### # build: Generic definitions # # Lots of this code have been borrowed or heavily inspired from parts # of kbuild code, which is not credited, but mostly developed by: # # Copyright (C) Sam Ravnborg , 2015 # Copyright (C) Linus Torvalds , 2015 # ### # Convenient variables comma := , squote := ' ### # Name of target with a '.' as filename prefix. foo/bar.o => foo/.bar.o dot-target = $(dir $@).$(notdir $@) ### # filename of target with directory and extension stripped basetarget = $(basename $(notdir $@)) ### # The temporary file to save gcc -MD generated dependencies must not # contain a comma depfile = $(subst $(comma),_,$(dot-target).d) ### # Check if both arguments has same arguments. Result is empty string if equal. arg-check = $(strip $(filter-out $(cmd_$(1)), $(cmd_$@)) \ $(filter-out $(cmd_$@), $(cmd_$(1))) ) ### # Escape single quote for use in echo statements escsq = $(subst $(squote),'\$(squote)',$1) # Echo command # Short version is used, if $(quiet) equals `quiet_', otherwise full one. echo-cmd = $(if $($(quiet)cmd_$(1)),\ echo ' $(call escsq,$($(quiet)cmd_$(1)))';) ### # Replace >$< with >$$< to preserve $ when reloading the .cmd file # (needed for make) # Replace >#< with >\#< to avoid starting a comment in the .cmd file # (needed for make) # Replace >'< with >'\''< to be able to enclose the whole string in '...' # (needed for the shell) make-cmd = $(call escsq,$(subst \#,\\\#,$(subst $$,$$$$,$(cmd_$(1))))) ### # Find any prerequisites that is newer than target or that does not exist. # PHONY targets skipped in both cases. any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^) ### # Copy dependency data into .cmd file # - gcc -M dependency info # - command line to create object 'cmd_object :=' dep-cmd = $(if $(wildcard $(fixdep)), \ $(fixdep) $(depfile) $@ '$(make-cmd)' > $(dot-target).tmp; \ rm -f $(depfile); \ mv -f $(dot-target).tmp $(dot-target).cmd, \ printf '\# cannot find fixdep (%s)\n' $(fixdep) > $(dot-target).cmd; \ printf '\# using basic dep data\n\n' >> $(dot-target).cmd; \ cat $(depfile) >> $(dot-target).cmd; \ printf '\n%s\n' 'cmd_$@ := $(make-cmd)' >> $(dot-target).cmd) ### # if_changed_dep - execute command if any prerequisite is newer than # target, or command line has changed and update # dependencies in the cmd file if_changed_dep = $(if $(strip $(any-prereq) $(arg-check)), \ @set -e; \ $(echo-cmd) $(cmd_$(1)) && $(dep-cmd)) # if_changed - execute command if any prerequisite is newer than # target, or command line has changed if_changed = $(if $(strip $(any-prereq) $(arg-check)), \ @set -e; \ $(echo-cmd) $(cmd_$(1)); \ printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd) ### # C flags to be used in rule definitions, includes: # - depfile generation # - global $(CFLAGS) # - per target C flags # - per object C flags # - BUILD_STR macro to allow '-D"$(variable)"' constructs c_flags_1 = -Wp,-MD,$(depfile) -Wp,-MT,$@ $(CFLAGS) -D"BUILD_STR(s)=\#s" $(CFLAGS_$(basetarget).o) $(CFLAGS_$(obj)) c_flags_2 = $(filter-out $(CFLAGS_REMOVE_$(basetarget).o), $(c_flags_1)) c_flags = $(filter-out $(CFLAGS_REMOVE_$(obj)), $(c_flags_2)) cxx_flags = -Wp,-MD,$(depfile) -Wp,-MT,$@ $(CXXFLAGS) -D"BUILD_STR(s)=\#s" $(CXXFLAGS_$(basetarget).o) $(CXXFLAGS_$(obj)) ### ## HOSTCC C flags host_c_flags = -Wp,-MD,$(depfile) -Wp,-MT,$@ $(CHOSTFLAGS) -D"BUILD_STR(s)=\#s" $(CHOSTFLAGS_$(basetarget).o) $(CHOSTFLAGS_$(obj)) e='3' selected='selected'>3space:mode:
authorSteven Rostedt (VMware) <rostedt@goodmis.org>2017-01-30 19:27:10 -0500
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2017-01-31 09:13:49 -0500
commit79c6f448c8b79c321e4a1f31f98194e4f6b6cae7 (patch)
tree370efda701f03cccf21e02bb1fdd3b852547d75c /drivers/usb/chipidea/bits.h
parent0c744ea4f77d72b3dcebb7a8f2684633ec79be88 (diff)
tracing: Fix hwlat kthread migration
The hwlat tracer creates a kernel thread at start of the tracer. It is pinned to a single CPU and will move to the next CPU after each period of running. If the user modifies the migration thread's affinity, it will not change after that happens. The original code created the thread at the first instance it was called, but later was changed to destroy the thread after the tracer was finished, and would not be created until the next instance of the tracer was established. The code that initialized the affinity was only called on the initial instantiation of the tracer. After that, it was not initialized, and the previous affinity did not match the current newly created one, making it appear that the user modified the thread's affinity when it did not, and the thread failed to migrate again. Cc: stable@vger.kernel.org Fixes: 0330f7aa8ee6 ("tracing: Have hwlat trace migrate across tracing_cpumask CPUs") Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'drivers/usb/chipidea/bits.h')