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CONFIG_DEBUG_SECTION_MISMATCH: Enable full Section mismatch analysis

General informations

The Linux kernel configuration item CONFIG_DEBUG_SECTION_MISMATCH:

Help text

The section mismatch analysis checks if there are illegal references from one section to another section. During linktime or runtime, some sections are dropped; any use of code/data previously in these sections would most likely result in an oops. In the code, functions and variables are annotated with __init, __cpuinit, etc. (see the full list in include/linux/init.h), which results in the code/data being placed in specific sections. The section mismatch analysis is always performed after a full kernel build, and enabling this option causes the following additional steps to occur: - Add the option -fno-inline-functions-called-once to gcc commands. When inlining a function annotated with __init in a non-init function, we would lose the section information and thus the analysis would not catch the illegal reference. This option tells gcc to inline less (but it does result in a larger kernel). - Run the section mismatch analysis for each module/built-in.o file. When we run the section mismatch analysis on vmlinux.o, we lose valueble information about where the mismatch was introduced. Running the analysis for each module/built-in.o file tells where the mismatch happens much closer to the source. The drawback is that the same mismatch is reported at least twice. - Enable verbose reporting from modpost in order to help resolve the section mismatches that are reported.

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