kbuild: fix false section mismatch warnings

Darren Jenkins <darrenrjenkins@gmail.com> pointed out a
number of false positives where we referenced variables
from a _driver variable.
Fix it by check for that pattern and ignore it.

Randy.Dunlap <rdunlap@xenotime.net> pointed out a similar
set of warnings for a number of scsi drivers.
In scsi world they misname their variables *_template or
*_sht so add these to list of variables that may have references
to .init.text with no warning.

Randy.Dunlap <rdunlap@xenotime.net> also pointed out a scsi driver
with many references to .exit.text from .rodata. This is compiler
generated references and we already ignore these for .init.text, so
ignore them for .exit.text also.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index 7e8079a34adf00dfda1839640c63fcda5e4a657f..cd00e9f0758995e5d027ff9dc96835256b10860c 100644 (file)
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -492,17 +492,19 @@ static int strrcmp(const char *s, const char *sub)
  *   These functions may often be marked __init and we do not want to
  *   warn here.
  *   the pattern is identified by:
- *   tosec   = .init.text | .exit.text
+ *   tosec   = .init.text | .exit.text | .init.data
  *   fromsec = .data
- *   atsym = *_driver, *_ops, *_probe, *probe_one
+ *   atsym = *_driver, *_template, *_sht, *_ops, *_probe, *probe_one
  **/
 static int secref_whitelist(const char *tosec, const char *fromsec,
-                         const char *atsym)
+                           const char *atsym)
 {
        int f1 = 1, f2 = 1;
        const char **s;
        const char *pat2sym[] = {
                "_driver",
+               "_template", /* scsi uses *_template a lot */
+               "_sht",      /* scsi also used *_sht to some extent */
                "_ops",
                "_probe",
                "_probe_one",
@@ -522,7 +524,8 @@ static int secref_whitelist(const char *tosec, const char *fromsec,
 
        /* Check for pattern 2 */
        if ((strcmp(tosec, ".init.text") != 0) &&
-           (strcmp(tosec, ".exit.text") != 0))
+           (strcmp(tosec, ".exit.text") != 0) &&
+           (strcmp(tosec, ".init.data") != 0))
                f2 = 0;
        if (strcmp(fromsec, ".data") != 0)
                f2 = 0;
@@ -820,6 +823,7 @@ static int exit_section(const char *name)
  * For our future {in}sanity, add a comment that this is the ppc .opd
  * section, not the ia64 .opd section.
  * ia64 .opd should not point to discarded sections.
+ * [.rodata] like for .init.text we ignore .rodata references -same reason
  **/
 static int exit_section_ref_ok(const char *name)
 {
@@ -829,6 +833,7 @@ static int exit_section_ref_ok(const char *name)
                ".exit.text",
                ".exit.data",
                ".init.text",
+               ".rodata",
                ".opd", /* See comment [OPD] */
                ".toc1",  /* used by ppc64 */
                ".altinstructions",