Revision bb143f814ea488769ca2e79e0b376139cb5f134b authored by Vineet Gupta on 23 February 2016, 06:25:16 UTC, committed by Vineet Gupta on 24 February 2016, 05:37:28 UTC
ARConnect/MCIP Inter-Core-Interrupt module can't send interrupt to local core. So use core intc capability to trigger software interrupt to self, using an unsued IRQ #21. This showed up as csd deadlock with LTP trace_sched on a dual core system. This test acts as scheduler fuzzer, triggering all sorts of schedulting activity. Trouble starts with IPI to self, which doesn't get delivered (effectively lost due to H/w capability), but the msg intended to be sent remain enqueued in per-cpu @ipi_data. All subsequent IPIs to this core from other cores get elided due to the IPI coalescing optimization in ipi_send_msg_one() where a pending msg implies an IPI already sent and assumes other core is yet to ack it. After the elided IPI, other core simply goes into csd_lock_wait() but never comes out as this core never sees the interrupt. Fixes STAR 9001008624 Cc: Peter Zijlstra <peterz@infradead.org> Cc: <stable@vger.kernel.org> [4.2] Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
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File | Mode | Size |
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Kconfig | -rw-r--r-- | 1.1 KB |
Makefile | -rw-r--r-- | 401 bytes |
addr.c | -rw-r--r-- | 4.2 KB |
addr.h | -rw-r--r-- | 2.8 KB |
bcast.c | -rw-r--r-- | 11.2 KB |
bcast.h | -rw-r--r-- | 3.2 KB |
bearer.c | -rw-r--r-- | 25.4 KB |
bearer.h | -rw-r--r-- | 8.3 KB |
core.c | -rw-r--r-- | 4.6 KB |
core.h | -rw-r--r-- | 4.3 KB |
discover.c | -rw-r--r-- | 10.2 KB |
discover.h | -rw-r--r-- | 2.3 KB |
eth_media.c | -rw-r--r-- | 3.6 KB |
ib_media.c | -rw-r--r-- | 3.6 KB |
link.c | -rw-r--r-- | 54.1 KB |
link.h | -rw-r--r-- | 6.1 KB |
msg.c | -rw-r--r-- | 16.9 KB |
msg.h | -rw-r--r-- | 19.7 KB |
name_distr.c | -rw-r--r-- | 10.4 KB |
name_distr.h | -rw-r--r-- | 3.2 KB |
name_table.c | -rw-r--r-- | 27.8 KB |
name_table.h | -rw-r--r-- | 5.0 KB |
net.c | -rw-r--r-- | 8.2 KB |
net.h | -rw-r--r-- | 2.1 KB |
netlink.c | -rw-r--r-- | 4.9 KB |
netlink.h | -rw-r--r-- | 2.1 KB |
netlink_compat.c | -rw-r--r-- | 30.6 KB |
node.c | -rw-r--r-- | 48.2 KB |
node.h | -rw-r--r-- | 3.5 KB |
server.c | -rw-r--r-- | 15.1 KB |
server.h | -rw-r--r-- | 3.6 KB |
socket.c | -rw-r--r-- | 72.1 KB |
socket.h | -rw-r--r-- | 2.6 KB |
subscr.c | -rw-r--r-- | 10.6 KB |
subscr.h | -rw-r--r-- | 3.4 KB |
sysctl.c | -rw-r--r-- | 2.5 KB |
udp_media.c | -rw-r--r-- | 12.6 KB |
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