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authorArd Biesheuvel <ard.biesheuvel@linaro.org>2014-02-08 13:34:09 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-02-18 12:38:37 -0800
commit67bad2fdb754dbef14596c0b5d28b3a12c8dfe84 (patch)
tree05c3cd5f809618319346f9642549460f95149f02 /drivers/base/Kconfig
parent91219a3b20325689eb80f7598cce2dc745db171d (diff)
downloadop-kernel-dev-67bad2fdb754dbef14596c0b5d28b3a12c8dfe84.zip
op-kernel-dev-67bad2fdb754dbef14596c0b5d28b3a12c8dfe84.tar.gz
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 <asm/cpufeature.h> 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 <ard.biesheuvel@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/base/Kconfig')
-rw-r--r--drivers/base/Kconfig8
1 files changed, 8 insertions, 0 deletions
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
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