From: Dan Gopstein <dgopst...@nyu.edu>
Replace usages of the locally defined ABS() macro with calls to the
canonical abs() from kernel.h and remove the old definitions of ABS()
This change was originally motivated by two local definitions of the
ABS (absolute value) macro that fail to parenthesize their parameter
properly. This can lead to a bad expansion for low-precedence
expression arguments.
For example: ABS(1-2) currently expands to ((1-2) < 0 ? (-1-2) : (1-2))
which evaluates to -3. But the correct expansion would be
((1-2) < 0 ? -(1-2) : (1-2)) which evaluates to 1.
Signed-off-by: Dan Gopstein <dgopst...@nyu.edu>
---
v3->v4:
* add original macro precednece problem description to commit text
v2->v3:
* replace local ABS() with kernel's abs()
v1->v2:
* unmangled the patch
* added example to commit text
drivers/media/dvb-frontends/dib0090.c | 4 ++--
drivers/media/dvb-frontends/dib7000p.c | 2 +-
drivers/media/dvb-frontends/dib8000.c | 2 +-
drivers/media/dvb-frontends/dibx000_common.h | 2 --
drivers/media/dvb-frontends/mb86a16.c | 8 +++-----
drivers/media/dvb-frontends/stv0367_priv.h | 1 -
drivers/media/dvb-frontends/stv0900_priv.h | 1 -
drivers/media/dvb-frontends/stv0900_sw.c | 6 +++---
8 files changed, 10 insertions(+), 16 deletions(-)
diff --git a/drivers/media/dvb-frontends/dib0090.c
b/drivers/media/dvb-frontends/dib0090.c
index d9d730d..633a961 100644
--- a/drivers/media/dvb-frontends/dib0090.c
+++ b/drivers/media/dvb-frontends/dib0090.c
@@ -1285,7 +1285,7 @@ int dib0090_gain_control(struct dvb_frontend *fe)
#endif
if (*tune_state == CT_AGC_STEP_1) { /* quickly go
to the correct range of the ADC power */
- if (ABS(adc_error) < 50 || state->agc_step++ >
5) {
+ if (abs(adc_error) < 50 || state->agc_step++ >
5) {
#ifdef CONFIG_STANDARD_DAB
if
(state->fe->dtv_property_cache.delivery_system == STANDARD_DAB) {
@@ -1754,7 +1754,7 @@ static int dib0090_dc_offset_calibration(struct
dib0090_state *state, enum front
*tune_state = CT_TUNER_STEP_1;
} else {
/* the minimum was what we have seen in the step before
*/
- if (ABS(state->adc_diff) > ABS(state->min_adc_diff)) {
+ if (abs(state->adc_diff) > abs(state->min_adc_diff)) {
dprintk("Since adc_diff N = %d > adc_diff step
N-1 = %d, Come back one step\n", state->adc_diff, state->min_adc_diff);
state->step--;
}
diff --git a/drivers/media/dvb-frontends/dib7000p.c
b/drivers/media/dvb-frontends/dib7000p.c
index 0fbaabe..6fc34b3 100644
--- a/drivers/media/dvb-frontends/dib7000p.c
+++ b/drivers/media/dvb-frontends/dib7000p.c
@@ -809,7 +809,7 @@ static int dib7000p_set_dds(struct dib7000p_state *state,
s32 offset_khz)
{
u32 internal = dib7000p_get_internal_freq(state);
s32 unit_khz_dds_val;
- u32 abs_offset_khz = ABS(offset_khz);
+ u32 abs_offset_khz = abs(offset_khz);
u32 dds = state->cfg.bw->ifreq & 0x1ffffff;
u8 invert = !!(state->cfg.bw->ifreq & (1 << 25));
if (internal == 0) {
diff --git a/drivers/media/dvb-frontends/dib8000.c
b/drivers/media/dvb-frontends/dib8000.c
index 5d93815..4680a8b 100644
--- a/drivers/media/dvb-frontends/dib8000.c
+++ b/drivers/media/dvb-frontends/dib8000.c
@@ -2677,7 +2677,7 @@ static void dib8000_viterbi_state(struct dib8000_state
*state, u8 onoff)
static void dib8000_set_dds(struct dib8000_state *state, s32 offset_khz)
{
s16 unit_khz_dds_val;
- u32 abs_offset_khz = ABS(offset_khz);
+ u32 abs_offset_khz = abs(offset_khz);
u32 dds = state->cfg.pll->ifreq & 0x1ffffff;
u8 invert = !!(state->cfg.pll->ifreq & (1 << 25));
u8 ratio;
diff --git a/drivers/media/dvb-frontends/dibx000_common.h
b/drivers/media/dvb-frontends/dibx000_common.h
index 8784af9..12b58f5 100644
--- a/drivers/media/dvb-frontends/dibx000_common.h
+++ b/drivers/media/dvb-frontends/dibx000_common.h
