linux-kernel - Re: [RFC] taint/module: Fix problems when out-of-kernel driver defines true or false

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Date:   Tue, 03 Jan 2017 13:30:11 +1030
From:   Rusty Russell <rusty@...tcorp.com.au>
To:     Larry Finger <Larry.Finger@...inger.net>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     linux-kernel@...r.kernel.org, driver-devel@...r.kernel.org,
        Larry Finger <Larry.Finger@...inger.net>,
        Petr Mladek <pmladek@...e.com>, Jessica Yu <jeyu@...hat.com>
Subject: Re: [RFC] taint/module: Fix problems when out-of-kernel driver defines true or false

Larry Finger <Larry.Finger@...inger.net> writes:
> Commit 7fd8329ba502 ("taint/module: Clean up global and module taint
> flags handling") used the key words true and false as character members
> of a new struct. These names cause problems when out-of-kernel modules
> such as VirtualBox include their own definitions of true and false.
>
> Fixes: 7fd8329ba502 ("taint/module: Clean up global and module taint flags handling")
> Signed-off-by: Larry Finger <Larry.Finger@...inger.net>
> Cc: Petr Mladek <pmladek@...e.com>
> Cc: Jessica Yu <jeyu@...hat.com>
> Cc: Rusty Russell <rusty@...tcorp.com.au>

Acked-by: Rusty Russell <rusty@...tcorp.com.au>

Thanks,
Rusty.

> ---
>  include/linux/kernel.h | 4 ++--
>  kernel/module.c        | 2 +-
>  kernel/panic.c         | 2 +-
>  3 files changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/include/linux/kernel.h b/include/linux/kernel.h
> index 56aec84..cb09238 100644
> --- a/include/linux/kernel.h
> +++ b/include/linux/kernel.h
> @@ -514,8 +514,8 @@ extern enum system_states {
>  #define TAINT_FLAGS_COUNT		16
>  
>  struct taint_flag {
> -	char true;	/* character printed when tainted */
> -	char false;	/* character printed when not tainted */
> +	char c_true;	/* character printed when tainted */
> +	char c_false;	/* character printed when not tainted */
>  	bool module;	/* also show as a per-module taint flag */
>  };
>  
> diff --git a/kernel/module.c b/kernel/module.c
> index f7482db..5f7d482 100644
> --- a/kernel/module.c
> +++ b/kernel/module.c
> @@ -1145,7 +1145,7 @@ static size_t module_flags_taint(struct module *mod, char *buf)
>  
>  	for (i = 0; i < TAINT_FLAGS_COUNT; i++) {
>  		if (taint_flags[i].module && test_bit(i, &mod->taints))
> -			buf[l++] = taint_flags[i].true;
> +			buf[l++] = taint_flags[i].c_true;
>  	}
>  
>  	return l;
> diff --git a/kernel/panic.c b/kernel/panic.c
> index c51edaa..901c4fb 100644
> --- a/kernel/panic.c
> +++ b/kernel/panic.c
> @@ -355,7 +355,7 @@ const char *print_tainted(void)
>  		for (i = 0; i < TAINT_FLAGS_COUNT; i++) {
>  			const struct taint_flag *t = &taint_flags[i];
>  			*s++ = test_bit(i, &tainted_mask) ?
> -					t->true : t->false;
> +					t->c_true : t->c_false;
>  		}
>  		*s = 0;
>  	} else
> -- 
> 2.10.2