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 !CLFLUSH_DETECT && CACHE_FLUSHING (value: “n”)

Default values:

• n (value: “n”)
• Condition: !CLFLUSH_DETECT && CACHE_FLUSHING (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:188