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- Fix a crash when having function tracing and function stack tracing on
the command line. The ftrace trampolines are created as executable and
read only. But the stack tracer tries to modify them with text_poke()
which expects all kernel text to still be writable at boot.
Keep the trampolines writable at boot, and convert them to read-only
with the rest of the kernel.
- A selftest was triggering in the ring buffer iterator code, that
is no longer valid with the update of keeping the ring buffer
writable while a iterator is reading. Just bail after three failed
attempts to get an event and remove the warning and disabling of the
ring buffer.
- While modifying the ring buffer code, decided to remove all the
unnecessary BUG() calls.
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Merge tag 'trace-v5.7-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace
Pull more tracing fixes from Steven Rostedt:
"Various tracing fixes:
- Fix a crash when having function tracing and function stack tracing
on the command line.
The ftrace trampolines are created as executable and read only. But
the stack tracer tries to modify them with text_poke() which
expects all kernel text to still be writable at boot. Keep the
trampolines writable at boot, and convert them to read-only with
the rest of the kernel.
- A selftest was triggering in the ring buffer iterator code, that is
no longer valid with the update of keeping the ring buffer writable
while a iterator is reading.
Just bail after three failed attempts to get an event and remove
the warning and disabling of the ring buffer.
- While modifying the ring buffer code, decided to remove all the
unnecessary BUG() calls"
* tag 'trace-v5.7-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
ring-buffer: Remove all BUG() calls
ring-buffer: Don't deactivate the ring buffer on failed iterator reads
x86/ftrace: Have ftrace trampolines turn read-only at the end of system boot up
f44d5c4890