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arch: add ARCH_HAS_SET_MEMORY config

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Currently, there's no good way to test for the presence of
set_memory_ro/rw/x/nx() helpers implemented by archs such as
x86, arm, arm64 and s390.

There's DEBUG_SET_MODULE_RONX and DEBUG_RODATA, however both
don't really reflect that: set_memory_*() are also available
even when DEBUG_SET_MODULE_RONX is turned off, and DEBUG_RODATA
is set by parisc, but doesn't implement above functions. Thus,
add ARCH_HAS_SET_MEMORY that is selected by mentioned archs,
where generic code can test against this.

This also allows later on to move DEBUG_SET_MODULE_RONX out of
the arch specific Kconfig to define it only once depending on
ARCH_HAS_SET_MEMORY.

Suggested-by: Laura Abbott <[email protected]>
Signed-off-by: Daniel Borkmann <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Daniel Borkmann 2017-02-21 16:09:33 +01:00 • committed by David S. Miller
commit d2852a2240
5 changed files with 8 additions and 0 deletions
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4
arch/Kconfig
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@ -222,6 +222,10 @@ config GENERIC_SMP_IDLE_THREAD
config GENERIC_IDLE_POLL_SETUP
bool
# Select if arch has all set_memory_ro/rw/x/nx() functions in asm/cacheflush.h
config ARCH_HAS_SET_MEMORY
bool
# Select if arch init_task initializer is different to init/init_task.c
config ARCH_INIT_TASK
bool