linux-kernel - Re: [PATCH v2 3/3] lib/vsprintf: Declare no_hash

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Date:   Mon, 7 Aug 2023 08:00:00 +0200
From:   Marco Elver <elver@...gle.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Petr Mladek <pmladek@...e.com>, linux-kernel@...r.kernel.org,
        kasan-dev@...glegroups.com, linux-mm@...ck.org,
        Steven Rostedt <rostedt@...dmis.org>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v2 3/3] lib/vsprintf: Declare no_hash_pointers in sprintf.h

On Sat, 5 Aug 2023 at 19:49, Andy Shevchenko
<andriy.shevchenko@...ux.intel.com> 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 <andriy.shevchenko@...ux.intel.com>

Acked-by: Marco Elver <elver@...gle.com>

> ---
>  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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