Ingo van Lil fbfe9c847e um: Save FPU registers between task switches ... Some time ago Jeff prepared 42daba3165 ("uml: stop saving process FP state") for UML to stop saving the process FP state between task switches. The assumption was that since with SKAS0 every guest process runs inside a host process context the host OS will take care of keeping the proper FP state. Unfortunately this is not true for multi-threaded applications, where all guest threads share a single host process context yet all may use the FPU on their own. Although I haven't verified it I suspect things to be even worse in SKAS3 mode where all guest processes run inside a single host process. The patch reintroduces the saving and restoring of the FP context between task switches. [richard@nod.at: Ingo posted this patch in 2009, sadly it was never applied and got lost. Now in 2011 the problem was reported by Gunnar.] Signed-off-by: Ingo van Lil <inguin@gmx.de> Signed-off-by: Richard Weinberger <richard@nod.at> Reported-by: <gunnarlindroth@hotmail.com> Tested-by: <gunnarlindroth@hotmail.com> Cc: Stanislav Meduna <stano@meduna.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2011-09-14 18:09:37 -07:00
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archsetjmp.h
barrier.h
checksum.h	uml: remove useless comments	2009-04-01 08:59:17 -07:00
faultinfo.h
host_ldt.h
kernel-offsets.h
ptrace_user.h
ptrace.h	um: Save FPU registers between task switches	2011-09-14 18:09:37 -07:00
sc.h
sigcontext.h
skas_ptrace.h
stub.h	x86, um: get rid of excessive includes of uml-config.h	2008-10-22 22:55:22 -07:00
syscalls.h	Add generic sys_old_mmap()	2010-03-12 15:52:32 -08:00
system.h
tls.h
vm-flags.h