函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:mm\mempolicy.c Create Date:2022-07-27 17:05:38
Last Modify:2020-03-17 22:28:11 Copyright©Brick
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函数名称：COMPAT_SYSCALL_DEFINE6

函数原型：COMPAT_SYSCALL_DEFINE6(mbind, compat_ulong_t, start, compat_ulong_t, len, compat_ulong_t, mode, compat_ulong_t __user *, nmask, compat_ulong_t, maxnode, compat_ulong_t, flags)

返回类型：

参数：无

1664  unsigned long __user * nm = NULL
1668  nr_bits等于min_t - return minimum of two values, using the specified type*@type: data type to use*@x: first value*@y: second value(unsignedlong, maxnode - 1, MAX_NUMNODES)
1669  alloc_size等于@a is a power of 2 value (nr_bits, BITS_PER_LONG)除8
1671  如果nmask则
1672  如果compat_get_bitmap(nodes_addr(bm), nmask, nr_bits)则返回:负EFAULT
1674  nm等于Allocate user-space memory for the duration of a single system call,* in order to marshall parameters inside a compat thunk.
1675  如果copy_to_user(nm, nodes_addr(bm), alloc_size)则返回:负EFAULT
1679  返回:kernel_mbind(start, len, Async or sync migration mode , nm, nr_bits + 1, flags)