Function report

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:mm\mempolicy.c Create Date:2022-07-28 15:32:28
Last Modify:2020-03-17 22:28:11 Copyright©Brick
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Name:COMPAT_SYSCALL_DEFINE5

Proto:COMPAT_SYSCALL_DEFINE5(get_mempolicy, int __user *, policy, compat_ulong_t __user *, nmask, compat_ulong_t, maxnode, compat_ulong_t, addr, compat_ulong_t, flags)

Type:

Parameter:Nothing

1615  unsigned long __user * nm = NULL
1617  DECLARE_BITMAP(bm, MAX_NUMNODES)
1619  nr_bits = 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, nr_node_ids)
1620  alloc_size = @a is a power of 2 value (nr_bits, BITS_PER_LONG) / 8
1622  If nmask Then nm = Allocate user-space memory for the duration of a single system call,* in order to marshall parameters inside a compat thunk.
1625  err = Retrieve NUMA policy
1627  If Not err && nmask Then
1629  copy_size = min_t - return minimum of two values, using the specified type*@type: data type to use*@x: first value*@y: second value(unsignedlong, size of bm , alloc_size)
1630  err = copy_from_user(bm, nm, copy_size)
1632  err |= lear_user - Zero a block of memory in user space.*@to: Destination address, in user space.*@n: Number of bytes to zero.* Zero a block of memory in user space.* Return: number of bytes that could not be cleared.* On success, this will be zero.
1633  err |= compat_put_bitmap(nmask, bm, nr_bits)
1636  Return err