diff options
| author | David Howells <dhowells@redhat.com> | 2009-12-11 13:11:05 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2009-12-16 09:27:50 -0200 |
| commit | 3ab1b9cecdc6540a5b79500b1c10c4362a9cc5f1 (patch) | |
| tree | a9234df481a15630ab50f734a8a55db3310633ec /drivers/media/dvb/frontends/lgs8gxx.c | |
| parent | 5bf583473813530c1bf82051a35fac8d5045f4f7 (diff) | |
| download | lwn-3ab1b9cecdc6540a5b79500b1c10c4362a9cc5f1.tar.gz lwn-3ab1b9cecdc6540a5b79500b1c10c4362a9cc5f1.zip | |
V4L/DVB: lgs8gxx: Use shifts rather than multiply/divide when possible
If val is a u64, then following:
val *= (u64)1 << 32;
val /= (u64)1 << 32;
should surely be better represented as:
val <<= 32;
val >>= 32;
Especially as, for the division, the compiler might want to actually do a
division:
drivers/built-in.o: In function `lgs8gxx_get_afc_phase':
drivers/media/dvb/frontends/lgs8gxx.c:250: undefined reference to `__udivdi3'
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media/dvb/frontends/lgs8gxx.c')
| -rw-r--r-- | drivers/media/dvb/frontends/lgs8gxx.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/media/dvb/frontends/lgs8gxx.c b/drivers/media/dvb/frontends/lgs8gxx.c index eabcadc425d5..dee53960e7e8 100644 --- a/drivers/media/dvb/frontends/lgs8gxx.c +++ b/drivers/media/dvb/frontends/lgs8gxx.c @@ -199,7 +199,7 @@ static int lgs8gxx_set_if_freq(struct lgs8gxx_state *priv, u32 freq /*in kHz*/) val = freq; if (freq != 0) { - val *= (u64)1 << 32; + val <<= 32; if (if_clk != 0) do_div(val, if_clk); v32 = val & 0xFFFFFFFF; @@ -246,7 +246,7 @@ static int lgs8gxx_get_afc_phase(struct lgs8gxx_state *priv) val = v32; val *= priv->config->if_clk_freq; - val /= (u64)1 << 32; + val >>= 32; dprintk("AFC = %u kHz\n", (u32)val); return 0; } |