linux-kernel - [PATCH v2] lkdtm/bugs: fix build error in lkdtm_EXHAUST

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Date:   Tue, 27 Aug 2019 11:36:19 -0600
From:   Raul E Rangel <rrangel@...omium.org>
To:     keescook@...omium.org
Cc:     Raul E Rangel <rrangel@...omium.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org
Subject: [PATCH v2] lkdtm/bugs: fix build error in lkdtm_EXHAUST_STACK

lkdtm/bugs.c:94:2: error: format '%d' expects argument of type 'int', but argument 2 has type 'long unsigned int' [-Werror=format=]
  pr_info("Calling function with %d frame size to depth %d ...\n",
  ^
THREAD_SIZE is defined as a unsigned long, cast CONFIG_FRAME_WARN to
unsigned long as well.

Fixes: 24cccab42c419 ("lkdtm/bugs: Adjust recursion test to avoid elision")

Signed-off-by: Raul E Rangel <rrangel@...omium.org>
---

Changes in v2:
- Correctly cast CONFIG_FRAME_WARN so the type is consistent.

 drivers/misc/lkdtm/bugs.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/misc/lkdtm/bugs.c b/drivers/misc/lkdtm/bugs.c
index 1606658b9b7e..24245ccdba72 100644
--- a/drivers/misc/lkdtm/bugs.c
+++ b/drivers/misc/lkdtm/bugs.c
@@ -22,7 +22,7 @@ struct lkdtm_list {
  * recurse past the end of THREAD_SIZE by default.
  */
 #if defined(CONFIG_FRAME_WARN) && (CONFIG_FRAME_WARN > 0)
-#define REC_STACK_SIZE (CONFIG_FRAME_WARN / 2)
+#define REC_STACK_SIZE (_AC(CONFIG_FRAME_WARN, UL) / 2)
 #else
 #define REC_STACK_SIZE (THREAD_SIZE / 8)
 #endif
@@ -91,7 +91,7 @@ void lkdtm_LOOP(void)
 
 void lkdtm_EXHAUST_STACK(void)
 {
-	pr_info("Calling function with %d frame size to depth %d ...\n",
+	pr_info("Calling function with %lu frame size to depth %d ...\n",
 		REC_STACK_SIZE, recur_count);
 	recursive_loop(recur_count);
 	pr_info("FAIL: survived without exhausting stack?!\n");
-- 
2.23.0.187.g17f5b7556c-goog