From 67bad2fdb754dbef14596c0b5d28b3a12c8dfe84 Mon Sep 17 00:00:00 2001 From: Ard Biesheuvel Date: Sat, 8 Feb 2014 13:34:09 +0100 Subject: cpu: add generic support for CPU feature based module autoloading This patch adds support for advertising optional CPU features over udev using the modalias, and for declaring compatibility with/dependency upon such a feature in a module. The mapping between feature numbers and actual features should be provided by the architecture in a file called which exports the following functions/macros: - cpu_feature(FEAT), a preprocessor macro that maps token FEAT to a numeric index; - bool cpu_have_feature(n), returning whether this CPU has support for feature #n; - MAX_CPU_FEATURES, an upper bound for 'n' in the previous function. The feature can then be enabled by setting CONFIG_GENERIC_CPU_AUTOPROBE for the architecture. For instance, a module that registers its module init function using module_cpu_feature_match(FEAT_X, module_init_function) will be probed automatically when the CPU's support for the 'FEAT_X' feature is advertised over udev, and will only allow the module to be loaded by hand if the 'FEAT_X' feature is supported. Signed-off-by: Ard Biesheuvel Signed-off-by: Greg Kroah-Hartman --- drivers/base/Kconfig | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'drivers/base/Kconfig') diff --git a/drivers/base/Kconfig b/drivers/base/Kconfig index ec36e77..3f0d373 100644 --- a/drivers/base/Kconfig +++ b/drivers/base/Kconfig @@ -185,6 +185,14 @@ config GENERIC_CPU_DEVICES bool default n +config HAVE_CPU_AUTOPROBE + def_bool ARCH_HAS_CPU_AUTOPROBE + +config GENERIC_CPU_AUTOPROBE + bool + depends on !ARCH_HAS_CPU_AUTOPROBE + select HAVE_CPU_AUTOPROBE + config SOC_BUS bool -- cgit v1.1