Patch "modpost: don't emit section mismatch warnings for compiler optimizations" has been added to the 3.18-stable tree

Patch "modpost: don't emit section mismatch warnings for compiler optimizations" has been added to the 3.18-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    modpost: don't emit section mismatch warnings for compiler optimizations

to the 3.18-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     modpost-don-t-emit-section-mismatch-warnings-for-compiler-optimizations.patch
and it can be found in the queue-3.18 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 4a3893d069b788f3570c19c12d9e986e8e15870f Mon Sep 17 00:00:00 2001
From: Paul Gortmaker <paul.gortmaker@windriver.com>
Date: Mon, 20 Apr 2015 10:20:40 +0930
Subject: modpost: don't emit section mismatch warnings for compiler optimizations

From: Paul Gortmaker <paul.gortmaker@windriver.com>

commit 4a3893d069b788f3570c19c12d9e986e8e15870f upstream.

Currently an allyesconfig build [gcc-4.9.1] can generate the following:

   WARNING: vmlinux.o(.text.unlikely+0x3864): Section mismatch in
   reference from the function cpumask_empty.constprop.3() to the
   variable .init.data:nmi_ipi_mask

which comes from the cpumask_empty usage in arch/x86/kernel/nmi_selftest.c.

Normally we would not see a symbol entry for cpumask_empty since it is:

	static inline bool cpumask_empty(const struct cpumask *srcp)

however in this case, the variant of the symbol gets emitted when GCC does
constant propagation optimization.

Fix things up so that any locally optimized constprop variants don't warn
when accessing variables that live in the __init sections.

[arnd: adapted text_sections definition to 3.18]

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 scripts/mod/modpost.c |   22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -902,6 +902,10 @@ static const char *const init_sections[]
 static const char *const init_exit_sections[] =
 	{ALL_INIT_SECTIONS, ALL_EXIT_SECTIONS, NULL };
 
+/* all text sections */
+static const char *const text_sections[] = { ALL_INIT_TEXT_SECTIONS,
+				ALL_EXIT_TEXT_SECTIONS, TEXT_SECTIONS, NULL };
+
 /* data section */
 static const char *const data_sections[] = { DATA_SECTIONS, NULL };
 
@@ -920,6 +924,7 @@ static const char *const data_sections[]
 static const char *const head_sections[] = { ".head.text*", NULL };
 static const char *const linker_symbols[] =
 	{ "__init_begin", "_sinittext", "_einittext", NULL };
+static const char *const optim_symbols[] = { "*.constprop.*", NULL };
 
 enum mismatch {
 	TEXT_TO_ANY_INIT,
@@ -1077,6 +1082,17 @@ static const struct sectioncheck *sectio
  *   This pattern is identified by
  *   refsymname = __init_begin, _sinittext, _einittext
  *
+ * Pattern 5:
+ *   GCC may optimize static inlines when fed constant arg(s) resulting
+ *   in functions like cpumask_empty() -- generating an associated symbol
+ *   cpumask_empty.constprop.3 that appears in the audit.  If the const that
+ *   is passed in comes from __init, like say nmi_ipi_mask, we get a
+ *   meaningless section warning.  May need to add isra symbols too...
+ *   This pattern is identified by
+ *   tosec   = init section
+ *   fromsec = text section
+ *   refsymname = *.constprop.*
+ *
  **/
 static int secref_whitelist(const struct sectioncheck *mismatch,
 			    const char *fromsec, const char *fromsym,
@@ -1109,6 +1125,12 @@ static int secref_whitelist(const struct
 	if (match(tosym, linker_symbols))
 		return 0;
 
+	/* Check for pattern 5 */
+	if (match(fromsec, text_sections) &&
+	    match(tosec, init_sections) &&
+	    match(fromsym, optim_symbols))
+		return 0;
+
 	return 1;
 }
 


Patches currently in stable-queue which might be from paul.gortmaker@windriver.com are

queue-3.18/modpost-don-t-emit-section-mismatch-warnings-for-compiler-optimizations.patch
queue-3.18/modpost-expand-pattern-matching-to-support-substring-matches.patch