@@ -223,8 +223,6 @@ struct dvb_frontend_parametersContext {
#define FE_CALLBACK_TIME_NEVER 0xffffffff
-#define ABS(x) ((x < 0) ? (-x) : (x))
-
#define DATA_BUS_ACCESS_MODE_8BIT 0x01
#define DATA_BUS_ACCESS_MODE_16BIT 0x02
#define DATA_BUS_ACCESS_MODE_NO_ADDRESS_INCREMENT 0x10
diff --git a/drivers/media/dvb-frontends/mb86a16.c
b/drivers/media/dvb-frontends/mb86a16.c
index dfe322e..ced59f9 100644
--- a/drivers/media/dvb-frontends/mb86a16.c
+++ b/drivers/media/dvb-frontends/mb86a16.c
@@ -31,8 +31,6 @@
static unsigned int verbose = 5;
module_param(verbose, int, 0644);
-#define ABS(x) ((x) < 0 ? (-x) : (x))
-
struct mb86a16_state {
struct i2c_adapter *i2c_adap;
const struct mb86a16_config *config;
@@ -1201,12 +1199,12 @@ static int mb86a16_set_fe(struct mb86a16_state *state)
signal_dupl = 0;
for (j = 0; j < prev_freq_num; j++) {
- if ((ABS(prev_swp_freq[j] - swp_freq)) <
(swp_ofs * 3 / 2)) {
+ if ((abs(prev_swp_freq[j] - swp_freq)) <
(swp_ofs * 3 / 2)) {
signal_dupl = 1;
dprintk(verbose, MB86A16_INFO, 1,
"Probably Duplicate Signal, j = %d", j);
}
}
- if ((signal_dupl == 0) && (swp_freq > 0) &&
(ABS(swp_freq - state->frequency * 1000) < fcp + state->srate / 6)) {
+ if ((signal_dupl == 0) && (swp_freq > 0) &&
(abs(swp_freq - state->frequency * 1000) < fcp + state->srate / 6)) {
dprintk(verbose, MB86A16_DEBUG, 1, "------
Signal detect ------ [swp_freq=[%07d, srate=%05d]]", swp_freq, state->srate);
prev_swp_freq[prev_freq_num] = swp_freq;
prev_freq_num++;
@@ -1380,7 +1378,7 @@ static int mb86a16_set_fe(struct mb86a16_state *state)
dprintk(verbose, MB86A16_INFO, 1, "SWEEP Frequency =
%d", swp_freq);
swp_freq += delta_freq;
dprintk(verbose, MB86A16_INFO, 1, "Adjusting .., DELTA
Freq = %d, SWEEP Freq=%d", delta_freq, swp_freq);
- if (ABS(state->frequency * 1000 - swp_freq) > 3800) {
+ if (abs(state->frequency * 1000 - swp_freq) > 3800) {
dprintk(verbose, MB86A16_INFO, 1, "NO --
SIGNAL !");
} else {
diff --git a/drivers/media/dvb-frontends/stv0367_priv.h
b/drivers/media/dvb-frontends/stv0367_priv.h
index 8abc451..460066a 100644
--- a/drivers/media/dvb-frontends/stv0367_priv.h
+++ b/drivers/media/dvb-frontends/stv0367_priv.h
@@ -35,7 +35,6 @@
#endif
/* MACRO definitions */
-#define ABS(X) ((X) < 0 ? (-1 * (X)) : (X))
#define MAX(X, Y) ((X) >= (Y) ? (X) : (Y))
#define MIN(X, Y) ((X) <= (Y) ? (X) : (Y))
#define INRANGE(X, Y, Z) \
diff --git a/drivers/media/dvb-frontends/stv0900_priv.h
b/drivers/media/dvb-frontends/stv0900_priv.h
index 7a95f95..97c1237 100644
--- a/drivers/media/dvb-frontends/stv0900_priv.h
+++ b/drivers/media/dvb-frontends/stv0900_priv.h
@@ -24,7 +24,6 @@
#include <linux/i2c.h>
-#define ABS(X) ((X) < 0 ? (-1 * (X)) : (X))
#define INRANGE(X, Y, Z) ((((X) <= (Y)) && ((Y) <= (Z))) \
|| (((Z) <= (Y)) && ((Y) <= (X))) ? 1 : 0)
diff --git a/drivers/media/dvb-frontends/stv0900_sw.c
b/drivers/media/dvb-frontends/stv0900_sw.c
index c97a391..d406c83 100644
--- a/drivers/media/dvb-frontends/stv0900_sw.c
+++ b/drivers/media/dvb-frontends/stv0900_sw.c
@@ -1255,14 +1255,14 @@ fe_stv0900_signal_type stv0900_get_signal_params(struct
dvb_frontend *fe)
else
intp->freq[d] = stv0900_get_tuner_freq(fe);
- if (ABS(offsetFreq) <= ((intp->srch_range[d] / 2000) + 500))
+ if (abs(offsetFreq) <= ((intp->srch_range[d] / 2000) + 500))
range = STV0900_RANGEOK;
- else if (ABS(offsetFreq) <=
+ else if (abs(offsetFreq) <=
(stv0900_carrier_width(result->symbol_rate,
result->rolloff) / 2000))
range = STV0900_RANGEOK;
- } else if (ABS(offsetFreq) <= ((intp->srch_range[d] / 2000) + 500))
+ } else if (abs(offsetFreq) <= ((intp->srch_range[d] / 2000) + 500))
range = STV0900_RANGEOK;
dprintk("%s: range %d\n", __func__, range);
--
2.7.4
