use SYS_openat when available
some architecture like AArch64 may not have the open syscall, but have openat syscall. so check and use SYS_openat if SYS_openat available if SYS_open is not supported at init_thp_state.
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@ -563,6 +563,9 @@ init_thp_state(void) {
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#if defined(JEMALLOC_USE_SYSCALL) && defined(SYS_open)
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int fd = (int)syscall(SYS_open,
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"/sys/kernel/mm/transparent_hugepage/enabled", O_RDONLY);
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#elif defined(JEMALLOC_USE_SYSCALL) && defined(SYS_openat)
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int fd = (int)syscall(SYS_openat,
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AT_FDCWD, "/sys/kernel/mm/transparent_hugepage/enabled", O_RDONLY);
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#else
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int fd = open("/sys/kernel/mm/transparent_hugepage/enabled", O_RDONLY);
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#endif
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