A-Team_Digital_Solutions/android_kernel_motorola_sm6375
Watch
2
0
Fork
You've already forked android_kernel_motorola_sm6375
 0
mirror of https://github.com/BobTheBlinker/android_kernel_motorola_sm6375.git synced 2026-10-11 15:11:48 -04:00
Code Issues Projects Releases Packages Wiki Activity

UPSTREAM: bpf: Introducte bpf_this_cpu_ptr()

Browse source 
Add bpf_this_cpu_ptr() to help access percpu var on this cpu. This
helper always returns a valid pointer, therefore no need to check
returned value for NULL. Also note that all programs run with
preemption disabled, which means that the returned pointer is stable
during all the execution of the program.

Change-Id: I5a21c27796380af29fecd9f5650946e7477a1c30
Signed-off-by: Hao Luo <haoluo@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/20200929235049.2533242-6-haoluo@google.com
This commit is contained in:
Hao Luo 2020-09-29 16:50:48 -07:00 • committed by basamaryan
commit ca55a79f0d
No known key found for this signature in database
GPG key ID: 210D5384FB2A5885
6 changed files with 52 additions and 3 deletions
Download patch file Download diff file Expand all files Collapse all files

13
include/uapi/linux/bpf.h
View file

@ -3713,6 +3713,18 @@ union bpf_attr {
* Return
* A pointer pointing to the kernel percpu variable on *cpu*, or
* NULL, if *cpu* is invalid.
*
* void *bpf_this_cpu_ptr(const void *percpu_ptr)
* Description
* Take a pointer to a percpu ksym, *percpu_ptr*, and return a
* pointer to the percpu kernel variable on this cpu. See the
* description of 'ksym' in **bpf_per_cpu_ptr**\ ().
*
* bpf_this_cpu_ptr() has the same semantic as this_cpu_ptr() in
* the kernel. Different from **bpf_per_cpu_ptr**\ (), it would
* never return NULL.
* Return
* A pointer pointing to the kernel percpu variable on this cpu.
*/
#define __BPF_FUNC_MAPPER(FN) \
FN(unspec), \
@ -3869,6 +3881,7 @@ union bpf_attr {
FN(skb_cgroup_classid), \
FN(redirect_neigh), \
FN(bpf_per_cpu_ptr), \
FN(bpf_this_cpu_ptr), \
/* */
/* integer value in 'imm' field of BPF_CALL instruction selects which helper