linux-kernel - Re: [PATCH 4.4 054/108] mtd: cfi: convert inline functions to macros

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Date:   Mon, 05 Mar 2018 02:22:52 +0000
From:   Ben Hutchings <ben.hutchings@...ethink.co.uk>
To:     Arnd Bergmann <arnd@...db.de>, Richard Weinberger <richard@....at>,
        Boris Brezillon <boris.brezillon@...e-electrons.com>
Cc:     stable@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4.4 054/108] mtd: cfi: convert inline functions to macros

On Thu, 2018-02-15 at 16:16 +0100, Greg Kroah-Hartman wrote:
> 4.4-stable review patch.  If anyone has any objections, please let me know.
> 
> ------------------
> 
> From: Arnd Bergmann <arnd@...db.de>
> 
> commit 9e343e87d2c4c707ef8fae2844864d4dde3a2d13 upstream.
[...]
> -static inline int map_word_andequal(struct map_info *map, map_word val1, map_word val2, map_word val3)
> -{
> -	int i;
> -
> -	for (i = 0; i < map_words(map); i++) {
> -		if ((val1.x[i] & val2.x[i]) != val3.x[i])
> -			return 0;
> -	}
> -
> -	return 1;
> -}
[...]
> +#define map_word_andequal(map, val1, val2, val3)			\
> +({									\
> +	int i, ret = 1;							\
> +	for (i = 0; i < map_words(map); i++) {				\
> +		if (((val1).x[i] & (val2).x[i]) != (val2).x[i]) {	\
[...]

The right-hand side of this comparison is now using val2 instead of
val3.  (This bug seems to be unfixed upstream.)

Ben.

-- 
Ben Hutchings
Software Developer, Codethink Ltd.