powerpc: Add kconfig option to use jump labels for cpu/mmu_has_feature()

Add a kconfig option to control whether we use jump label for the
cpu/mmu_has_feature() checks. Currently this does nothing, but we will
enabled it in the subsequent patches.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --git a/arch/powerpc/Kconfig.debug b/arch/powerpc/Kconfig.debug
index 171047822b561dccb1a72e60c8bc957d43c1588e..36d7e345f5996e8de5e97fe0c9d3e4ac3c6f35a4 100644 (file)
--- a/arch/powerpc/Kconfig.debug
+++ b/arch/powerpc/Kconfig.debug
@@ -60,6 +60,15 @@ config CODE_PATCHING_SELFTEST
        depends on DEBUG_KERNEL
        default n
 
+config JUMP_LABEL_FEATURE_CHECKS
+       bool "Enable use of jump label for cpu/mmu_has_feature()"
+       depends on JUMP_LABEL
+       default y
+       help
+         Selecting this options enables use of jump labels for some internal
+         feature checks. This should generate more optimal code for those
+         checks.
+
 config FTR_FIXUP_SELFTEST
        bool "Run self-tests of the feature-fixup code"
        depends on DEBUG_KERNEL