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Linux/arch/arm64/Kconfig.debug

  1 menu "Kernel hacking"
  2 
  3 source "lib/Kconfig.debug"
  4 
  5 config FRAME_POINTER
  6         bool
  7         default y
  8 
  9 config STRICT_DEVMEM
 10         bool "Filter access to /dev/mem"
 11         depends on MMU
 12         help
 13           If this option is disabled, you allow userspace (root) access to all
 14           of memory, including kernel and userspace memory. Accidental
 15           access to this is obviously disastrous, but specific access can
 16           be used by people debugging the kernel.
 17 
 18           If this option is switched on, the /dev/mem file only allows
 19           userspace access to memory mapped peripherals.
 20 
 21           If in doubt, say Y.
 22 
 23 config PID_IN_CONTEXTIDR
 24         bool "Write the current PID to the CONTEXTIDR register"
 25         help
 26           Enabling this option causes the kernel to write the current PID to
 27           the CONTEXTIDR register, at the expense of some additional
 28           instructions during context switch. Say Y here only if you are
 29           planning to use hardware trace tools with this kernel.
 30 
 31 endmenu

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