mmiotrace uses the ftrace framework for dynamic patching, so enabling it does not cause any performance impact. Having mmiotrace enabled is very useful for debugging nvidia / nouveau driver problems, as we often use mmiotraces for nouveau development / debugging. Signed-off-by: Hans de Goede <hdegoede(a)redhat.com&gt; --- config-x86-generic | 1 + kernel.spec | 3 +++ 2 files changed, 4 insertions(+) diff --git a/config-x86-generic b/config-x86-generic index 9ba3354..eb78690 100644 --- a/config-x86-generic +++ b/config-x86-generic @@ -66,6 +66,7 @@ CONFIG_CAPI_EICON=y # CONFIG_X86_MPPARSE=y # CONFIG_X86_VERBOSE_BOOTUP is not set +CONFIG_MMIOTRACE=y # CONFIG_MMIOTRACE_TEST is not set # CONFIG_DEBUG_PER_CPU_MAPS is not set CONFIG_DEBUG_RODATA=y diff --git a/kernel.spec b/kernel.spec index 4ccceec..cdb59d4 100644 --- a/kernel.spec +++ b/kernel.spec @@ -2025,6 +2025,9 @@ fi # %changelog * Tue Aug 04 2015 Hans de Goede <hdegoede(a)redhat.com&gt; +- Always enable mmiotrace when building x86 kernels + +* Tue Aug 04 2015 Hans de Goede <hdegoede(a)redhat.com&gt; - Move joydev.ko from kernel-modules-extra to kernel-modules * Mon Aug 03 2015 Josh Boyer <jwboyer(a)fedoraproject.org&gt; -- 2.4.3