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-rw-r--r--scripts/mod/modpost.c152
1 files changed, 88 insertions, 64 deletions
diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index 2092361..3318692 100644
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -781,10 +781,13 @@ static void check_section(const char *modname, struct elf_info *elf,
#define ALL_EXIT_TEXT_SECTIONS \
".exit.text$", ".devexit.text$", ".cpuexit.text$", ".memexit.text$"
-#define ALL_INIT_SECTIONS INIT_SECTIONS, DEV_INIT_SECTIONS, \
- CPU_INIT_SECTIONS, MEM_INIT_SECTIONS
-#define ALL_EXIT_SECTIONS EXIT_SECTIONS, DEV_EXIT_SECTIONS, \
- CPU_EXIT_SECTIONS, MEM_EXIT_SECTIONS
+#define ALL_XXXINIT_SECTIONS DEV_INIT_SECTIONS, CPU_INIT_SECTIONS, \
+ MEM_INIT_SECTIONS
+#define ALL_XXXEXIT_SECTIONS DEV_EXIT_SECTIONS, CPU_EXIT_SECTIONS, \
+ MEM_EXIT_SECTIONS
+
+#define ALL_INIT_SECTIONS INIT_SECTIONS, ALL_XXXINIT_SECTIONS
+#define ALL_EXIT_SECTIONS EXIT_SECTIONS, ALL_XXXEXIT_SECTIONS
#define DATA_SECTIONS ".data$", ".data.rel$"
#define TEXT_SECTIONS ".text$"
@@ -814,33 +817,29 @@ static const char *data_sections[] = { DATA_SECTIONS, NULL };
/* symbols in .data that may refer to init/exit sections */
-static const char *symbol_white_list[] =
-{
- "*driver",
- "*_template", /* scsi uses *_template a lot */
- "*_timer", /* arm uses ops structures named _timer a lot */
- "*_sht", /* scsi also used *_sht to some extent */
- "*_ops",
- "*_probe",
- "*_probe_one",
- "*_console",
- NULL
-};
+#define DEFAULT_SYMBOL_WHITE_LIST \
+ "*driver", \
+ "*_template", /* scsi uses *_template a lot */ \
+ "*_timer", /* arm uses ops structures named _timer a lot */ \
+ "*_sht", /* scsi also used *_sht to some extent */ \
+ "*_ops", \
+ "*_probe", \
+ "*_probe_one", \
+ "*_console"
static const char *head_sections[] = { ".head.text*", NULL };
static const char *linker_symbols[] =
{ "__init_begin", "_sinittext", "_einittext", NULL };
enum mismatch {
- NO_MISMATCH,
- TEXT_TO_INIT,
- DATA_TO_INIT,
- TEXT_TO_EXIT,
- DATA_TO_EXIT,
- XXXINIT_TO_INIT,
- XXXEXIT_TO_EXIT,
- INIT_TO_EXIT,
- EXIT_TO_INIT,
+ TEXT_TO_ANY_INIT,
+ DATA_TO_ANY_INIT,
+ TEXT_TO_ANY_EXIT,
+ DATA_TO_ANY_EXIT,
+ XXXINIT_TO_SOME_INIT,
+ XXXEXIT_TO_SOME_EXIT,
+ ANY_INIT_TO_ANY_EXIT,
+ ANY_EXIT_TO_ANY_INIT,
EXPORT_TO_INIT_EXIT,
};
@@ -848,6 +847,7 @@ struct sectioncheck {
const char *fromsec[20];
const char *tosec[20];
enum mismatch mismatch;
+ const char *symbol_white_list[20];
};
const struct sectioncheck sectioncheck[] = {
@@ -857,80 +857,103 @@ const struct sectioncheck sectioncheck[] = {
{
.fromsec = { TEXT_SECTIONS, NULL },
.tosec = { ALL_INIT_SECTIONS, NULL },
- .mismatch = TEXT_TO_INIT,
+ .mismatch = TEXT_TO_ANY_INIT,
+ .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
},
{
.fromsec = { DATA_SECTIONS, NULL },
- .tosec = { ALL_INIT_SECTIONS, NULL },
- .mismatch = DATA_TO_INIT,
+ .tosec = { ALL_XXXINIT_SECTIONS, NULL },
+ .mismatch = DATA_TO_ANY_INIT,
+ .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
+},
+{
+ .fromsec = { DATA_SECTIONS, NULL },
+ .tosec = { INIT_SECTIONS, NULL },
+ .mismatch = DATA_TO_ANY_INIT,
+ .symbol_white_list = {
+ "*_template", "*_timer", "*_sht", "*_ops",
+ "*_probe", "*_probe_one", "*_console", NULL
+ },
},
{
.fromsec = { TEXT_SECTIONS, NULL },
.tosec = { ALL_EXIT_SECTIONS, NULL },
- .mismatch = TEXT_TO_EXIT,
+ .mismatch = TEXT_TO_ANY_EXIT,
+ .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
},
{
.fromsec = { DATA_SECTIONS, NULL },
.tosec = { ALL_EXIT_SECTIONS, NULL },
- .mismatch = DATA_TO_EXIT,
+ .mismatch = DATA_TO_ANY_EXIT,
+ .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
},
/* Do not reference init code/data from devinit/cpuinit/meminit code/data */
{
- .fromsec = { DEV_INIT_SECTIONS, CPU_INIT_SECTIONS, MEM_INIT_SECTIONS, NULL },
+ .fromsec = { ALL_XXXINIT_SECTIONS, NULL },
.tosec = { INIT_SECTIONS, NULL },
- .mismatch = XXXINIT_TO_INIT,
+ .mismatch = XXXINIT_TO_SOME_INIT,
+ .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
