[Bug nptl/16630] Use SYSENTER for pthread_cond_broadcast/signal() (i.e. fix "FIXME: Ingo" issue)

["cjones.bugs at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=16630

--- Comment #2 from Chris Jones <cjones.bugs at gmail dot com> ---
(In reply to Rich Felker from comment #1)
> Ideally this asm will be removed at some point; I think that would resolve
> this issue automatically.

Do you happen to know if that's filed already?  I'm curious what it would be
replaced with.

> 
> BTW, the idea of letting apps hook __kernel_vsyscall is a very bad one. In
> order to fix issue #12683, use of __kernel_vsyscall needs to be abandoned
> for cancellable syscalls. Treating such hooking as a supported usage would
> preclude fixing a serious open bug.

Oh, please don't let me give you the wrong idea; I'm not at all advocating for
official support of hooking __kernel_vsyscall.  What I do with
__kernel_vsyscall stays in the privacy of my home ;).  (Trust me, I don't want
to be touching it either.)  But please take this patch at face value.

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