Arnd,
On Thu, Apr 25, 2013 at 1:28 PM, Arnd Bergmann <a...@arndb.de> wrote:
> The newly rewritten get_property() function causes a bogus warning
> from gcc-3.8, which cannot figure out that "level" is always
> initialized at the point where it gets evaluated:
>
> drivers/thermal/cpu_cooling.c: In function 'get_property':
> drivers/thermal/cpu_cooling.c:189:37: warning: 'level' may be used
> uninitialized in this function [-Wmaybe-uninitialized]
> if (property == GET_FREQ && level == j) {
> ^
>
> Slightly rearranging the code makes this more obvious and
> avoids the warning.
>
> Signed-off-by: Arnd Bergmann <a...@arndb.de>
> Cc: Zhang Rui <rui.zh...@intel.com>
> Cc: Amit Daniel kachhap <amit.dan...@samsung.com>
Rui has merged a patch that removes this bogus compiler warning:
http://git.kernel.org/cgit/linux/kernel/git/rzhang/linux.git/commit/?h=next&id=4469b99743d296e24aefc5f8ed7df1bc9cfbbac8
Though, as not as elegant as your patch, it does the trick. :-)
> ---
> drivers/thermal/cpu_cooling.c | 17 +++++++++--------
> 1 file changed, 9 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/thermal/cpu_cooling.c b/drivers/thermal/cpu_cooling.c
> index 768b508..34878e6 100644
> --- a/drivers/thermal/cpu_cooling.c
> +++ b/drivers/thermal/cpu_cooling.c
> @@ -165,10 +165,6 @@ static int get_property(unsigned int cpu, unsigned long
> input,
> return 0;
> }
>
> - if (property == GET_FREQ)
> - level = descend ? input : (max_level - input -1);
> -
> -
> for (i = 0, j = 0; table[i].frequency != CPUFREQ_TABLE_END; i++) {
> /* ignore invalid entry */
> if (table[i].frequency == CPUFREQ_ENTRY_INVALID)
> @@ -186,10 +182,15 @@ static int get_property(unsigned int cpu, unsigned long
> input,
> *output = descend ? j : (max_level - j - 1);
> return 0;
> }
> - if (property == GET_FREQ && level == j) {
> - /* get frequency by level */
> - *output = freq;
> - return 0;
> +
> + if (property == GET_FREQ) {
> + level = descend ? input : (max_level - input -1);
> +
> + if (level == j) {
> + /* get frequency by level */
> + *output = freq;
> + return 0;
> + }
> }
> j++;
> }
> --
> 1.8.1.2
>
> --
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--
Eduardo Bezerra Valentin
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