},
/* Do not reference cpuinit code/data from meminit code/data */
{
.fromsec = { MEM_INIT_SECTIONS, NULL },
.tosec = { CPU_INIT_SECTIONS, NULL },
- .mismatch = XXXINIT_TO_INIT,
+ .mismatch = XXXINIT_TO_SOME_INIT,
+ .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
},
/* Do not reference meminit code/data from cpuinit code/data */
{
.fromsec = { CPU_INIT_SECTIONS, NULL },
.tosec = { MEM_INIT_SECTIONS, NULL },
- .mismatch = XXXINIT_TO_INIT,
+ .mismatch = XXXINIT_TO_SOME_INIT,
+ .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
},
/* Do not reference exit code/data from devexit/cpuexit/memexit code/data */
{
- .fromsec = { DEV_EXIT_SECTIONS, CPU_EXIT_SECTIONS, MEM_EXIT_SECTIONS, NULL },
+ .fromsec = { ALL_XXXEXIT_SECTIONS, NULL },
.tosec = { EXIT_SECTIONS, NULL },
- .mismatch = XXXEXIT_TO_EXIT,
+ .mismatch = XXXEXIT_TO_SOME_EXIT,
+ .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
},
/* Do not reference cpuexit code/data from memexit code/data */
{
.fromsec = { MEM_EXIT_SECTIONS, NULL },
.tosec = { CPU_EXIT_SECTIONS, NULL },
- .mismatch = XXXEXIT_TO_EXIT,
+ .mismatch = XXXEXIT_TO_SOME_EXIT,
+ .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
},
/* Do not reference memexit code/data from cpuexit code/data */
{
.fromsec = { CPU_EXIT_SECTIONS, NULL },
.tosec = { MEM_EXIT_SECTIONS, NULL },
- .mismatch = XXXEXIT_TO_EXIT,
+ .mismatch = XXXEXIT_TO_SOME_EXIT,
+ .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
},
/* Do not use exit code/data from init code */
{
.fromsec = { ALL_INIT_SECTIONS, NULL },
.tosec = { ALL_EXIT_SECTIONS, NULL },
- .mismatch = INIT_TO_EXIT,
+ .mismatch = ANY_INIT_TO_ANY_EXIT,
+ .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
},
/* Do not use init code/data from exit code */
{
.fromsec = { ALL_EXIT_SECTIONS, NULL },
.tosec = { ALL_INIT_SECTIONS, NULL },
- .mismatch = EXIT_TO_INIT,
+ .mismatch = ANY_EXIT_TO_ANY_INIT,
+ .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
},
/* Do not export init/exit functions or data */
{
.fromsec = { "__ksymtab*", NULL },
.tosec = { INIT_SECTIONS, EXIT_SECTIONS, NULL },
- .mismatch = EXPORT_TO_INIT_EXIT
+ .mismatch = EXPORT_TO_INIT_EXIT,
+ .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
}
};
-static int section_mismatch(const char *fromsec, const char *tosec)
+static const struct sectioncheck *section_mismatch(
+ const char *fromsec, const char *tosec)
{
int i;
int elems = sizeof(sectioncheck) / sizeof(struct sectioncheck);
@@ -939,10 +962,10 @@ static int section_mismatch(const char *fromsec, const char *tosec)
for (i = 0; i < elems; i++) {
if (match(fromsec, check->fromsec) &&
match(tosec, check->tosec))
- return check->mismatch;
+ return check;
check++;
}
- return NO_MISMATCH;
+ return NULL;
}
/**
@@ -961,7 +984,7 @@ static int section_mismatch(const char *fromsec, const char *tosec)
* Pattern 2:
* Many drivers utilise a *driver container with references to
* add, remove, probe functions etc.
- * These functions may often be marked __init and we do not want to
+ * These functions may often be marked __devinit and we do not want to
* warn here.
* the pattern is identified by:
* tosec = init or exit section
@@ -982,7 +1005,8 @@ static int section_mismatch(const char *fromsec, const char *tosec)
* refsymname = __init_begin, _sinittext, _einittext
*
**/
-static int secref_whitelist(const char *fromsec, const char *fromsym,
+static int secref_whitelist(const struct sectioncheck *mismatch,
+ const char *fromsec, const char *fromsym,
const char *tosec, const char *tosym)
{
/* Check for pattern 1 */
@@ -994,7 +1018,7 @@ static int secref_whitelist(const char *fromsec, const char *fromsym,
/* Check for pattern 2 */
if (match(tosec, init_exit_sections) &&
match(fromsec, data_sections) &&
- match(fromsym, symbol_white_list))
+ match(fromsym, mismatch->symbol_white_list))
return 0;
/* Check for pattern 3 */
@@ -1155,7 +1179,8 @@ static int is_function(Elf_Sym *sym)
* Try to find symbols near it so user can find it.
