Antonio Quartulli wrote: > smallest_signed_int(), seq_before() and seq_after() are very useful > functions that help to handle comparisons between sequence numbers. > However they were only defined in vis.c. With this patch every > batman-adv function will be able to use them. > > Signed-off-by: Antonio Quartulli <[email protected]>
Acked-by: Sven Eckelmann <[email protected]> David S. Miller doesn't want to have the seq_before/seq_after in a global header: http://lkml.org/lkml/2011/5/19/88 I would still like to propose the type check on top of that patch Kind regards, Sven > --- > main.h | 16 ++++++++++++++++ > vis.c | 16 ---------------- > 2 files changed, 16 insertions(+), 16 deletions(-) > > diff --git a/main.h b/main.h > index 3ca3941..90db244 100644 > --- a/main.h > +++ b/main.h > @@ -181,4 +181,20 @@ static inline int compare_eth(void *data1, void > *data2) > > #define atomic_dec_not_zero(v) atomic_add_unless((v), -1, 0) > > +/* Returns the smallest signed integer in two's complement with the sizeof > x */ +#define smallest_signed_int(x) (1u << (7u + 8u * (sizeof(x) - 1u))) > + > +/* Checks if a sequence number x is a predecessor/successor of y. > + * they handle overflows/underflows and can correctly check for a > + * predecessor/successor unless the variable sequence number has grown by > + * more then 2**(bitwidth(x)-1)-1. > + * This means that for a uint8_t with the maximum value 255, it would > think: + * - when adding nothing - it is neither a predecessor nor a > successor + * - before adding more than 127 to the starting value - it is > a predecessor, + * - when adding 128 - it is neither a predecessor nor a > successor, + * - after adding more than 127 to the starting value - it is > a successor */ +#define seq_before(x, y) ({typeof(x) _dummy = (x - y); \ > + _dummy > smallest_signed_int(_dummy); }) > +#define seq_after(x, y) seq_before(y, x) > + > #endif /* _NET_BATMAN_ADV_MAIN_H_ */ > diff --git a/vis.c b/vis.c > index c39f20c..e1ed552 100644 > --- a/vis.c > +++ b/vis.c > @@ -30,22 +30,6 @@ > > #define MAX_VIS_PACKET_SIZE 1000 > > -/* Returns the smallest signed integer in two's complement with the sizeof > x */ -#define smallest_signed_int(x) (1u << (7u + 8u * (sizeof(x) - 1u))) > - > -/* Checks if a sequence number x is a predecessor/successor of y. > - * they handle overflows/underflows and can correctly check for a > - * predecessor/successor unless the variable sequence number has grown by > - * more then 2**(bitwidth(x)-1)-1. > - * This means that for a uint8_t with the maximum value 255, it would > think: - * - when adding nothing - it is neither a predecessor nor a > successor - * - before adding more than 127 to the starting value - it is > a predecessor, - * - when adding 128 - it is neither a predecessor nor a > successor, - * - after adding more than 127 to the starting value - it is > a successor */ -#define seq_before(x, y) ({typeof(x) _dummy = (x - y); \ > - _dummy > smallest_signed_int(_dummy); }) > -#define seq_after(x, y) seq_before(y, x) > - > static void start_vis_timer(struct bat_priv *bat_priv); > > /* free the info */
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