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| author |   Davidlohr Bueso <dave@stgolabs.net> | 2018-03-26 14:09:24 -0700 |
|---|---|---|
| committer |   Wolfram Sang <wsa@the-dreams.de> | 2018-04-03 19:20:26 +0200 |
| commit | 50888b015d1318a5d76c961f80bab79249cb1000 (patch) | |
| tree | 60f01ea5e5338572868357b7bacc861509e632a7 /drivers/i2c | |
| parent | i2c: fix parameter of trace_i2c_result (diff) | |
| download | linux-dev-50888b015d1318a5d76c961f80bab79249cb1000.tar.xz linux-dev-50888b015d1318a5d76c961f80bab79249cb1000.zip | |
i2c: Update i2c_trace_msg static key to modern api
No changes in refcount semantics -- key init is false; replace
static_key_slow_inc|dec with static_branch_inc|dec
static_key_false with static_branch_unlikely
Added a '_key' suffix to i2c_trace_msg, for better self
documentation.
Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Reviewed-by: David Howells <dhowells@redhat.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/i2c-core-base.c | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c index a7909d196f4c..1adeebaa81b0 100644 --- a/drivers/i2c/i2c-core-base.c +++ b/drivers/i2c/i2c-core-base.c @@ -69,18 +69,18 @@ static DEFINE_IDR(i2c_adapter_idr); static int i2c_detect(struct i2c_adapter *adapter, struct i2c_driver *driver); -static struct static_key i2c_trace_msg = STATIC_KEY_INIT_FALSE; +static DEFINE_STATIC_KEY_FALSE(i2c_trace_msg_key); static bool is_registered; int i2c_transfer_trace_reg(void) { - static_key_slow_inc(&i2c_trace_msg); + static_branch_inc(&i2c_trace_msg_key); return 0; } void i2c_transfer_trace_unreg(void) { - static_key_slow_dec(&i2c_trace_msg); + static_branch_dec(&i2c_trace_msg_key); } const struct i2c_device_id *i2c_match_id(const struct i2c_device_id *id, @@ -1848,11 +1848,12 @@ int __i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num) if (adap->quirks && i2c_check_for_quirks(adap, msgs, num)) return -EOPNOTSUPP; - /* i2c_trace_msg gets enabled when tracepoint i2c_transfer gets + /* + * i2c_trace_msg_key gets enabled when tracepoint i2c_transfer gets * enabled. This is an efficient way of keeping the for-loop from * being executed when not needed. */ - if (static_key_false(&i2c_trace_msg)) { + if (static_branch_unlikely(&i2c_trace_msg_key)) { int i; for (i = 0; i < num; i++) if (msgs[i].flags & I2C_M_RD) @@ -1871,7 +1872,7 @@ int __i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num) break; } - if (static_key_false(&i2c_trace_msg)) { + if (static_branch_unlikely(&i2c_trace_msg_key)) { int i; for (i = 0; i < ret; i++) if (msgs[i].flags & I2C_M_RD) |