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Message-ID: <20070603204839.GO9240@uranus.ravnborg.org>
Date: Sun, 3 Jun 2007 22:48:39 +0200
From: Sam Ravnborg <sam@...nborg.org>
To: LKML <linux-kernel@...r.kernel.org>,
Andrew Morton <akpm@...ux-foundation.org>,
kbuild-devel@...ts.sourceforge.net
Subject: [PATCH 14/19] kbuild: refactor code in modpost to improve maintainability
Subject: [PATCH 14/19] kbuild: refactor code in modpost to improve maintainability
From: Sam Ravnborg <sam@...nborg.org>
Date: Sat, 2 Jun 2007 21:18:51 +0200
There were a great deal of overlap between the two functions
that check which sections may reference .init.text and .exit.text.
Factor out common check to a separate function and
sort entries in the original functions.
Signed-off-by: Sam Ravnborg <sam@...nborg.org>
---
scripts/mod/modpost.c | 140 +++++++++++++++++++++++-------------------------
1 files changed, 67 insertions(+), 73 deletions(-)
diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index b824198..2b881c2 100644
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -858,14 +858,6 @@ static void warn_sec_mismatch(const char *modname, const char *fromsec,
elf->strtab + before->st_name, refsymname))
return;
- /* fromsec whitelist - without a valid 'before'
- * powerpc has a GOT table in .got2 section
- * and also a .toc section */
- if (strcmp(fromsec, ".got2") == 0)
- return;
- if (strcmp(fromsec, ".toc") == 0)
- return;
-
if (before && after) {
warn("%s(%s+0x%llx): Section mismatch: reference to %s:%s "
"(between '%s' and '%s')\n",
@@ -1075,6 +1067,60 @@ static void check_sec_ref(struct module *mod, const char *modname,
}
}
+/*
+ * Identify sections from which references to either a
+ * .init or a .exit section is OK.
+ *
+ * [OPD] Keith Ownes <kaos@....com> commented:
+ * 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 initexit_section_ref_ok(const char *name)
+{
+ const char **s;
+ /* Absolute section names */
+ const char *namelist1[] = {
+ "__bug_table", /* used by powerpc for BUG() */
+ "__ex_table",
+ ".altinstructions",
+ ".fixup",
+ ".opd", /* See comment [OPD] */
+ ".parainstructions",
+ ".pdr",
+ ".plt", /* seen on ARCH=um build on x86_64. Harmless */
+ ".smp_locks",
+ ".stab",
+ NULL
+ };
+ /* Start of section names */
+ const char *namelist2[] = {
+ ".debug",
+ ".eh_frame",
+ ".note", /* ignore ELF notes - may contain anything */
+ ".got", /* powerpc - global offset table */
+ ".toc", /* powerpc - table of contents */
+ NULL
+ };
+ /* part of section name */
+ const char *namelist3 [] = {
+ ".unwind", /* Sample: IA_64.unwind.exit.text */
+ NULL
+ };
+
+ for (s = namelist1; *s; s++)
+ if (strcmp(*s, name) == 0)
+ return 1;
+ for (s = namelist2; *s; s++)
+ if (strncmp(*s, name, strlen(*s)) == 0)
+ return 1;
+ for (s = namelist3; *s; s++)
+ if (strstr(name, *s) != NULL)
+ return 1;
+ return 0;
+}
+
/**
* Functions used only during module init is marked __init and is stored in
* a .init.text section. Likewise data is marked __initdata and stored in
@@ -1111,52 +1157,32 @@ static int init_section_ref_ok(const char *name)
const char **s;
/* Absolute section names */
const char *namelist1[] = {
+ "__ftr_fixup", /* powerpc cpu feature fixup */
+ "__fw_ftr_fixup", /* powerpc firmware feature fixup */
+ "__param",
+ ".data.rel.ro", /* used by parisc64 */
".init",
- ".opd", /* see comment [OPD] at exit_section_ref_ok() */
- ".toc1", /* used by ppc64 */
- ".stab",
- ".data.rel.ro", /* used by parisc64 */
- ".parainstructions",
- ".text.lock",
- "__bug_table", /* used by powerpc for BUG() */
".pci_fixup_header",
".pci_fixup_final",
- ".pdr",
- "__param",
- "__ex_table",
- ".fixup",
- ".smp_locks",
- ".plt", /* seen on ARCH=um build on x86_64. Harmless */
- "__ftr_fixup", /* powerpc cpu feature fixup */
- "__fw_ftr_fixup", /* powerpc firmware feature fixup */
+ ".text.lock",
NULL
};
/* Start of section names */
const char *namelist2[] = {
".init.",
- ".altinstructions",
- ".eh_frame",
- ".debug",
- ".parainstructions",
".rodata",
- ".note", /* ignore ELF notes - may contain anything */
- NULL
- };
- /* part of section name */
- const char *namelist3 [] = {
- ".unwind", /* sample: IA_64.unwind.init.text */
NULL
};
+ if (initexit_section_ref_ok(name))
+ return 1;
+
for (s = namelist1; *s; s++)
if (strcmp(*s, name) == 0)
return 1;
for (s = namelist2; *s; s++)
if (strncmp(*s, name, strlen(*s)) == 0)
return 1;
- for (s = namelist3; *s; s++)
- if (strstr(name, *s) != NULL)
- return 1;
if (strrcmp(name, ".init") == 0)
return 1;
return 0;
@@ -1181,58 +1207,26 @@ static int exit_section(const char *name)
/*
* Identify sections from which references to a .exit section is OK.
- *
- * [OPD] Keith Ownes <kaos@....com> commented:
- * 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)
{
const char **s;
/* Absolute section names */
const char *namelist1[] = {
- ".exit.text",
".exit.data",
+ ".exit.text",
+ ".exitcall.exit",
".init.text",
".rodata",
- ".opd", /* See comment [OPD] */
- ".toc1", /* used by ppc64 */
- ".altinstructions",
- ".pdr",
- "__bug_table", /* used by powerpc for BUG() */
- ".exitcall.exit",
- ".eh_frame",
- ".parainstructions",
- ".stab",
- "__ex_table",
- ".fixup",
- ".smp_locks",
- ".plt", /* seen on ARCH=um build on x86_64. Harmless */
- NULL
- };
- /* Start of section names */
- const char *namelist2[] = {
- ".debug",
- ".note", /* ignore ELF notes - may contain anything */
- NULL
- };
- /* part of section name */
- const char *namelist3 [] = {
- ".unwind", /* Sample: IA_64.unwind.exit.text */
NULL
};
+ if (initexit_section_ref_ok(name))
+ return 1;
+
for (s = namelist1; *s; s++)
if (strcmp(*s, name) == 0)
return 1;
- for (s = namelist2; *s; s++)
- if (strncmp(*s, name, strlen(*s)) == 0)
- return 1;
- for (s = namelist3; *s; s++)
- if (strstr(name, *s) != NULL)
- return 1;
return 0;
}
--
1.5.1.rc3.1544.g8a923
----- End forwarded message -----
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