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| author | Dave Airlie <airlied@redhat.com> | 2017-10-03 09:35:04 +1000 |
|---|---|---|
| committer | Dave Airlie <airlied@redhat.com> | 2017-10-03 09:35:04 +1000 |
| commit | ebec44a2456fbe5fe18aae88f6010f6878f0cb4a (patch) | |
| tree | 427734722bdf3e807333329f33a6dbd6e95ec747 /tools/include/asm-generic/hugetlb_encode.h | |
| parent | 659333de48268550b5f09fcd45f76459d737b946 (diff) | |
| parent | 9e66317d3c92ddaab330c125dfe9d06eee268aff (diff) | |
| download | linux-ebec44a2456fbe5fe18aae88f6010f6878f0cb4a.tar.gz linux-ebec44a2456fbe5fe18aae88f6010f6878f0cb4a.tar.bz2 linux-ebec44a2456fbe5fe18aae88f6010f6878f0cb4a.zip | |
BackMerge tag 'v4.14-rc3' into drm-next
Linux 4.14-rc3
Requested by Daniel for the tracing build fix in fixes.
Diffstat (limited to 'tools/include/asm-generic/hugetlb_encode.h')
| -rw-r--r-- | tools/include/asm-generic/hugetlb_encode.h | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/tools/include/asm-generic/hugetlb_encode.h b/tools/include/asm-generic/hugetlb_encode.h new file mode 100644 index 000000000000..e4732d3c2998 --- /dev/null +++ b/tools/include/asm-generic/hugetlb_encode.h @@ -0,0 +1,34 @@ +#ifndef _ASM_GENERIC_HUGETLB_ENCODE_H_ +#define _ASM_GENERIC_HUGETLB_ENCODE_H_ + +/* + * Several system calls take a flag to request "hugetlb" huge pages. + * Without further specification, these system calls will use the + * system's default huge page size. If a system supports multiple + * huge page sizes, the desired huge page size can be specified in + * bits [26:31] of the flag arguments. The value in these 6 bits + * will encode the log2 of the huge page size. + * + * The following definitions are associated with this huge page size + * encoding in flag arguments. System call specific header files + * that use this encoding should include this file. They can then + * provide definitions based on these with their own specific prefix. + * for example: + * #define MAP_HUGE_SHIFT HUGETLB_FLAG_ENCODE_SHIFT + */ + +#define HUGETLB_FLAG_ENCODE_SHIFT 26 +#define HUGETLB_FLAG_ENCODE_MASK 0x3f + +#define HUGETLB_FLAG_ENCODE_64KB (16 << HUGETLB_FLAG_ENCODE_SHIFT) +#define HUGETLB_FLAG_ENCODE_512KB (19 << HUGETLB_FLAG_ENCODE_SHIFT) +#define HUGETLB_FLAG_ENCODE_1MB (20 << HUGETLB_FLAG_ENCODE_SHIFT) +#define HUGETLB_FLAG_ENCODE_2MB (21 << HUGETLB_FLAG_ENCODE_SHIFT) +#define HUGETLB_FLAG_ENCODE_8MB (23 << HUGETLB_FLAG_ENCODE_SHIFT) +#define HUGETLB_FLAG_ENCODE_16MB (24 << HUGETLB_FLAG_ENCODE_SHIFT) +#define HUGETLB_FLAG_ENCODE_256MB (28 << HUGETLB_FLAG_ENCODE_SHIFT) +#define HUGETLB_FLAG_ENCODE_1GB (30 << HUGETLB_FLAG_ENCODE_SHIFT) +#define HUGETLB_FLAG_ENCODE_2GB (31 << HUGETLB_FLAG_ENCODE_SHIFT) +#define HUGETLB_FLAG_ENCODE_16GB (34 << HUGETLB_FLAG_ENCODE_SHIFT) + +#endif /* _ASM_GENERIC_HUGETLB_ENCODE_H_ */ |