Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

bpf: smp_wmb before bpf_ringbuf really commit #7993

Open
wants to merge 1 commit into
base: bpf-next_base
Choose a base branch
from
+4 −0
Open

bpf: smp_wmb before bpf_ringbuf really commit #7993

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
4 changes: 4 additions & 0 deletions kernel/bpf/ringbuf.c
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -508,6 +508,10 @@ static void bpf_ringbuf_commit(void *sample, u64 flags, bool discard)
rec_pos = (void *)hdr - (void *)rb->data;
cons_pos = smp_load_acquire(&rb->consumer_pos) & rb->mask;

/* Make sure the modification of data is visible on other CPU's
* before consume the event
*/
smp_wmb();
if (flags & BPF_RB_FORCE_WAKEUP)
irq_work_queue(&rb->work);
else if (cons_pos == rec_pos && !(flags & BPF_RB_NO_WAKEUP))
Expand Down
Loading