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bpf: Retire rcu_trace_implies_rcu_gp() from local storage

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This assumption will always hold going forward, hence just remove the
various checks and assume it is true with a comment for the uninformed
reader.

Reviewed-by: Paul E. McKenney <paulmck@kernel.org>
Reviewed-by: Amery Hung <ameryhung@gmail.com>
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://lore.kernel.org/r/20260227224806.646888-5-memxor@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Kumar Kartikeya Dwivedi 2026-02-27 14:48:04 -08:00 • committed by Alexei Starovoitov
parent f41deee082
commit baa35b3cb6
1 changed files with 19 additions and 18 deletions
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37
kernel/bpf/bpf_local_storage.c
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@ -107,14 +107,12 @@ static void __bpf_local_storage_free_trace_rcu(struct rcu_head *rcu)
{
struct bpf_local_storage *local_storage;
/* If RCU Tasks Trace grace period implies RCU grace period, do
* kfree(), else do kfree_rcu().
/*
* RCU Tasks Trace grace period implies RCU grace period, do
* kfree() directly.
*/
local_storage = container_of(rcu, struct bpf_local_storage, rcu);
if (rcu_trace_implies_rcu_gp())
kfree(local_storage);
else
kfree_rcu(local_storage, rcu);
kfree(local_storage);
}
/* Handle use_kmalloc_nolock == false */
@ -138,10 +136,11 @@ static void bpf_local_storage_free_rcu(struct rcu_head *rcu)
static void bpf_local_storage_free_trace_rcu(struct rcu_head *rcu)
{
if (rcu_trace_implies_rcu_gp())
bpf_local_storage_free_rcu(rcu);
else
call_rcu(rcu, bpf_local_storage_free_rcu);
/*
* RCU Tasks Trace grace period implies RCU grace period, do
* kfree() directly.
*/
bpf_local_storage_free_rcu(rcu);
}
static void bpf_local_storage_free(struct bpf_local_storage *local_storage,
@ -182,10 +181,11 @@ static void __bpf_selem_free_rcu(struct rcu_head *rcu)
/* rcu tasks trace callback for use_kmalloc_nolock == false */
static void __bpf_selem_free_trace_rcu(struct rcu_head *rcu)
{
if (rcu_trace_implies_rcu_gp())
__bpf_selem_free_rcu(rcu);
else
call_rcu(rcu, __bpf_selem_free_rcu);
/*
* RCU Tasks Trace grace period implies RCU grace period, do
* kfree() directly.
*/
__bpf_selem_free_rcu(rcu);
}
/* Handle use_kmalloc_nolock == false */
@ -214,10 +214,11 @@ static void bpf_selem_free_rcu(struct rcu_head *rcu)
static void bpf_selem_free_trace_rcu(struct rcu_head *rcu)
{
if (rcu_trace_implies_rcu_gp())
bpf_selem_free_rcu(rcu);
else
call_rcu(rcu, bpf_selem_free_rcu);
/*
* RCU Tasks Trace grace period implies RCU grace period, do
* kfree() directly.
*/
bpf_selem_free_rcu(rcu);
}
void bpf_selem_free(struct bpf_local_storage_elem *selem,