Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) Software emulation of deprecated SWP instruction (CONFIG_SWP_EMULATE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) ---------------------------------------------------------------------
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4) ARMv6 architecture deprecates use of the SWP/SWPB instructions, and recommeds
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) moving to the load-locked/store-conditional instructions LDREX and STREX.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) ARMv7 multiprocessing extensions introduce the ability to disable these
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) instructions, triggering an undefined instruction exception when executed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) Trapped instructions are emulated using an LDREX/STREX or LDREXB/STREXB
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) sequence. If a memory access fault (an abort) occurs, a segmentation fault is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) signalled to the triggering process.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) /proc/cpu/swp_emulation holds some statistics/information, including the PID of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) the last process to trigger the emulation to be invocated. For example::
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)   Emulated SWP:		12
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)   Emulated SWPB:		0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)   Aborted SWP{B}:		1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)   Last process:		314
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) NOTE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)   when accessing uncached shared regions, LDREX/STREX rely on an external
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)   transaction monitoring block called a global monitor to maintain update
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)   atomicity. If your system does not implement a global monitor, this option can
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)   cause programs that perform SWP operations to uncached memory to deadlock, as
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)   the STREX operation will always fail.