Add a comment explaining the value of the ISSTATIC parameter, Inform the
reader that this is not a coding style issue.

Link: https://lkml.kernel.org/r/1613964695-17614-1-git-send-email-daizhiyuan@phytium.com.cnSigned-off-by: Zhiyuan Dai <daizhiyuan@phytium.com.cn>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>