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authorSam Ravnborg <sam@ravnborg.org>2008-01-21 15:31:44 -0500
committerSam Ravnborg <sam@ravnborg.org>2008-01-28 17:21:18 -0500
commit91341d4b2c196c689acf90e9e96f28f8d5c6665f (patch)
treeb4676097b6a3fe4f5e9d420ba9d9956bb883e506 /lib/Kconfig.debug
parenteb8f689046b857874e964463619f09df06d59fad (diff)
kbuild: introduce new option to enhance section mismatch analysis
Setting the option DEBUG_SECTION_MISMATCH will report additional section mismatch'es but this should in the end makes it possible to get rid of all of them. See help text in lib/Kconfig.debug for details. Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Diffstat (limited to 'lib/Kconfig.debug')
-rw-r--r--lib/Kconfig.debug30
1 files changed, 30 insertions, 0 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 14fb355e3caa..748e72be6e68 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -79,6 +79,36 @@ config HEADERS_CHECK
79 exported to $(INSTALL_HDR_PATH) (usually 'usr/include' in 79 exported to $(INSTALL_HDR_PATH) (usually 'usr/include' in
80 your build tree), to make sure they're suitable. 80 your build tree), to make sure they're suitable.
81 81
82config DEBUG_SECTION_MISMATCH
83 bool "Enable full Section mismatch analysis"
84 default n
85 help
86 The section mismatch analysis checks if there are illegal
87 references from one section to another section.
88 Linux will during link or during runtime drop some sections
89 and any use of code/data previously in these sections will
90 most likely result in an oops.
91 In the code functions and variables are annotated with
92 __init, __devinit etc. (see full list in include/linux/init.h)
93 which result in the code/data being placed in specific sections.
94 The section mismatch anaylsis are always done after a full
95 kernel build but enabling this options will in addition
96 do the following:
97 - Add the option -fno-inline-functions-called-once to gcc
98 When inlining a function annotated __init in a non-init
99 function we would loose the section information and thus
100 the analysis would not catch the illegal reference.
101 This options tell gcc to inline less but will also
102 result in a larger kernel.
103 - Run the section mismatch analysis for each module/built-in.o
104 When we run the section mismatch analysis on vmlinux.o we
105 looses valueable information about where the mismatch was
106 introduced.
107 Running the analysis for each module/built-in.o file
108 will tell where the mismatch happens much closer to the
109 source. The drawback is that we will report the same
110 mismatch at least twice.
111
82config DEBUG_KERNEL 112config DEBUG_KERNEL
83 bool "Kernel debugging" 113 bool "Kernel debugging"
84 help 114 help