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 <[email protected]>
---
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
On Sat, 5 Aug 2023 at 19:49, Andy Shevchenko
<[email protected]> wrote:
>
> 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 <[email protected]>
Acked-by: Marco Elver <[email protected]>
> ---
> 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
>
> --
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On Sat 2023-08-05 20:50:27, Andy Shevchenko wrote:
> 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 <[email protected]>
> ---
> include/linux/sprintf.h | 2 ++
> lib/test_printf.c | 2 --
> mm/kfence/report.c | 3 +--
If we agreed to move sprintf() declarations into printk.h
then this might go to printk.h as well.
Best Regards,
Petr
On Mon, Aug 07, 2023 at 05:06:33PM +0200, Petr Mladek wrote:
> On Sat 2023-08-05 20:50:27, Andy Shevchenko wrote:
> > 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.
> If we agreed to move sprintf() declarations into printk.h
> then this might go to printk.h as well.
Sure, but I disagree with printk.h approach (as I explained why in the reply
to the suggestion).
--
With Best Regards,
Andy Shevchenko