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modpost: use read_text_file() and get_line() for reading text files

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grab_file() mmaps a file, but it is not so efficient here because
get_next_line() copies every line to the temporary buffer anyway.

read_text_file() and get_line() are simpler. get_line() exploits the
library function strchr().

Going forward, the missing *.symvers or *.cmd is a fatal error.
This should not happen because scripts/Makefile.modpost guards the
-i option files with $(wildcard $(input-symdump)).

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
This commit is contained in:
Masahiro Yamada 2020-06-01 14:57:20 +09:00
parent 7c8f5662c5
commit 70f30cfe5b
2 changed files with 14 additions and 17 deletions
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15
scripts/mod/modpost.c
View File

@ -2481,15 +2481,16 @@ static void write_if_changed(struct buffer *b, const char *fname)
**/
static void read_dump(const char *fname)
{
unsigned long size, pos = 0;
void *file = grab_file(fname, &size);
char *line;
char *buf, *pos, *line;
if (!file)
buf = read_text_file(fname);
if (!buf)
/* No symbol versions, silently ignore */
return;
while ((line = get_next_line(&pos, file, size))) {
pos = buf;
while ((line = get_line(&pos))) {
char *symname, *namespace, *modname, *d, *export;
unsigned int crc;
struct module *mod;
@ -2524,10 +2525,10 @@ static void read_dump(const char *fname)
sym_set_crc(symname, crc);
sym_update_namespace(symname, namespace);
}
release_file(file, size);
free(buf);
return;
fail:
release_file(file, size);
free(buf);
fatal("parse error in symbol dump file\n");
}

16
scripts/mod/sumversion.c
View File

@ -303,9 +303,8 @@ static int is_static_library(const char *objfile)
* to figure out source files. */
static int parse_source_files(const char *objfile, struct md4_ctx *md)
{
char *cmd, *file, *line, *dir;
char *cmd, *file, *line, *dir, *pos;
const char *base;
unsigned long flen, pos = 0;
int dirlen, ret = 0, check_files = 0;
cmd = NOFAIL(malloc(strlen(objfile) + sizeof("..cmd")));
@ -323,14 +322,12 @@ static int parse_source_files(const char *objfile, struct md4_ctx *md)
strncpy(dir, objfile, dirlen);
dir[dirlen] = '\0';
file = grab_file(cmd, &flen);
if (!file) {
warn("could not find %s for %s\n", cmd, objfile);
goto out;
}
file = read_text_file(cmd);
pos = file;
/* Sum all files in the same dir or subdirs. */
while ((line = get_next_line(&pos, file, flen)) != NULL) {
while ((line = get_line(&pos))) {
char* p = line;
if (strncmp(line, "source_", sizeof("source_")-1) == 0) {
@ -381,8 +378,7 @@ static int parse_source_files(const char *objfile, struct md4_ctx *md)
/* Everyone parsed OK */
ret = 1;
out_file:
release_file(file, flen);
out:
free(file);
free(dir);
free(cmd);
return ret;