[PATCH v2 3/3] lib/vsprintf: Declare no_hash_pointers in sprintf.h

From: Andy Shevchenko
Date: Sat Aug 05 2023 - 13:49:43 EST


Sparse is not happy to see non-static variable without declaration:
lib/vsprintf.c:61:6: warning: symbol 'no_hash_pointers' was not declared. Should it be static?

Declare respective variable in the sprintf.h. With this, add a comment
to discourage its use if no real need.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
---
include/linux/sprintf.h | 2 ++
lib/test_printf.c | 2 --
mm/kfence/report.c | 3 +--
3 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/include/linux/sprintf.h b/include/linux/sprintf.h
index 9ca23bcf9f42..33dcbec71925 100644
--- a/include/linux/sprintf.h
+++ b/include/linux/sprintf.h
@@ -20,6 +20,8 @@ __printf(2, 0) const char *kvasprintf_const(gfp_t gfp, const char *fmt, va_list
__scanf(2, 3) int sscanf(const char *, const char *, ...);
__scanf(2, 0) int vsscanf(const char *, const char *, va_list);

+/* These are for specific cases, do not use without real need */
+extern bool no_hash_pointers;
int no_hash_pointers_enable(char *str);

#endif /* _LINUX_KERNEL_SPRINTF_H */
diff --git a/lib/test_printf.c b/lib/test_printf.c
index 5adca19d34e2..cf861dc22169 100644
--- a/lib/test_printf.c
+++ b/lib/test_printf.c
@@ -39,8 +39,6 @@ KSTM_MODULE_GLOBALS();
static char *test_buffer __initdata;
static char *alloced_buffer __initdata;

-extern bool no_hash_pointers;
-
static int __printf(4, 0) __init
do_test(int bufsize, const char *expect, int elen,
const char *fmt, va_list ap)
diff --git a/mm/kfence/report.c b/mm/kfence/report.c
index 197430a5be4a..c509aed326ce 100644
--- a/mm/kfence/report.c
+++ b/mm/kfence/report.c
@@ -13,6 +13,7 @@
#include <linux/printk.h>
#include <linux/sched/debug.h>
#include <linux/seq_file.h>
+#include <linux/sprintf.h>
#include <linux/stacktrace.h>
#include <linux/string.h>
#include <trace/events/error_report.h>
@@ -26,8 +27,6 @@
#define ARCH_FUNC_PREFIX ""
#endif

-extern bool no_hash_pointers;
-
/* Helper function to either print to a seq_file or to console. */
__printf(2, 3)
static void seq_con_printf(struct seq_file *seq, const char *fmt, ...)
--
2.40.0.1.gaa8946217a0b