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Date: Tue, 29 Sep 2020 20:12:57 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: Sami Tolvanen <samitolvanen@...gle.com>
Cc: Masahiro Yamada <masahiroy@...nel.org>, Will Deacon <will@...nel.org>,
Peter Zijlstra <peterz@...radead.org>, Greg Kroah-Hartman
<gregkh@...uxfoundation.org>, "Paul E. McKenney" <paulmck@...nel.org>, Kees
Cook <keescook@...omium.org>, Nick Desaulniers <ndesaulniers@...gle.com>,
clang-built-linux@...glegroups.com, kernel-hardening@...ts.openwall.com,
linux-arch@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-pci@...r.kernel.org, x86@...nel.org
Subject: Re: [PATCH v4 06/29] tracing: move function tracer options to
Kconfig
On Tue, 29 Sep 2020 14:46:08 -0700
Sami Tolvanen <samitolvanen@...gle.com> wrote:
> +++ b/kernel/trace/Kconfig
> @@ -595,6 +595,22 @@ config FTRACE_MCOUNT_RECORD
> depends on DYNAMIC_FTRACE
> depends on HAVE_FTRACE_MCOUNT_RECORD
>
> +config FTRACE_MCOUNT_USE_PATCHABLE_FUNCTION_ENTRY
> + bool
> + depends on FTRACE_MCOUNT_RECORD
> +
> +config FTRACE_MCOUNT_USE_CC
> + def_bool y
> + depends on $(cc-option,-mrecord-mcount)
Does the above get executed at every build? Or does a make *config need
to be done? If someone were to pass a .config to someone else that had
a compiler that didn't support this, would it be changed if the person
just did a make?
-- Steve
> + depends on !FTRACE_MCOUNT_USE_PATCHABLE_FUNCTION_ENTRY
> + depends on FTRACE_MCOUNT_RECORD
> +
> +config FTRACE_MCOUNT_USE_RECORDMCOUNT
> + def_bool y
> + depends on !FTRACE_MCOUNT_USE_PATCHABLE_FUNCTION_ENTRY
> + depends on !FTRACE_MCOUNT_USE_CC
> + depends on FTRACE_MCOUNT_RECORD
> +
> config TRACING_MAP
> bool
> depends on ARCH_HAVE_NMI_SAFE_CMPXCHG
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