CONFIG_DEBUG_SECTION_MISMATCH: Enable full Section mismatch analysis

General informations

The Linux kernel configuration item CONFIG_DEBUG_SECTION_MISMATCH:

• prompt: Enable full Section mismatch analysis
• type: bool
• depends on: CONFIG_CC_IS_GCC
• defined in lib/Kconfig.debug
• found in Linux kernels: 2.6.25–2.6.39, 3.0–3.19, 4.0–4.20, 5.0–5.19, 6.0–6.18, 6.19-rc+HEAD

Help text

The section mismatch analysis checks if there are illegal references from one section to another. 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, __initdata, and so on (see the full list in include/linux/init.h). This directs the toolchain to place code/data in specific sections.

The section mismatch analysis is always performed after a full kernel build, and enabling this option causes the option -fno-inline-functions-called-once to be added to gcc commands.

However, 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).

Hardware

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This page is automaticly generated with free (libre, open) software lkddb(see lkddb-sources).

The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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