bianbu-repo-mirror/bianbu-linux-6.6
1
0
Fork 0
mirror of https://gitee.com/bianbu-linux/linux-6.6 synced 2025-04-24 14:07:52 -04:00
Code Issues Projects Releases Packages Wiki Activity Actions

staging: lustre: add container_of_safe()

Browse source 
Luster has a container_of0() function which is similar to
container_of() but passes an IS_ERR_OR_NULL() pointer through
unchanged.
This could be generally useful: bcache at last has a similar function.

Naming is hard, but the precedent set by hlist_entry_safe() suggests
a _safe suffix might be most consistent.

So add container_of_safe() to kernel.h, and replace all occurrences of
container_of0() with one of
  - list_first_entry, list_next_entry, when that is a better fit,
  - container_of(), when the pointer is used as a validpointer in
    surrounding code,
  - container_of_safe() when there is no obviously better alternative.

Signed-off-by: NeilBrown <neilb@suse.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
NeilBrown 2018-03-29 15:26:48 +11:00 • committed by Greg Kroah-Hartman
parent 93aa2c2a50
commit 05e6557b8e
15 changed files with 53 additions and 48 deletions
Download patch file Download diff file Expand all files Collapse all files

16
include/linux/kernel.h
View file

@ -964,6 +964,22 @@ static inline void ftrace_dump(enum ftrace_dump_mode oops_dump_mode) { }
"pointer type mismatch in container_of()"); \
((type *)(__mptr - offsetof(type, member))); })
/**
* container_of_safe - cast a member of a structure out to the containing structure
* @ptr: the pointer to the member.
* @type: the type of the container struct this is embedded in.
* @member: the name of the member within the struct.
*
* If IS_ERR_OR_NULL(ptr), ptr is returned unchanged.
*/
#define container_of_safe(ptr, type, member) ({ \
void *__mptr = (void *)(ptr); \
BUILD_BUG_ON_MSG(!__same_type(*(ptr), ((type *)0)->member) && \
!__same_type(*(ptr), void), \
"pointer type mismatch in container_of()"); \
IS_ERR_OR_NULL(ptr) ? ERR_CAST(ptr) : \
((type *)(__mptr - offsetof(type, member))); })
/* Rebuild everything on CONFIG_FTRACE_MCOUNT_RECORD */
#ifdef CONFIG_FTRACE_MCOUNT_RECORD
# define REBUILD_DUE_TO_FTRACE_MCOUNT_RECORD