diff mbox series

[RESEND,bpf-next,2/2] bpf: Use GFP_KERNEL in bpf_event_entry_gen()

Message ID 20231208103357.2637299-3-houtao@huaweicloud.com (mailing list archive)
State Superseded
Delegated to: BPF
Headers show
Series bpf: Use GFP_KERNEL in bpf_event_entry_gen() | expand

Checks

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bpf/vmtest-bpf-next-PR success PR summary
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netdev/tree_selection success Clearly marked for bpf-next
netdev/ynl success SINGLE THREAD; Generated files up to date; no warnings/errors; no diff in generated;
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 1120 this patch: 1120
netdev/cc_maintainers success CCed 12 of 12 maintainers
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netdev/deprecated_api success None detected
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netdev/verify_fixes success No Fixes tag
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Commit Message

Hou Tao Dec. 8, 2023, 10:33 a.m. UTC 
From: Hou Tao <houtao1@huawei.com>

rcu_read_lock() is no longer held when invoking bpf_event_entry_gen()
which is called by perf_event_fd_array_get_ptr(), so using GFP_KERNEL
instead of GFP_ATOMIC to reduce the possibility of failures due to
out-of-memory.

Signed-off-by: Hou Tao <houtao1@huawei.com>
---
 kernel/bpf/arraymap.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Comments

Yonghong Song Dec. 8, 2023, 6:01 p.m. UTC | #1 
On 12/8/23 2:33 AM, Hou Tao wrote:
> From: Hou Tao <houtao1@huawei.com>
>
> rcu_read_lock() is no longer held when invoking bpf_event_entry_gen()
> which is called by perf_event_fd_array_get_ptr(), so using GFP_KERNEL
> instead of GFP_ATOMIC to reduce the possibility of failures due to
> out-of-memory.
>
> Signed-off-by: Hou Tao <houtao1@huawei.com>

Acked-by: Yonghong Song <yonghong.song@linux.dev>
diff mbox series

Patch

diff --git a/kernel/bpf/arraymap.c b/kernel/bpf/arraymap.c
index 4a4a67956e21..bac7420b29c7 100644
--- a/kernel/bpf/arraymap.c
+++ b/kernel/bpf/arraymap.c
@@ -1195,7 +1195,7 @@  static struct bpf_event_entry *bpf_event_entry_gen(struct file *perf_file,
 {
 	struct bpf_event_entry *ee;
 
-	ee = kzalloc(sizeof(*ee), GFP_ATOMIC);
+	ee = kzalloc(sizeof(*ee), GFP_KERNEL);
 	if (ee) {
 		ee->event = perf_file->private_data;
 		ee->perf_file = perf_file;