dc6fbf6545
has proven to have a good effect when entering KDB by using a NMI, but it completely violates all the good rules about interrupts disabled while holding a spinlock in other occasions. This can be the cause of deadlocks on events where a normal IPI_STOP is expected. * Adds an new IPI called IPI_STOP_HARD on all the supported architectures. This IPI is responsible for sending a stop message among CPUs using a privileged channel when disponible. In other cases it just does match a normal IPI_STOP. Right now the IPI_STOP_HARD functionality uses a NMI on ia32 and amd64 architectures, while on the other has a normal IPI_STOP effect. It is responsibility of maintainers to eventually implement an hard stop when necessary and possible. * Use the new IPI facility in order to implement a new userend SMP kernel function called stop_cpus_hard(). That is specular to stop_cpu() but it does use the privileged channel for the stopping facility. * Let KDB use the newly introduced function stop_cpus_hard() and leave stop_cpus() for all the other cases * Disable interrupts on CPU0 when starting the process of APs suspension. * Style cleanup and comments adding This patch should fix the reboot/shutdown deadlocks many users are constantly reporting on mailing lists. Please don't forget to update your config file with the STOP_NMI option removal Reviewed by: jhb Tested by: pho, bz, rink Approved by: re (kib) |
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.. | ||
_bus.h | ||
_inttypes.h | ||
_limits.h | ||
_stdint.h | ||
_types.h | ||
altivec.h | ||
asm.h | ||
atomic.h | ||
bat.h | ||
bootinfo.h | ||
bus_dma.h | ||
bus.h | ||
clock.h | ||
cpu.h | ||
cpufunc.h | ||
db_machdep.h | ||
dbdma.h | ||
elf.h | ||
endian.h | ||
exec.h | ||
float.h | ||
floatingpoint.h | ||
fpu.h | ||
frame.h | ||
gdb_machdep.h | ||
hid.h | ||
ieee.h | ||
ieeefp.h | ||
in_cksum.h | ||
intr_machdep.h | ||
intr.h | ||
kdb.h | ||
limits.h | ||
md_var.h | ||
memdev.h | ||
metadata.h | ||
mmuvar.h | ||
mutex.h | ||
ocpbus.h | ||
ofw_machdep.h | ||
openpicreg.h | ||
openpicvar.h | ||
param.h | ||
pcb.h | ||
pcpu.h | ||
pio.h | ||
platform.h | ||
platformvar.h | ||
pmap.h | ||
pmc_mdep.h | ||
proc.h | ||
profile.h | ||
psl.h | ||
pte.h | ||
ptrace.h | ||
reg.h | ||
reloc.h | ||
resource.h | ||
runq.h | ||
sc_machdep.h | ||
setjmp.h | ||
sf_buf.h | ||
sigframe.h | ||
signal.h | ||
smp.h | ||
spr.h | ||
sr.h | ||
stack.h | ||
stdarg.h | ||
sysarch.h | ||
tlb.h | ||
trap_aim.h | ||
trap_booke.h | ||
trap.h | ||
ucontext.h | ||
varargs.h | ||
vm.h | ||
vmparam.h |