Em Sat, Dec 08, 2007 at 10:06:25AM +0000, Gerrit Renker escreveu:
> This moves the inlines (which were previously declared as macros) back into
> packet_history.h since
> the loss detection code needs to be able to read entries from the RX history
> in order to create the
> relevant loss entries: it needs at least tfrc_rx_hist_loss_prev() and
> tfrc_rx_hist_last_rcv(), which
> in turn require the definition of the other inlines (macros).
>
> Additionally, inn one case the use of inlines instead of a macro broke the
> algorithm: rx_hist_swap()
> (introduced in next patch) needs to be able to swap the history entries; when
> using an inline returning
> a pointer instead, one gets compilation errors such as:
>
> distcc[24516] ERROR: compile
> /root/.ccache/packet_his.tmp.aspire.home.net.24512.i on _tiptop failed
> /usr/src/davem-2.6/net/dccp/ccids/lib/packet_history.c: In function
> '__one_after_loss':
> /usr/src/davem-2.6/net/dccp/ccids/lib/packet_history.c:266: error: lvalue
> required as unary '&' operand
> /usr/src/davem-2.6/net/dccp/ccids/lib/packet_history.c:267: error: lvalue
> required as unary '&' operand
> /usr/src/davem-2.6/net/dccp/ccids/lib/packet_history.c: In function
> '__two_after_loss':
> /usr/src/davem-2.6/net/dccp/ccids/lib/packet_history.c:298: error: lvalue
> required as unary '&' operand
> /usr/src/davem-2.6/net/dccp/ccids/lib/packet_history.c:299: error: lvalue
> required as unary '&' operand
> /usr/src/davem-2.6/net/dccp/ccids/lib/packet_history.c:336: error: lvalue
> required as unary '&' operand
> /usr/src/davem-2.6/net/dccp/ccids/lib/packet_history.c:337: error: lvalue
> required as unary '&' operand
> make[4]: *** [net/dccp/ccids/lib/packet_history.o] Error 1
> make[3]: *** [net/dccp/ccids/lib] Error 2
> make[2]: *** [net/dccp/ccids] Error 2
> make[1]: *** [net/dccp/] Error 2
> make: *** [sub-make] Error 2
Because you do it this way:
tfrc_rx_hist_swap(&TFRC_RX_HIST_ENTRY(h, 0), &TFRC_RX_HIST_ENTRY(h, 3));
I checked and at least in this patch series all uses are of this type,
so why not do it using just the indexes, which would be simpler:
tfrc_rx_hist_swap(h, 0, 3);
With this implementation:
static void tfrc_rx_hist_swap(struct tfrc_rx_hist *h, const int a, const int b)
{
const int idx_a = tfrc_rx_hist_index(h, a),
int idx_b = tfrc_rx_hist_index(h, b);
struct tfrc_rx_hist_entry *tmp = h->ring[idx_a];
h->ring[idx_a] = h->ring[idx_b];
h->ring[idx_b] = tmp;
}
- Arnaldo
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