#!/bin/bash # # Here's how to use this: # # This script is used to help find functions that are being traced by function # tracer or function graph tracing that causes the machine to reboot, hang, or # crash. Here's the steps to take. # # First, determine if function tracing is working with a single function: # # (note, if this is a problem with function_graph tracing, then simply # replace "function" with "function_graph" in the following steps). # # # cd /sys/kernel/debug/tracing # # echo schedule > set_ftrace_filter # # echo function > current_tracer # # If this works, then we know that something is being traced that shouldn't be. # # # echo nop > current_tracer # # # cat available_filter_functions > ~/full-file # # ftrace-bisect ~/full-file ~/test-file ~/non-test-file # # cat ~/test-file > set_ftrace_filter # # *** Note *** this will take several minutes. Setting multiple functions is # an O(n^2) operation, and we are dealing with thousands of functions. So go # have coffee, talk with your coworkers, read facebook. And eventually, this # operation will end. # # # echo function > current_tracer # # If it crashes, we know that ~/test-file has a bad function. # # Reboot back to test kernel. # # # cd /sys/kernel/debug/tracing # # mv ~/test-file ~/full-file # # If it didn't crash. # # # echo nop > current_tracer # # mv ~/non-test-file ~/full-file # # Get rid of the other test file from previous run (or save them off somewhere). # # rm -f ~/test-file ~/non-test-file # # And start again: # # # ftrace-bisect ~/full-file ~/test-file ~/non-test-file # # The good thing is, because this cuts the number of functions in ~/test-file # by half, the cat of it into set_ftrace_filter takes half as long each # iteration, so don't talk so much at the water cooler the second time. # # Eventually, if you did this correctly, you will get down to the problem # function, and all we need to do is to notrace it. # # The way to figure out if the problem function is bad, just do: # # # echo > set_ftrace_notrace # # echo > set_ftrace_filter # # echo function > current_tracer # # And if it doesn't crash, we are done. # # If it does crash, do this again (there's more than one problem function) # but you need to echo the problem function(s) into set_ftrace_notrace before # enabling function tracing in the above steps. Or if you can compile the # kernel, annotate the problem functions with "notrace" and start again. # if [ $# -ne 3 ]; then echo 'usage: ftrace-bisect full-file test-file non-test-file' exit fi full=$1 test=$2 nontest=$3 x=`cat $full | wc -l` if [ $x -eq 1 ]; then echo "There's only one function left, must be the bad one" cat $full exit 0 fi let x=$x/2 let y=$x+1 if [ ! -f $full ]; then echo "$full does not exist" exit 1 fi if [ -f $test ]; then echo -n "$test exists, delete it? [y/N]" read a if [ "$a" != "y" -a "$a" != "Y" ]; then exit 1 fi fi if [ -f $nontest ]; then echo -n "$nontest exists, delete it? [y/N]" read a if [ "$a" != "y" -a "$a" != "Y" ]; then exit 1 fi fi sed -ne "1,${x}p" $full > $test sed -ne "$y,\$p" $full > $nontest cgi/linux/net-next.git/commit/sound/soc/intel?id=4d191b1b63c209e37bf27938ef365244d3c41084'>intel/boards/skl_nau88l25_max98357a.c
diff options
context:
space:
mode:
authorMarc Zyngier <marc.zyngier@arm.com>2017-01-17 14:21:56 +0000
committerBjorn Helgaas <bhelgaas@google.com>2017-01-17 08:41:51 -0600
commit4d191b1b63c209e37bf27938ef365244d3c41084 (patch)
treef2ab6cdb65ddacdf2e7c019cd55e353f0c16b400 /sound/soc/intel/boards/skl_nau88l25_max98357a.c
parent51ebfc92b72b4f7dac1ab45683bf56741e454b8c (diff)
PCI/MSI: pci-xgene-msi: Fix CPU hotplug registration handling
The conversion to the new hotplug state machine introduced a regression where a successful hotplug registration would be treated as an error, effectively disabling the MSI driver forever. Fix it by doing the proper check on the return value. Fixes: 9c248f8896e6 ("PCI/xgene-msi: Convert to hotplug state machine") Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Acked-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Tested-by: Duc Dang <dhdang@apm.com> CC: Thomas Gleixner <tglx@linutronix.de> CC: stable@vger.kernel.org
Diffstat (limited to 'sound/soc/intel/boards/skl_nau88l25_max98357a.c')