From: Al Viro <viro@ftp.linux.org.uk>
Date: Thu, 18 Aug 2011 19:00:49 +0000 (+0100)
Subject: um: series of __get_user() is costly in sigframe handling
X-Git-Tag: v3.2-rc1~87^2~85
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a955bd611d6426bf7b61cab01f8ddee9cc169736;p=pandora-kernel.git

um: series of __get_user() is costly in sigframe handling

It's not x86, where __get_user() is a single dereference; here it's
a single ptrace(2) call in host, which obviously costs a lot more.
IOW, it's cheaper to do copy_{to,from}_user() once than bother with
fields one by one...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Richard Weinberger <richard@nod.at>
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