Explain clearly why kmalloc() can't use __GFP_HIGHMEM.
Robert P. J. Day authored

Fix the wishy-washy comment to clearly explain why kmalloc() can't
use the __GFP_HIGHMEM zone modifier.
Signed-off-by: default avatarRobert P. J. Day <rpjday@mindspring.com>
Signed-off-by: default avatarAdrian Bunk <bunk@kernel.org>
8518609d