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| author | Sean Paul <seanpaul@chromium.org> | 2018-08-27 10:00:03 -0400 |
|---|---|---|
| committer | Sean Paul <seanpaul@chromium.org> | 2018-08-27 10:00:03 -0400 |
| commit | bc537a9cc47eec7f4e32b8164c494ddc35dca8ac (patch) | |
| tree | a7365f3b76f4e472c43f14e074a284bfb28803e8 /include/linux/bits.h | |
| parent | a5ec8332d4280500544e316f76c04a7adc02ce03 (diff) | |
| parent | 5b394b2ddf0347bef56e50c69a58773c94343ff3 (diff) | |
| download | cachepc-linux-bc537a9cc47eec7f4e32b8164c494ddc35dca8ac.tar.gz cachepc-linux-bc537a9cc47eec7f4e32b8164c494ddc35dca8ac.zip | |
Merge drm/drm-next into drm-misc-next
Now that 4.19-rc1 is cut, backmerge it into -misc-next.
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Diffstat (limited to 'include/linux/bits.h')
| -rw-r--r-- | include/linux/bits.h | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/include/linux/bits.h b/include/linux/bits.h new file mode 100644 index 000000000000..2b7b532c1d51 --- /dev/null +++ b/include/linux/bits.h @@ -0,0 +1,26 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __LINUX_BITS_H +#define __LINUX_BITS_H +#include <asm/bitsperlong.h> + +#define BIT(nr) (1UL << (nr)) +#define BIT_ULL(nr) (1ULL << (nr)) +#define BIT_MASK(nr) (1UL << ((nr) % BITS_PER_LONG)) +#define BIT_WORD(nr) ((nr) / BITS_PER_LONG) +#define BIT_ULL_MASK(nr) (1ULL << ((nr) % BITS_PER_LONG_LONG)) +#define BIT_ULL_WORD(nr) ((nr) / BITS_PER_LONG_LONG) +#define BITS_PER_BYTE 8 + +/* + * Create a contiguous bitmask starting at bit position @l and ending at + * position @h. For example + * GENMASK_ULL(39, 21) gives us the 64bit vector 0x000000ffffe00000. + */ +#define GENMASK(h, l) \ + (((~0UL) - (1UL << (l)) + 1) & (~0UL >> (BITS_PER_LONG - 1 - (h)))) + +#define GENMASK_ULL(h, l) \ + (((~0ULL) - (1ULL << (l)) + 1) & \ + (~0ULL >> (BITS_PER_LONG_LONG - 1 - (h)))) + +#endif /* __LINUX_BITS_H */ |