new helpers: __save_altstack/__compat_save_altstack, switch x86 and um to those
authorAl Viro <viro@zeniv.linux.org.uk>
Tue, 20 Nov 2012 19:24:26 +0000 (14:24 -0500)
committerAl Viro <viro@zeniv.linux.org.uk>
Wed, 19 Dec 2012 23:07:41 +0000 (18:07 -0500)
note that they are relying on access_ok() already checked by caller.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

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