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authorMichael Ellerman <michael@ellerman.id.au>2010-11-07 21:22:29 +0300
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2011-01-21 06:08:33 +0300
commitc0337288ab165be17081d61d4ef13b79d3ac55d4 (patch)
tree0ed7766bae30e2a0ce70772a95840808421ea778 /arch/powerpc/lib
parent50f4df4e6a7ae111fd9b8fada4155675a4410e99 (diff)
downloadlinux-c0337288ab165be17081d61d4ef13b79d3ac55d4.tar.xz
powerpc: Ensure the else case of feature sections will fit
When we create an alternative feature section, the else case must be the same size or smaller than the body. This is because when we patch the else case in we just overwrite the body, so there must be room. Up to now we just did this by inspection, but it's quite easy to enforce it in the assembler, so we should. The only change is to add the ifgt block, but that effects the alignment of the tabs and so the whole macro is modified. Also add a test, but #if 0 it because we don't want to break the build. Anyone who's modifying the feature macros should enable the test. Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/lib')
-rw-r--r--arch/powerpc/lib/feature-fixups-test.S19
1 files changed, 19 insertions, 0 deletions
diff --git a/arch/powerpc/lib/feature-fixups-test.S b/arch/powerpc/lib/feature-fixups-test.S
index cb737484c5aa..f4613118132e 100644
--- a/arch/powerpc/lib/feature-fixups-test.S
+++ b/arch/powerpc/lib/feature-fixups-test.S
@@ -172,6 +172,25 @@ globl(ftr_fixup_test6_expected)
3: or 3,3,3
+#if 0
+/* Test that if we have a larger else case the assembler spots it and
+ * reports an error. #if 0'ed so as not to break the build normally.
+ */
+ftr_fixup_test7:
+ or 1,1,1
+BEGIN_FTR_SECTION
+ or 2,2,2
+ or 2,2,2
+ or 2,2,2
+FTR_SECTION_ELSE
+ or 3,3,3
+ or 3,3,3
+ or 3,3,3
+ or 3,3,3
+ALT_FTR_SECTION_END(0, 1)
+ or 1,1,1
+#endif
+
#define MAKE_MACRO_TEST(TYPE) \
globl(ftr_fixup_test_ ##TYPE##_macros) \
or 1,1,1; \