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Merge tag 'v5.4.231' of git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable into odroid-5.4.y

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This is the 5.4.231 stable release

Change-Id: I4e4a5fd46b6c6c9f9b424c2b0a23d98a06e7ccfd
This commit is contained in:
Mauro (mdrjr) Ribeiro
2023-03-16 12:51:59 -03:00
parent fe6410d314 59342376e8
commit ad4e1dfd5c
176 changed files with 1187 additions and 536 deletions
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34
scripts/tracing/ftrace-bisect.sh
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@@ -12,7 +12,7 @@
# (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
# # cd /sys/kernel/tracing
# # echo schedule > set_ftrace_filter
# # echo function > current_tracer
#
@@ -20,22 +20,40 @@
#
# # echo nop > current_tracer
#
# # cat available_filter_functions > ~/full-file
# Starting with v5.1 this can be done with numbers, making it much faster:
#
# The old (slow) way, for kernels before v5.1.
#
# [old-way] # cat available_filter_functions > ~/full-file
#
# [old-way] *** Note *** this process will take several minutes to update the
# [old-way] filters. Setting multiple functions is an O(n^2) operation, and we
# [old-way] are dealing with thousands of functions. So go have coffee, talk
# [old-way] with your coworkers, read facebook. And eventually, this operation
# [old-way] will end.
#
# The new way (using numbers) is an O(n) operation, and usually takes less than a second.
#
# seq `wc -l available_filter_functions | cut -d' ' -f1` > ~/full-file
#
# This will create a sequence of numbers that match the functions in
# available_filter_functions, and when echoing in a number into the
# set_ftrace_filter file, it will enable the corresponding function in
# O(1) time. Making enabling all functions O(n) where n is the number of
# functions to enable.
#
# For either the new or old way, the rest of the operations remain the same.
#
# # 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
# # cd /sys/kernel/tracing
# # mv ~/test-file ~/full-file
#
# If it didn't crash.