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author | Linus Torvalds <torvalds@linux-foundation.org> | 2022-06-10 19:57:11 +0300 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2022-06-10 19:57:11 +0300 |
commit | f2ecc964b9414a407828f9bef242b77483e95a6d (patch) | |
tree | 0a412c7cbbc46b10a54e28cef49da7b9cfddf92f /kernel/platform-feature.c | |
parent | 7d78b7ebdf7dac762c3807274182b7c582be7937 (diff) | |
parent | dbac14a5a05ff8e1ce7c0da0e1f520ce39ec62ea (diff) | |
download | linux-f2ecc964b9414a407828f9bef242b77483e95a6d.tar.xz |
Merge tag 'for-linus-5.19a-rc2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip
Pull xen updates from Juergen Gross:
- a small cleanup removing "export" of an __init function
- a small series adding a new infrastructure for platform flags
- a series adding generic virtio support for Xen guests (frontend side)
* tag 'for-linus-5.19a-rc2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
xen: unexport __init-annotated xen_xlate_map_ballooned_pages()
arm/xen: Assign xen-grant DMA ops for xen-grant DMA devices
xen/grant-dma-ops: Retrieve the ID of backend's domain for DT devices
xen/grant-dma-iommu: Introduce stub IOMMU driver
dt-bindings: Add xen,grant-dma IOMMU description for xen-grant DMA ops
xen/virtio: Enable restricted memory access using Xen grant mappings
xen/grant-dma-ops: Add option to restrict memory access under Xen
xen/grants: support allocating consecutive grants
arm/xen: Introduce xen_setup_dma_ops()
virtio: replace arch_has_restricted_virtio_memory_access()
kernel: add platform_has() infrastructure
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); |