NetBSD / src / 4dVfXzw / Disable preemption when setting PCB_COMPAT32, to prevent a context switch

NetBSD/src 4dVfXzw — sys/arch/amd64/amd64 netbsd32_machdep.c machdep.c, sys/compat/linux32/arch/amd64 linux32_machdep.c

2019-03-24 15:58:32 UTC by maxv on ⎇

HEAD

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isaki-audio2-base

   Disable preemption when setting PCB_COMPAT32, to prevent a context switch
   before cpu_fsgs_reload() finishes, otherwise we write garbage in the GDT.
   On NetBSD-current it is harmless, however in NetBSD-8 it might cause
   panics, because NetBSD-8 uses the old SegRegs model and under this model
   we reload %fs and %gs during switches.

Version	Delta		File
1.120	+9	-8	sys/arch/amd64/amd64/netbsd32_machdep.c
1.44	+8	-6	sys/compat/linux32/arch/amd64/linux32_machdep.c
1.329	+3	-4	sys/arch/amd64/amd64/machdep.c
	+20	-18	3 files

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