mirror of
https://github.com/torvalds/linux.git
synced 2024-12-21 02:21:36 +00:00
3c9c3902e3
list_for_each_entry is able to handle an empty list. The only effect of avoiding the loop is not initializing the index variable. Drop list_empty tests in cases where these variables are not used. Note that list_for_each_entry is defined in terms of list_first_entry, which indicates that it should not be used on an empty list. But in list_for_each_entry, the element obtained by list_first_entry is not really accessed, only the address of its list_head field is compared to the address of the list head, so the list_first_entry is safe. The semantic patch that makes this change 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 </smpl> Signed-off-by: Julia Lawall <Julia.Lawall@inria.fr> Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org> |
||
|---|---|---|
| .. | ||
| Kconfig | ||
| Makefile | ||
| tm6000-alsa.c | ||
| tm6000-cards.c | ||
| tm6000-core.c | ||
| tm6000-dvb.c | ||
| tm6000-i2c.c | ||
| tm6000-input.c | ||
| tm6000-regs.h | ||
| tm6000-stds.c | ||
| tm6000-usb-isoc.h | ||
| tm6000-video.c | ||
| tm6000.h | ||