21  * MS_ASYNC does not start I/O (it used to, up to 2.5.67).
27  * Or the application may run fadvise(FADV_DONTNEED) against the fd to start
32 SYSCALL_DEFINE3(msync, unsigned long, start, size_t, len, int, flags)  in SYSCALL_DEFINE3()  argument
40 	start = untagged_addr(start);  in SYSCALL_DEFINE3()
44 	if (offset_in_page(start))  in SYSCALL_DEFINE3()
50 	end = start + len;  in SYSCALL_DEFINE3()
51 	if (end < start)  in SYSCALL_DEFINE3()
54 	if (end == start)  in SYSCALL_DEFINE3()
57 	 * If the interval [start,end) covers some unmapped address ranges,  in SYSCALL_DEFINE3()
63 	vma = find_vma(mm, start);  in SYSCALL_DEFINE3()
68 		/* Still start < end. */  in SYSCALL_DEFINE3()
72 		/* Here start < vma->vm_end. */  in SYSCALL_DEFINE3()
73 		if (start < vma->vm_start) {  in SYSCALL_DEFINE3()
76 			start = vma->vm_start;  in SYSCALL_DEFINE3()
77 			if (start >= end)  in SYSCALL_DEFINE3()
81 		/* Here vma->vm_start <= start < vma->vm_end. */  in SYSCALL_DEFINE3()
88 		fstart = (start - vma->vm_start) +  in SYSCALL_DEFINE3()
90 		fend = fstart + (min(end, vma->vm_end) - start) - 1;  in SYSCALL_DEFINE3()
91 		start = vma->vm_end;  in SYSCALL_DEFINE3()
98 			if (error || start >= end)  in SYSCALL_DEFINE3()
101 			vma = find_vma(mm, start);  in SYSCALL_DEFINE3()
103 			if (start >= end) {  in SYSCALL_DEFINE3()