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| author | Sam Ravnborg <sam@ravnborg.org> | 2008-01-21 23:31:44 +0300 |
|---|---|---|
| committer | Sam Ravnborg <sam@ravnborg.org> | 2008-01-29 01:21:18 +0300 |
| commit | 91341d4b2c196c689acf90e9e96f28f8d5c6665f (patch) | |
| tree | b4676097b6a3fe4f5e9d420ba9d9956bb883e506 /lib/Kconfig.debug | |
| parent | eb8f689046b857874e964463619f09df06d59fad (diff) | |
| download | linux-91341d4b2c196c689acf90e9e96f28f8d5c6665f.tar.xz | |
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.debug | 30 |
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 exported to $(INSTALL_HDR_PATH) (usually 'usr/include' in your build tree), to make sure they're suitable. +config DEBUG_SECTION_MISMATCH + bool "Enable full Section mismatch analysis" + default n + help + The section mismatch analysis checks if there are illegal + references from one section to another section. + Linux will during link or during runtime drop some sections + and any use of code/data previously in these sections will + most likely result in an oops. + In the code functions and variables are annotated with + __init, __devinit etc. (see full list in include/linux/init.h) + which result in the code/data being placed in specific sections. + The section mismatch anaylsis are always done after a full + kernel build but enabling this options will in addition + do the following: + - Add the option -fno-inline-functions-called-once to gcc + When inlining a function annotated __init in a non-init + function we would loose the section information and thus + the analysis would not catch the illegal reference. + This options tell gcc to inline less but will also + result in a larger kernel. + - Run the section mismatch analysis for each module/built-in.o + When we run the section mismatch analysis on vmlinux.o we + looses valueable information about where the mismatch was + introduced. + Running the analysis for each module/built-in.o file + will tell where the mismatch happens much closer to the + source. The drawback is that we will report the same + mismatch at least twice. + config DEBUG_KERNEL bool "Kernel debugging" help |