freebsd-dev/sys/i386
Konstantin Belousov 65f99c74fb Clear the kernel grab of the FPU state on fork. The pcb_save pointer
is already correctly reset to the FPU user save area, only PCB_KERNFPU
flag might leak from old thread state into the new state.

For creation of the user-mode thread, the change is nop since
corresponding syscall code does not use FPU.  On the other hand,
creation of a kernel thread forks from a thread selected arbitrary
from proc0, which might use FPU.

Reported and tested by:	Chris Torek <torek@torek.net>
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
2014-03-29 11:56:33 +00:00
..
acpica Consistently use round_page(x) rather than roundup(x, PAGE_SIZE). There is 2013-02-15 22:43:08 +00:00
bios This isn't functionally identical. In some cases a hint to disable 2012-10-22 13:06:09 +00:00
conf Rather than require a makeoptions DEBUG to get debug correct, 2014-03-25 22:08:31 +00:00
i386 Clear the kernel grab of the FPU state on fork. The pcb_save pointer 2014-03-29 11:56:33 +00:00
ibcs2 Update kernel inclusions of capability.h to use capsicum.h instead; some 2014-03-16 10:55:57 +00:00
include xen: use the same hypercall mechanism for XEN and XENHVM 2014-03-11 10:24:13 +00:00
isa Implement vector callback for PVHVM and unify event channel implementations 2013-08-29 19:52:18 +00:00
linux Update kernel inclusions of capability.h to use capsicum.h instead; some 2014-03-16 10:55:57 +00:00
pci Fix undefined behavior: (1 << 31) is not defined as 1 is an int and this 2013-11-30 22:17:27 +00:00
svr4 Change some movl's to mov's. Newer GAS no longer accept 'movl' instructions 2009-01-31 11:37:21 +00:00
xbox After r261980, the local ptr variable in xbox_init() is no longer used, 2014-02-16 22:48:36 +00:00
xen Rename global cnt to vm_cnt to avoid shadowing. 2014-03-22 10:26:09 +00:00
Makefile Delete duplicate tags entry I introduced in -r223901. 2011-07-15 17:27:26 +00:00