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authorJ. Bruce Fields <bfields@redhat.com>2015-10-09 04:44:07 +0300
committerJ. Bruce Fields <bfields@redhat.com>2015-11-11 01:02:47 +0300
commit0442f14b15f8e7a8b3778a9f8cf640ef89b2df26 (patch)
treedd7cae613d5d154bd945b9c140d4764074bbbe08 /include/linux/sunrpc
parent7fc0564e3a8d16df096f48c9c6425ba84d945c6e (diff)
downloadlinux-0442f14b15f8e7a8b3778a9f8cf640ef89b2df26.tar.xz
svcrpc: document lack of some memory barriers
We're missing memory barriers in net/sunrpc/svcsock.c in some spots we'd expect them. But it doesn't appear they're necessary in our case, and this is likely a hot path--for now just document the odd behavior. Kosuke Tatsukawa found this issue while looking through the linux source code for places calling waitqueue_active() before wake_up*(), but without preceding memory barriers, after sending a patch to fix a similar issue in drivers/tty/n_tty.c (Details about the original issue can be found here: https://lkml.org/lkml/2015/9/28/849). Reported-by: Kosuke Tatsukawa <tatsu@ab.jp.nec.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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