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Subject[PATCH 0/7] drop unnecessary list_empty
Date
The various list iterators are able to handle an empty list.
The only effect of avoiding the loop is not initializing some
index variables.
Drop list_empty tests in cases where these variables are not
used.

The semantic patch that makes these changes is as follows:
(http://coccinelle.lip6.fr/)

<smpl>
@@
expression x,e;
iterator name list_for_each_entry;
statement S;
identifier i;
@@

-if (!(list_empty(x))) {
list_for_each_entry(i,x,...) S
- }
... when != i
? i = e

@@
expression x,e;
iterator name list_for_each_entry_safe;
statement S;
identifier i,j;
@@

-if (!(list_empty(x))) {
list_for_each_entry_safe(i,j,x,...) S
- }
... when != i
when != j
(
i = e;
|
? j = e;
)

@@
expression x,e;
iterator name list_for_each;
statement S;
identifier i;
@@

-if (!(list_empty(x))) {
list_for_each(i,x) S
- }
... when != i
? i = e

@@
expression x,e;
iterator name list_for_each_safe;
statement S;
identifier i,j;
@@

-if (!(list_empty(x))) {
list_for_each_safe(i,j,x) S
- }
... when != i
when != j
(
i = e;
|
? j = e;
)

// -------------------

@@
expression x,e;
statement S;
identifier i;
@@

-if (!(list_empty(x)))
list_for_each_entry(i,x,...) S
... when != i
? i = e

@@
expression x,e;
statement S;
identifier i,j;
@@

-if (!(list_empty(x)))
list_for_each_entry_safe(i,j,x,...) S
... when != i
when != j
(
i = e;
|
? j = e;
)

@@
expression x,e;
statement S;
identifier i;
@@

-if (!(list_empty(x)))
list_for_each(i,x) S
... when != i
? i = e

@@
expression x,e;
statement S;
identifier i,j;
@@

-if (!(list_empty(x)))
list_for_each_safe(i,j,x) S
... when != i
when != j
(
i = e;
|
? j = e;
)
</smpl>

---

drivers/media/pci/saa7134/saa7134-core.c | 14 ++---
drivers/media/usb/cx231xx/cx231xx-core.c | 16 ++----
drivers/media/usb/tm6000/tm6000-core.c | 24 +++-------
drivers/net/ethernet/mellanox/mlx5/core/steering/dr_matcher.c | 13 ++---
drivers/net/ethernet/mellanox/mlx5/core/steering/dr_rule.c | 5 --
drivers/net/ethernet/sfc/ptp.c | 20 +++-----
drivers/net/wireless/ath/dfs_pattern_detector.c | 15 ++----
sound/soc/intel/atom/sst/sst_loader.c | 10 +---
sound/soc/intel/skylake/skl-pcm.c | 8 +--
sound/soc/intel/skylake/skl-topology.c | 5 --
10 files changed, 53 insertions(+), 77 deletions(-)

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