linux-kernel - [PATCH v3] mm:kasan: fix sparse warnings: Should it be static?

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Message-Id: <20241011114537.35664-1-niharchaithanya@gmail.com>
Date: Fri, 11 Oct 2024 17:15:38 +0530
From: Nihar Chaithanya <niharchaithanya@...il.com>
To: ryabinin.a.a@...il.com
Cc: andreyknvl@...il.com,
	kasan-dev@...glegroups.com,
	linux-kernel@...r.kernel.org,
	skhan@...uxfoundation.org,
	Nihar Chaithanya <niharchaithanya@...il.com>,
	kernel test robot <lkp@...el.com>
Subject: [PATCH v3] mm:kasan: fix sparse warnings: Should it be static?

Yes, when making the global variables kasan_ptr_result and
kasan_int_result as static volatile, the warnings are removed and
the variable and assignments are retained, but when just static is
used I understand that it might be optimized.

Add a fix making the global varaibles - static volatile, removing the
warnings:
mm/kasan/kasan_test.c:36:6: warning: symbol 'kasan_ptr_result' was not declared. Should it be static?
mm/kasan/kasan_test.c:37:5: warning: symbol 'kasan_int_result' was not declared. Should it be static?

Reported-by: kernel test robot <lkp@...el.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202312261010.o0lRiI9b-lkp@intel.com/
Signed-off-by: Nihar Chaithanya <niharchaithanya@...il.com>
---
v1 -> v2: Used the aproach of making global variables static to resolve the
warnings instead of local declarations.

v2 -> v3: Making the global variables static volatile to resolve the
warnings.

Link to v1: https://lore.kernel.org/all/20241011033604.266084-1-niharchaithanya@gmail.com/
Link to v2: https://lore.kernel.org/all/20241011095259.17345-1-niharchaithanya@gmail.com/

 mm/kasan/kasan_test_c.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/kasan/kasan_test_c.c b/mm/kasan/kasan_test_c.c
index a181e4780d9d..7884b46a1e71 100644
--- a/mm/kasan/kasan_test_c.c
+++ b/mm/kasan/kasan_test_c.c
@@ -45,8 +45,8 @@ static struct {
  * Some tests use these global variables to store return values from function
  * calls that could otherwise be eliminated by the compiler as dead code.
  */
-void *kasan_ptr_result;
-int kasan_int_result;
+static volatile void *kasan_ptr_result;
+static volatile int kasan_int_result;
 
 /* Probe for console output: obtains test_status lines of interest. */
 static void probe_console(void *ignore, const char *buf, size_t len)
-- 
2.34.1