---

yaml --- r: 305408 b: refs/heads/master c: 1873e87 h: refs/heads/master v: v3
git-mirror · Mar 30, 2012 · ebb0189 · ebb0189
1 parent 41e60bf
commit ebb0189
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Showing 3 changed files with 20 additions and 1 deletion.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 35372a7d45291140a97518a8d1c8cb0e31ee2bb7
+refs/heads/master: 1873e870fd63ee4b87dbe0125ca373e420fb4987
diff --git a/trunk/Makefile b/trunk/Makefile
@@ -564,6 +564,16 @@ else
 KBUILD_CFLAGS	+= -O2
 endif
 
+ifdef CONFIG_READABLE_ASM
+# Disable optimizations that make assembler listings hard to read.
+# reorder blocks reorders the control in the function
+# ipa clone creates specialized cloned functions
+# partial inlining inlines only parts of functions
+KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
+                 $(call cc-option,-fno-ipa-cp-clone,) \
+                 $(call cc-option,-fno-partial-inlining)
+endif
+
 include $(srctree)/arch/$(SRCARCH)/Makefile
 
 ifneq ($(CONFIG_FRAME_WARN),0)

diff --git a/trunk/lib/Kconfig.debug b/trunk/lib/Kconfig.debug
@@ -70,6 +70,15 @@ config STRIP_ASM_SYMS
 	  that look like '.Lxxx') so they don't pollute the output of
 	  get_wchan() and suchlike.
 
+config READABLE_ASM
+        bool "Generate readable assembler code"
+        depends on DEBUG_KERNEL
+        help
+          Disable some compiler optimizations that tend to generate human unreadable
+          assembler output. This may make the kernel slightly slower, but it helps
+          to keep kernel developers who have to stare a lot at assembler listings
+          sane.
+
 config UNUSED_SYMBOLS
 	bool "Enable unused/obsolete exported symbols"
 	default y if X86