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linux-stable/arch/powerpc
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Cédric Le Goater cbc06f051c powerpc/xive: Do not skip CPU-less nodes when creating the IPIs 
On PowerVM, CPU-less nodes can be populated with hot-plugged CPUs at
runtime. Today, the IPI is not created for such nodes, and hot-plugged
CPUs use a bogus IPI, which leads to soft lockups.

We can not directly allocate and request the IPI on demand because
bringup_up() is called under the IRQ sparse lock. The alternative is
to allocate the IPIs for all possible nodes at startup and to request
the mapping on demand when the first CPU of a node is brought up.

Fixes: 7dcc37b3ef ("powerpc/xive: Map one IPI interrupt per node")
Cc: stable@vger.kernel.org # v5.13
Reported-by: Geetika Moolchandani <Geetika.Moolchandani1@ibm.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Tested-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Tested-by: Laurent Vivier <lvivier@redhat.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210807072057.184698-1-clg@kaod.org
2021-08-12 22:31:41 +10:00
..
boot powerpc updates for 5.14 2021-07-02 12:54:34 -07:00
configs TTY / Serial patches for 5.14-rc1 2021-07-05 14:08:24 -07:00
crypto crypto: powepc/sha1 - remove unneeded semicolon 2021-03-07 15:13:14 +11:00
include powerpc/interrupt: Fix OOPS by not calling do_IRQ() from timer_interrupt() 2021-08-12 22:21:57 +10:00
kernel powerpc/interrupt: Do not call single_step_exception() from other exceptions 2021-08-12 22:22:57 +10:00
kexec powerpc updates for 5.14 2021-07-02 12:54:34 -07:00
kvm KVM: PPC: Book3S HV Nested: Sanitise H_ENTER_NESTED TM state 2021-07-23 16:19:38 +10:00
lib powerpc: Only build restart_table.c for 64s 2021-07-01 22:50:54 +10:00
math-emu powerpc/64s: avoid reloading (H)SRR registers if they are still valid 2021-06-25 00:06:55 +10:00
mm powerpc fixes for 5.14 #2 2021-07-09 10:26:52 -07:00
net powerpc/bpf: Reject atomic ops in ppc32 JIT 2021-07-05 22:23:25 +10:00
perf powerpc updates for 5.14 2021-07-02 12:54:34 -07:00
platforms powerpc/pseries: Fix update of LPAR security flavor after LPM 2021-08-07 08:53:59 +10:00
purgatory powerpc/kexec: Don't use .machine ppc64 in trampoline_64.S 2021-04-08 21:17:43 +10:00
sysdev powerpc/xive: Do not skip CPU-less nodes when creating the IPIs 2021-08-12 22:31:41 +10:00
tools
xmon powerpc updates for 5.14 2021-07-02 12:54:34 -07:00
Kbuild
Kconfig powerpc updates for 5.14 2021-07-02 12:54:34 -07:00
Kconfig.debug powerpc: Make PPC_IRQ_SOFT_MASK_DEBUG depend on PPC64 2021-06-25 00:07:09 +10:00
Makefile Kbuild updates for v5.14 2021-07-10 11:01:38 -07:00
Makefile.postlink