The ltp test prompts the following bug information under the 5.10 kernel:
BUG: sleeping function called from invalid context at kernel/locking/rtmutex.c:969
in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 796, name: cat
Preemption disabled at:
[<ffffffe40f433980>] do_debug_exception+0x60/0x180
CPU: 3 PID: 796 Comm: cat Not tainted 5.10.59-rt52-KERNEL_VERSION #38
Hardware name: linux,dummy-virt (DT)
Call trace:
 dump_backtrace+0x0/0x198
 show_stack+0x20/0x30
 dump_stack+0xf0/0x13c
 ___might_sleep+0x140/0x178
 rt_spin_lock+0x30/0x90
 force_sig_info_to_task+0x30/0xe0
 force_sig_fault_to_task+0x54/0x78
 force_sig_fault+0x1c/0x28
 arm64_force_sig_fault+0x48/0x78
 send_user_sigtrap+0x4c/0x80
 brk_handler+0x3c/0x68
 do_debug_exception+0xac/0x180
 el0_dbg+0x34/0x58
 el0_sync_handler+0x50/0xb8
 el0_sync+0x180/0x1c0

It has been fixed by
0c34700de5e7 ("arm64: signal: Use ARCH_RT_DELAYS_SIGNAL_SEND.") in
higher versions of the kernel. This patch needs to be compatible with 5.10.
5.10 kernel does not have signal.h file, so adding signal.h file to
define ARCH_RT_DELAYS_SIGNAL_SEND.

Link: https://lore.kernel.org/r/202309121514283793475@zte.com.cn


Signed-off-by: Wang Yong <wang.yong12@zte.com.cn>
Cc: Xuexin Jiang <jiang.xuexin@zte.com.cn>
Cc: Yang Yang <yang.yang29@zte.com.cn>
Cc: Xiaokai Ran <ran.xiaokai@zte.com.cn>
Signed-off-by: Luis Claudio R. Goncalves <lgoncalv@redhat.com>