linux-kernel - [PATCH 3.16 124/131] x86/tools: Fix gcc-7 warning in relocs.c

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Date:   Sat, 29 Sep 2018 22:43:07 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Markus Trippelsdorf" <markus@...ppelsdorf.de>,
        "Thomas Gleixner" <tglx@...utronix.de>
Subject: [PATCH 3.16 124/131] x86/tools: Fix gcc-7 warning in relocs.c

3.16.59-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Markus Trippelsdorf <markus@...ppelsdorf.de>

commit 7ebb916782949621ff6819acf373a06902df7679 upstream.

gcc-7 warns:

In file included from arch/x86/tools/relocs_64.c:17:0:
arch/x86/tools/relocs.c: In function ‘process_64’:
arch/x86/tools/relocs.c:953:2: warning: argument 1 null where non-null expected [-Wnonnull]
  qsort(r->offset, r->count, sizeof(r->offset[0]), cmp_relocs);
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from arch/x86/tools/relocs.h:6:0,
                 from arch/x86/tools/relocs_64.c:1:
/usr/include/stdlib.h:741:13: note: in a call to function ‘qsort’ declared here
 extern void qsort

This happens because relocs16 is not used for ELF_BITS == 64,
so there is no point in trying to sort it.

Make the sort_relocs(&relocs16) call 32bit only.

Signed-off-by: Markus Trippelsdorf <markus@...ppelsdorf.de>
Link: http://lkml.kernel.org/r/20161215124513.GA289@x4
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
[bwh: Backported to 3.16: Also make sort_relocs(&relocs64) conditional,
 which was done upstream in commit 6d24c5f72dfb "x86-64: Handle PC-relative
 relocations on per-CPU data".]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
--- a/arch/x86/tools/relocs.c
+++ b/arch/x86/tools/relocs.c
@@ -984,9 +984,12 @@ static void emit_relocs(int as_text, int
 		die("Segment relocations found but --realmode not specified\n");
 
 	/* Order the relocations for more efficient processing */
-	sort_relocs(&relocs16);
 	sort_relocs(&relocs32);
+#if ELF_BITS == 64
 	sort_relocs(&relocs64);
+#else
+	sort_relocs(&relocs16);
+#endif
 
 	/* Print the relocations */
 	if (as_text) {