On Tue, 16 Jun 2020 09:38:27 +0200 Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx> wrote: > On 2020-06-16 09:14:37 [+0200], Stephen Berman wrote: >> >> I set CONFIG_ACPI_DEBUG=y, applied the patch and rebuilt 5.6.4, but: >> >> $ cat /sys/kernel/debug/tracing/trace > trace.txt >> cat: /sys/kernel/debug/tracing/trace: No such file or directory >> >> Here are all the 5.6.4 config options with "TRACING" or "TRACE"; do I >> need to set any that aren't set? > > I see that "Kernel hacking ---> Tracers" is enabled. You should have > one tracer enabled for that trace_printk() to work. You have context > switch tracer so it should be enough. > > You might need CONFIG_DEBUG_FS (but it is set in your 5.1 config) or it > is just not mounted. So I have here: > > | debugfs on /sys/kernel/debug type debugfs (rw,nosuid,nodev,noexec,relatime) > | tracefs on /sys/kernel/debug/tracing type tracefs (rw,nosuid,nodev,noexec,relatime) > > Does it work for you if you mount it? # mount -t debugfs debugfs /sys/kernel/debug # mount -t tracefs tracefs /sys/kernel/debug/tracing # mount ... debugfs on /sys/kernel/debug type debugfs (rw,relatime) tracefs on /sys/kernel/debug/tracing type tracefs (rw,relatime) Yes, thanks, that did it. Trace attached. Steve Berman
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