Johannes Goetzfried
<[email protected]> writes:
> +
> +static int __init serpent_init(void)
> +{
> + u64 xcr0;
> +
> + if (!cpu_has_avx || !cpu_has_osxsave) {
> + printk(KERN_INFO "AVX instructions are not detected.\n");
> + return -ENODEV;
> + }
> +
> + xcr0 = xgetbv(XCR_XFEATURE_ENABLED_MASK);
> + if ((xcr0 & (XSTATE_SSE | XSTATE_YMM)) != (XSTATE_SSE | XSTATE_YMM)) {
> + printk(KERN_INFO "AVX detected but unusable.\n");
> + return -ENODEV;
> + }
> +
> + return crypto_register_algs(serpent_algs, ARRAY_SIZE(serpent_algs));
> +}
> +
> +static void __exit serpent_exit(void)
> +{
> + crypto_unregister_algs(serpent_algs, ARRAY_SIZE(serpent_algs));
> +}
> +
> +module_init(serpent_init);
> +module_exit(serpent_exit);
> +
> +MODULE_DESCRIPTION("Serpent Cipher Algorithm, AVX optimized");
> +MODULE_LICENSE("GPL");
> +MODULE_ALIAS("serpent");
The driver needs CPUID annotations now (since 3.3), so that it can be
autoloaded. Something like:
#include <asm/cpu_device_id.h>
static const struct x86_cpu_id avx_cpu_id[] = {
X86_FEATURE_MATCH(X86_FEATURE_AVX),
{}
};
MODULE_DEVICE_TABLE(x86cpu, avx_cpu_id);
Replace the manual check in init with
if (!x86_match_cpu(avx_cpu_id))
return -ENODEV;
Also drivers should never print anything when they cannot find hardware.
Remove that printk.
-Andi
--
[email protected] -- Speaking for myself only
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