From: Ard Biesheuvel Date: Sat, 8 Feb 2014 12:34:09 +0000 (+0100) Subject: cpu: add generic support for CPU feature based module autoloading X-Git-Tag: v3.15-rc1~140^2~8 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=67bad2fdb754dbef14596c0b5d28b3a12c8dfe84;p=pandora-kernel.git 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 --- Reading git-diff-tree failed