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| author | Juergen Gross | 2022-06-02 15:05:26 +0200 |
|---|---|---|
| committer | Juergen Gross | 2022-06-06 08:06:00 +0200 |
| commit | 2130a790ca49763f724ec45cf93b9dd765e2023e (patch) | |
| tree | bcb5b510df4a6c9ab4d1f8dc1f4b0eb0831f7161 /kernel/platform-feature.c | |
| parent | f2906aa863381afb0015a9eb7fefad885d4e5a56 (diff) | |
kernel: add platform_has() infrastructure
Add a simple infrastructure for setting, resetting and querying
platform feature flags.
Flags can be either global or architecture specific.
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>
Tested-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com> # Arm64 only
Reviewed-by: Christoph Hellwig <hch@lst.de>
Acked-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Juergen Gross <jgross@suse.com>
Diffstat (limited to 'kernel/platform-feature.c')
| -rw-r--r-- | kernel/platform-feature.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/kernel/platform-feature.c b/kernel/platform-feature.c new file mode 100644 index 000000000000..cb6a6c3e4fed --- /dev/null +++ b/kernel/platform-feature.c @@ -0,0 +1,27 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include <linux/bitops.h> +#include <linux/cache.h> +#include <linux/export.h> +#include <linux/platform-feature.h> + +#define PLATFORM_FEAT_ARRAY_SZ BITS_TO_LONGS(PLATFORM_FEAT_N) +static unsigned long __read_mostly platform_features[PLATFORM_FEAT_ARRAY_SZ]; + +void platform_set(unsigned int feature) +{ + set_bit(feature, platform_features); +} +EXPORT_SYMBOL_GPL(platform_set); + +void platform_clear(unsigned int feature) +{ + clear_bit(feature, platform_features); +} +EXPORT_SYMBOL_GPL(platform_clear); + +bool platform_has(unsigned int feature) +{ + return test_bit(feature, platform_features); +} +EXPORT_SYMBOL_GPL(platform_has); |