CONFIG_CLFLUSH_INSTRUCTION_SUPPORTED

An implementation of sys_cache_flush() that uses CLFLUSH is made available, instead of the one using WBINVD.

This option should only be enabled if it is known in advance that the CPU supports the CLFLUSH instruction. It disables runtime detection of CLFLUSH support thereby reducing both memory footprint and boot time.

Symbol:

CLFLUSH_INSTRUCTION_SUPPORTED
Type:

bool
Value:

“n”
User value:

(no user value)
Visibility:

“n”
Is choice item:

false
Is defined:

true
Is from env.:

false
Is special:

false
Prompts:
  • “CLFLUSH instruction supported” if CPU_MIGHT_SUPPORT_CLFLUSH && !CLFLUSH_DETECT && CPU_MIGHT_SUPPORT_CLFLUSH (value: “n”)
Default values:
  • n (value: “n”)
  • Condition: CPU_MIGHT_SUPPORT_CLFLUSH && !CLFLUSH_DETECT (value: “n”)
Selects:

(no selects)
Reverse (select-related) dependencies:
 

(no reverse dependencies)
Additional dependencies from enclosing menus and ifs:
 

X86 (value: “y”)
Locations:
  • ../arch/x86/Kconfig:174