tipc: allocate user memory with GFP_KERNEL flag

tipc: allocate user memory with GFP_KERNEL flag

Until now, we allocate memory always with GFP_ATOMIC flag.
When the system is under memory pressure and a user tries to send,
the send fails due to low memory. However, the user application
can wait for free memory if we allocate it using GFP_KERNEL flag.

In this commit, we use allocate memory with GFP_KERNEL for all user
allocation.

Reported-by: Rune Torgersen <[email protected]>
Acked-by: Jon Maloy <[email protected]>
Signed-off-by: Parthasarathy Bhuvaragan <[email protected]>
Signed-off-by: David S. Miller <[email protected]>