From: Michael Ellerman <mpe@ellerman.id.au>
Date: Wed, 27 Jul 2016 12:46:29 +0000 (+1000)
Subject: powerpc: Add kconfig option to use jump labels for cpu/mmu_has_feature()
X-Git-Tag: v4.8-rc1~30^2~31
X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=bfbfc8a43c028fe3c77c00c4368890e004ca268e;p=linux.git

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 171047822b56..36d7e345f599 100644
--- 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