* Check whitelist before warning - it may be a false positive.
*/
-static void report_sec_mismatch(const char *modname, enum mismatch mismatch,
+static void report_sec_mismatch(const char *modname,
+ const struct sectioncheck *mismatch,
const char *fromsec,
unsigned long long fromaddr,
const char *fromsym,
@@ -1186,8 +1211,8 @@ static void report_sec_mismatch(const char *modname, enum mismatch mismatch,
modname, fromsec, fromaddr, from, fromsym, from_p, to, tosec,
tosym, to_p);
- switch (mismatch) {
- case TEXT_TO_INIT:
+ switch (mismatch->mismatch) {
+ case TEXT_TO_ANY_INIT:
fprintf(stderr,
"The function %s%s() references\n"
"the %s %s%s%s.\n"
@@ -1197,8 +1222,8 @@ static void report_sec_mismatch(const char *modname, enum mismatch mismatch,
to, sec2annotation(tosec), tosym, to_p,
fromsym, sec2annotation(tosec), tosym);
break;
- case DATA_TO_INIT: {
- const char **s = symbol_white_list;
+ case DATA_TO_ANY_INIT: {
+ const char *const *s = mismatch->symbol_white_list;
fprintf(stderr,
"The variable %s references\n"
"the %s %s%s%s\n"
@@ -1211,15 +1236,15 @@ static void report_sec_mismatch(const char *modname, enum mismatch mismatch,
fprintf(stderr, "\n");
break;
}
- case TEXT_TO_EXIT:
+ case TEXT_TO_ANY_EXIT:
fprintf(stderr,
"The function %s() references a %s in an exit section.\n"
"Often the %s %s%s has valid usage outside the exit section\n"
"and the fix is to remove the %sannotation of %s.\n",
fromsym, to, to, tosym, to_p, sec2annotation(tosec), tosym);
break;
- case DATA_TO_EXIT: {
- const char **s = symbol_white_list;
+ case DATA_TO_ANY_EXIT: {
+ const char *const *s = mismatch->symbol_white_list;
fprintf(stderr,
"The variable %s references\n"
"the %s %s%s%s\n"
@@ -1232,8 +1257,8 @@ static void report_sec_mismatch(const char *modname, enum mismatch mismatch,
fprintf(stderr, "\n");
break;
}
- case XXXINIT_TO_INIT:
- case XXXEXIT_TO_EXIT:
+ case XXXINIT_TO_SOME_INIT:
+ case XXXEXIT_TO_SOME_EXIT:
fprintf(stderr,
"The %s %s%s%s references\n"
"a %s %s%s%s.\n"
@@ -1243,7 +1268,7 @@ static void report_sec_mismatch(const char *modname, enum mismatch mismatch,
to, sec2annotation(tosec), tosym, to_p,
tosym, fromsym, tosym);
break;
- case INIT_TO_EXIT:
+ case ANY_INIT_TO_ANY_EXIT:
fprintf(stderr,
"The %s %s%s%s references\n"
"a %s %s%s%s.\n"
@@ -1256,7 +1281,7 @@ static void report_sec_mismatch(const char *modname, enum mismatch mismatch,
to, sec2annotation(tosec), tosym, to_p,
sec2annotation(tosec), tosym, to_p);
break;
- case EXIT_TO_INIT:
+ case ANY_EXIT_TO_ANY_INIT:
fprintf(stderr,
"The %s %s%s%s references\n"
"a %s %s%s%s.\n"
@@ -1275,8 +1300,6 @@ static void report_sec_mismatch(const char *modname, enum mismatch mismatch,
"Fix this by removing the %sannotation of %s "
"or drop the export.\n",
tosym, sec2annotation(tosec), sec2annotation(tosec), tosym);
- case NO_MISMATCH:
- /* To get warnings on missing members */
break;
}
fprintf(stderr, "\n");
@@ -1286,11 +1309,11 @@ static void check_section_mismatch(const char *modname, struct elf_info *elf,
Elf_Rela *r, Elf_Sym *sym, const char *fromsec)
{
const char *tosec;
- enum mismatch mismatch;
+ const struct sectioncheck *mismatch;
tosec = sec_name(elf, sym->st_shndx);
mismatch = section_mismatch(fromsec, tosec);
- if (mismatch != NO_MISMATCH) {
+ if (mismatch) {
Elf_Sym *to;
Elf_Sym *from;
const char *tosym;
@@ -1302,7 +1325,8 @@ static void check_section_mismatch(const char *modname, struct elf_info *elf,
tosym = sym_name(elf, to);
/* check whitelist - we may ignore it */
- if (secref_whitelist(fromsec, fromsym, tosec, tosym)) {
+ if (secref_whitelist(mismatch,
+ fromsec, fromsym, tosec, tosym)) {
report_sec_mismatch(modname, mismatch,
fromsec, r->r_offset, fromsym,
is_function(from), tosec, tosym,

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