Messages in this thread Patch in this message | | | From | Yanan Wang <> | Subject | [RFC PATCH v4 2/9] tools headers: Add a macro to get HUGETLB page sizes for mmap | Date | Tue, 2 Mar 2021 20:57:44 +0800 |
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We know that if a system supports multiple hugetlb page sizes, the desired hugetlb page size can be specified in bits [26:31] of the flag arguments. The value in these 6 bits will be the shift of each hugetlb page size.
So add a macro to get the page size shift and then calculate the corresponding hugetlb page size, using flag x.
Cc: Ben Gardon <bgardon@google.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Michael Kerrisk <mtk.manpages@gmail.com> Cc: Thomas Gleixner <tglx@linutronix.de> Suggested-by: Ben Gardon <bgardon@google.com> Signed-off-by: Yanan Wang <wangyanan55@huawei.com> Reviewed-by: Ben Gardon <bgardon@google.com> --- include/uapi/linux/mman.h | 2 ++ tools/include/uapi/linux/mman.h | 2 ++ 2 files changed, 4 insertions(+)
diff --git a/include/uapi/linux/mman.h b/include/uapi/linux/mman.h index f55bc680b5b0..8bd41128a0ee 100644 --- a/include/uapi/linux/mman.h +++ b/include/uapi/linux/mman.h @@ -41,4 +41,6 @@ #define MAP_HUGE_2GB HUGETLB_FLAG_ENCODE_2GB #define MAP_HUGE_16GB HUGETLB_FLAG_ENCODE_16GB +#define MAP_HUGE_PAGE_SIZE(x) (1 << ((x >> MAP_HUGE_SHIFT) & MAP_HUGE_MASK)) + #endif /* _UAPI_LINUX_MMAN_H */ diff --git a/tools/include/uapi/linux/mman.h b/tools/include/uapi/linux/mman.h index f55bc680b5b0..8bd41128a0ee 100644 --- a/tools/include/uapi/linux/mman.h +++ b/tools/include/uapi/linux/mman.h @@ -41,4 +41,6 @@ #define MAP_HUGE_2GB HUGETLB_FLAG_ENCODE_2GB #define MAP_HUGE_16GB HUGETLB_FLAG_ENCODE_16GB +#define MAP_HUGE_PAGE_SIZE(x) (1 << ((x >> MAP_HUGE_SHIFT) & MAP_HUGE_MASK)) + #endif /* _UAPI_LINUX_MMAN_H */ -- 2.23.0
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