linux-kernel - [PATCH] kdb; fix -Wsign-compare build warnings

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Date:	Tue, 12 May 2015 16:03:27 +0200
From:	Nicholas Mc Guire <hofrat@...dl.org>
To:	Jason Wessel <jason.wessel@...driver.com>
Cc:	kgdb-bugreport@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
	Nicholas Mc Guire <hofrat@...dl.org>
Subject: [PATCH] kdb; fix -Wsign-compare build warnings

change some local index variables, declared int, being
compared to ARRAY_SIZE() which is returning size_t, to size_t
(see c99 6.5.3.4 -4 and gcc-4.7 manual section 4.15). 

Patch was compile tested with x86_64_defconfig + CONFIG_KGDB=y,
CONFIG_KGDB_KDB=y

Patch is against 4.1-rc3 (localversion-next is -next-20150512)

Signed-off-by: Nicholas Mc Guire <hofrat@...dl.org>
---

The build warnings in kdb_support.c were:
kernel/debug/kdb/kdb_support.c: In function 'kdbnearsym':
kernel/debug/kdb/kdb_support.c:125:17: warning: comparison between signed
and unsigned integer expressions [-Wsign-compare]
kernel/debug/kdb/kdb_support.c:130:9: warning: comparison between signed and
unsigned integer expressions [-Wsign-compare]
kernel/debug/kdb/kdb_support.c: In function 'kdbnearsym_cleanup':
kernel/debug/kdb/kdb_support.c:164:16: warning: comparison between signed
and unsigned integer expressions [-Wsign-compare]
kernel/debug/kdb/kdb_support.c: In function 'kdb_save_flags':
kernel/debug/kdb/kdb_support.c:919:2: warning: comparison between signed and
unsigned integer expressions [-Wsign-compare]

the first 3 are fixed by this patch - the mismatch at line 919 is due 
to negative index values being checked to detect imbalanced use of
kdb_save_flags()/kdb_restore_flags() - fixing it with a case is not really
helpful for readability so it is left as is.

 kernel/debug/kdb/kdb_support.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/debug/kdb/kdb_support.c b/kernel/debug/kdb/kdb_support.c
index 0bb3b81..a7f7e5c 100644
--- a/kernel/debug/kdb/kdb_support.c
+++ b/kernel/debug/kdb/kdb_support.c
@@ -110,7 +110,7 @@ int kdbnearsym(unsigned long addr, kdb_symtab_t *symtab)
 	ret = symtab->sym_name != NULL && *(symtab->sym_name) != '\0';
 
 	if (ret) {
-		int i;
+		size_t i;
 		/* Another 2.6 kallsyms "feature".  Sometimes the sym_name is
 		 * set but the buffer passed into kallsyms_lookup is not used,
 		 * so it contains garbage.  The caller has to work out which
@@ -160,7 +160,7 @@ out:
 
 void kdbnearsym_cleanup(void)
 {
-	int i;
+	size_t i;
 	for (i = 0; i < ARRAY_SIZE(kdb_name_table); ++i) {
 		if (kdb_name_table[i]) {
 			debug_kfree(kdb_name_table[i]);
-- 
1.7.10.4

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