBUILD_EXTMOD

[David Laight]

From: Masahiro Yamada
> Sent: 17 May 2020 10:49
> $(firstword ...) in scripts/Makefile.modpost was added by commit
> 3f3fd3c05585 ("[PATCH] kbuild: allow multi-word $M in Makefile.modpost")
> to build multiple external module directories.
> 
> This feature has been broken for a while. Remove the bitrotten code, and
> stop parsing if M or KBUILD_EXTMOD contains multiple words.

ISTR that one of the kernel documentation files says that it is possible
to build multiple modules together in order to avoid 'faffing' with
exported symbol lists.

So the docs need updating to match.

	David

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