From 5dae9a550a7478c8d6a7da2336d3ceeebf90ab84 Mon Sep 17 00:00:00 2001 From: Andreas Gruenbacher Date: Mon, 1 Dec 2008 14:21:03 -0800 Subject: genksyms: allow to ignore symbol checksum changes 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 Cc: Randy Dunlap Signed-off-by: Andrew Morton Signed-off-by: Sam Ravnborg --- scripts/genksyms/genksyms.c | 34 ++++++++++++++++++++++++++++++---- 1 file changed, 30 insertions(+), 4 deletions(-) (limited to 'scripts/genksyms/genksyms.c') diff --git a/scripts/genksyms/genksyms.c b/scripts/genksyms/genksyms.c index ddac1746908e..3a8297b5184c 100644 --- a/scripts/genksyms/genksyms.c +++ b/scripts/genksyms/genksyms.c @@ -191,11 +191,26 @@ struct symbol *__add_symbol(const char *name, enum symbol_type type, /* 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 *name, enum symbol_type type, 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); -- cgit v1.2.3