modpost: document the use of struct section_check.
struct section_check is used as a generic way of describing what relocations are authorized/forbidden when running modpost. This commit tries to describe how each field is used. Signed-off-by: Quentin Casasnovas <quentin.casasnovas@oracle.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> (Fixed "mist"ake)
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@ -930,6 +930,26 @@ enum mismatch {
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EXTABLE_TO_NON_TEXT,
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};
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/**
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* Describe how to match sections on different criterias:
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*
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* @fromsec: Array of sections to be matched.
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*
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* @bad_tosec: Relocations applied to a section in @fromsec to a section in
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* this array is forbidden (black-list). Can be empty.
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*
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* @good_tosec: Relocations applied to a section in @fromsec must be
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* targetting sections in this array (white-list). Can be empty.
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*
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* @mismatch: Type of mismatch.
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*
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* @symbol_white_list: Do not match a relocation to a symbol in this list
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* even if it is targetting a section in @bad_to_sec.
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*
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* @handler: Specific handler to call when a match is found. If NULL,
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* default_mismatch_handler() will be called.
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*
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*/
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struct sectioncheck {
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const char *fromsec[20];
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const char *bad_tosec[20];
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