On Mon, 18 May 2015, Dave Hansen wrote: > From: Dave Hansen <[email protected]> > > The MPX code appears to be saving off the FPU in an unsafe > way. It does not disable preemption or ensure that the > FPU state has been allocated. All of the preemption safety > comes from the unfortunatley-named 'unlazy_fpu()'. > > This patch introduces a new helper which will do both of > those things internally. > > Note that this requires a patch from Oleg in order to work > properly. It is currently in tip/x86/fpu. > > > commit f893959b0898bd876673adbeb6798bdf25c034d7 > > Author: Oleg Nesterov <[email protected]> > > Date: Fri Mar 13 18:30:30 2015 +0100 > > > > x86/fpu: Don't abuse drop_init_fpu() in flush_thread() > > Signed-off-by: Dave Hansen <[email protected]> > Cc: Oleg Nesterov <[email protected]> > Cc: [email protected] > Cc: Rik van Riel <[email protected]> > Cc: Suresh Siddha <[email protected]> > Cc: Andy Lutomirski <[email protected]> > Cc: Thomas Gleixner <[email protected]> > Cc: Ingo Molnar <[email protected]> > Cc: "H. Peter Anvin" <[email protected]> > Cc: Fenghua Yu <[email protected]> > Cc: the arch/x86 maintainers <[email protected]>
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