On Thu, Oct 18, 2018 at 05:57:56PM +0100, Robin Murphy wrote: > On 18/10/18 17:25, Du Changbin wrote: > > From: Changbin Du <changbin.du@xxxxxxxxx> > > > > This patch add a new kernel hacking option NO_AUTO_INLINE. Selecting > > this option will prevent the compiler from optimizing the kernel by > > auto-inlining functions not marked with the inline keyword. > > > > With this option, only functions explicitly marked with "inline" will > > be inlined. This will allow the function tracer to trace more functions > > because it only traces functions that the compiler has not inlined. > > > > Signed-off-by: Changbin Du <changbin.du@xxxxxxxxx> > > Acked-by: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx> > > --- > > Makefile | 6 ++++++ > > lib/Kconfig.debug | 25 +++++++++++++++++++++++++ > > 2 files changed, 31 insertions(+) > > > > diff --git a/Makefile b/Makefile > > index e8b599b4dcde..757d6507cb5c 100644 > > --- a/Makefile > > +++ b/Makefile > > @@ -749,6 +749,12 @@ KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ > > $(call cc-option,-fno-var-tracking) > > endif > > +ifdef CONFIG_NO_AUTO_INLINE > > +KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions) \ > > + $(call cc-option, -fno-inline-small-functions) \ > > + $(call cc-option, -fno-inline-functions-called-once) > > +endif > > + > > ifdef CONFIG_FUNCTION_TRACER > > ifdef CONFIG_FTRACE_MCOUNT_RECORD > > # gcc 5 supports generating the mcount tables directly > > diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug > > index 4966c4fbe7f7..0f9b4fa78b1c 100644 > > --- a/lib/Kconfig.debug > > +++ b/lib/Kconfig.debug > > @@ -211,6 +211,31 @@ config GDB_SCRIPTS > > instance. See Documentation/dev-tools/gdb-kernel-debugging.rst > > for further details. > > +config NO_AUTO_INLINE > > + bool "Disable compiler auto-inline optimizations" > > + help > > + This will prevent the compiler from optimizing the kernel by > > + auto-inlining functions not marked with the inline keyword. > > + With this option, only functions explicitly marked with > > + "inline" will be inlined. This will allow the function tracer > > + to trace more functions because it only traces functions that > > + the compiler has not inlined. > > + > > + Enabling this function can help debugging a kernel if using > > + the function tracer. But it can also change how the kernel > > + works, because inlining functions may change the timing, > > + which could make it difficult while debugging race conditions. > > + > > + If unsure, select N. > > + > > +config ENABLE_WARN_DEPRECATED > > This part doesn't look like it belongs in this patch, and judging by the > commit message in 771c035372a0 wouldn't be welcome back anyway. > opps, this is a rebasing mistake. Let me update it. Thanks. > Robin. > > > + bool "Enable __deprecated logic" > > + default y > > + help > > + Enable the __deprecated logic in the kernel build. > > + Disable this to suppress the "warning: 'foo' is deprecated > > + (declared at kernel/power/somefile.c:1234)" messages. > > + > > config ENABLE_MUST_CHECK > > bool "Enable __must_check logic" > > default y > > -- Thanks, Du Changbin
