The patch titled genksyms: allow to ignore symbol checksum changes has been added to the -mm tree. Its filename is genksyms-allow-to-ignore-symbol-checksum-changes.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/SubmitChecklist when testing your code *** See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find out what to do about this The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/ ------------------------------------------------------ Subject: genksyms: allow to ignore symbol checksum changes From: Andreas Gruenbacher <agruen@xxxxxxx> This adds an "override" keyword for use in *.symvers / *.symref files. When a symbol is overridden, the symbol's old definition will be used for computing checksums instead of the new one, preserving the previous checksum. (Genksyms will still warn about the change.) This is meant to allow distributions to hide minor actual as well as fake ABI changes. (For example, when extra type information becomes available because additional headers are included, this may change checksums even though none of the types used have actully changed.) This approach also allows to get rid of "#ifdef __GENKSYMS__" hacks in the code, which are currently used in some vendor kernels to work around checksum changes. Signed-off-by: Andreas Gruenbacher <agruen@xxxxxxx> Cc: Sam Ravnborg <sam@xxxxxxxxxxxx> Cc: Randy Dunlap <randy.dunlap@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- scripts/genksyms/genksyms.c | 34 ++++++++++++++++++++++++++++++---- scripts/genksyms/genksyms.h | 1 + 2 files changed, 31 insertions(+), 4 deletions(-) diff -puN scripts/genksyms/genksyms.c~genksyms-allow-to-ignore-symbol-checksum-changes scripts/genksyms/genksyms.c --- a/scripts/genksyms/genksyms.c~genksyms-allow-to-ignore-symbol-checksum-changes +++ a/scripts/genksyms/genksyms.c @@ -191,11 +191,26 @@ struct symbol *__add_symbol(const char * /* fall through */ ; else if (sym->type == type && equal_list(sym->defn, defn)) { + if (!sym->is_declared && sym->is_override) { + print_location(); + print_type_name(type, name); + fprintf(stderr, " modversion is " + "unchanged\n"); + } sym->is_declared = 1; return sym; } else if (!sym->is_declared) { - status = is_unknown_symbol(sym) ? - STATUS_DEFINED : STATUS_MODIFIED; + if (sym->is_override && flag_preserve) { + print_location(); + fprintf(stderr, "ignoring "); + print_type_name(type, name); + fprintf(stderr, " modversion change\n"); + sym->is_declared = 1; + return sym; + } else { + status = is_unknown_symbol(sym) ? + STATUS_DEFINED : STATUS_MODIFIED; + } } else { error_with_pos("redefinition of %s", name); return sym; @@ -229,6 +244,7 @@ struct symbol *__add_symbol(const char * sym->is_declared = !is_reference; sym->status = status; + sym->is_override = 0; if (flag_debug) { fprintf(debugfile, "Defn for %s %s == <", @@ -348,9 +364,16 @@ static void read_reference(FILE *f) while (!feof(f)) { struct string_list *defn = NULL; struct string_list *sym, *def; - int is_extern = 0; + int is_extern = 0, is_override = 0; + struct symbol *subsym; sym = read_node(f); + if (sym && sym->tag == SYM_NORMAL && + !strcmp(sym->string, "override")) { + is_override = 1; + free_node(sym); + sym = read_node(f); + } if (!sym) continue; def = read_node(f); @@ -365,8 +388,9 @@ static void read_reference(FILE *f) defn = def; def = read_node(f); } - add_reference_symbol(xstrdup(sym->string), sym->tag, + subsym = add_reference_symbol(xstrdup(sym->string), sym->tag, defn, is_extern); + subsym->is_override = is_override; free_node(sym); } } @@ -743,6 +767,8 @@ int main(int argc, char **argv) while (visited_symbols != (struct symbol *)-1L) { struct symbol *sym = visited_symbols; + if (sym->is_override) + fputs("override ", dumpfile); if (sym->type != SYM_NORMAL) { putc(symbol_type_name[sym->type][0], dumpfile); putc('#', dumpfile); diff -puN scripts/genksyms/genksyms.h~genksyms-allow-to-ignore-symbol-checksum-changes scripts/genksyms/genksyms.h --- a/scripts/genksyms/genksyms.h~genksyms-allow-to-ignore-symbol-checksum-changes +++ a/scripts/genksyms/genksyms.h @@ -49,6 +49,7 @@ struct symbol { int is_extern; int is_declared; enum symbol_status status; + int is_override; }; typedef struct string_list **yystype; _ Patches currently in -mm which might be from agruen@xxxxxxx are genksyms-parser-fix-the-__attribute__-rule.patch genksyms-include-extern-information-in-dumps.patch genksyms-track-symbol-checksum-changes.patch genksyms-allow-to-ignore-symbol-checksum-changes.patch git-unionfs.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html