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From: Alexei Starovoitov <alexei.starovoitov@gmail.com>
To: davem@davemloft.net
Cc: daniel@iogearbox.net, andrii@kernel.org, netdev@vger.kernel.org,
	bpf@vger.kernel.org, kernel-team@fb.com
Subject: [PATCH v7 bpf-next 02/11] bpf: Factor out bpf_spin_lock into helpers.
Date: Wed, 14 Jul 2021 17:54:08 -0700	[thread overview]
Message-ID: <20210715005417.78572-3-alexei.starovoitov@gmail.com> (raw)
In-Reply-To: <20210715005417.78572-1-alexei.starovoitov@gmail.com>

From: Alexei Starovoitov <ast@kernel.org>

Move ____bpf_spin_lock/unlock into helpers to make it more clear
that quadruple underscore bpf_spin_lock/unlock are irqsave/restore variants.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
---
 kernel/bpf/helpers.c | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/kernel/bpf/helpers.c b/kernel/bpf/helpers.c
index 62cf00383910..38be3cfc2f58 100644
--- a/kernel/bpf/helpers.c
+++ b/kernel/bpf/helpers.c
@@ -289,13 +289,18 @@ static inline void __bpf_spin_unlock(struct bpf_spin_lock *lock)
 
 static DEFINE_PER_CPU(unsigned long, irqsave_flags);
 
-notrace BPF_CALL_1(bpf_spin_lock, struct bpf_spin_lock *, lock)
+static inline void __bpf_spin_lock_irqsave(struct bpf_spin_lock *lock)
 {
 	unsigned long flags;
 
 	local_irq_save(flags);
 	__bpf_spin_lock(lock);
 	__this_cpu_write(irqsave_flags, flags);
+}
+
+notrace BPF_CALL_1(bpf_spin_lock, struct bpf_spin_lock *, lock)
+{
+	__bpf_spin_lock_irqsave(lock);
 	return 0;
 }
 
@@ -306,13 +311,18 @@ const struct bpf_func_proto bpf_spin_lock_proto = {
 	.arg1_type	= ARG_PTR_TO_SPIN_LOCK,
 };
 
-notrace BPF_CALL_1(bpf_spin_unlock, struct bpf_spin_lock *, lock)
+static inline void __bpf_spin_unlock_irqrestore(struct bpf_spin_lock *lock)
 {
 	unsigned long flags;
 
 	flags = __this_cpu_read(irqsave_flags);
 	__bpf_spin_unlock(lock);
 	local_irq_restore(flags);
+}
+
+notrace BPF_CALL_1(bpf_spin_unlock, struct bpf_spin_lock *, lock)
+{
+	__bpf_spin_unlock_irqrestore(lock);
 	return 0;
 }
 
@@ -333,9 +343,9 @@ void copy_map_value_locked(struct bpf_map *map, void *dst, void *src,
 	else
 		lock = dst + map->spin_lock_off;
 	preempt_disable();
-	____bpf_spin_lock(lock);
+	__bpf_spin_lock_irqsave(lock);
 	copy_map_value(map, dst, src);
-	____bpf_spin_unlock(lock);
+	__bpf_spin_unlock_irqrestore(lock);
 	preempt_enable();
 }
 
-- 
2.30.2


  parent reply	other threads:[~2021-07-15  0:54 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-15  0:54 [PATCH v7 bpf-next 00/11] bpf: Introduce BPF timers Alexei Starovoitov
2021-07-15  0:54 ` [PATCH v7 bpf-next 01/11] bpf: Prepare bpf_prog_put() to be called from irq context Alexei Starovoitov
2021-07-15  0:54 ` Alexei Starovoitov [this message]
2021-07-15  0:54 ` [PATCH v7 bpf-next 03/11] bpf: Introduce bpf timers Alexei Starovoitov
2021-07-15  0:54 ` [PATCH v7 bpf-next 04/11] bpf: Add map side support for " Alexei Starovoitov
2021-07-15  0:54 ` [PATCH v7 bpf-next 05/11] bpf: Prevent pointer mismatch in bpf_timer_init Alexei Starovoitov
2021-07-15  0:54 ` [PATCH v7 bpf-next 06/11] bpf: Remember BTF of inner maps Alexei Starovoitov
2021-07-15  0:54 ` [PATCH v7 bpf-next 07/11] bpf: Relax verifier recursion check Alexei Starovoitov
2021-07-15  0:54 ` [PATCH v7 bpf-next 08/11] bpf: Implement verifier support for validation of async callbacks Alexei Starovoitov
2022-01-04 17:15   ` Kris Van Hees
2022-01-04 18:19     ` Alexei Starovoitov
2021-07-15  0:54 ` [PATCH v7 bpf-next 09/11] bpf: Teach stack depth check about " Alexei Starovoitov
2021-07-15  0:54 ` [PATCH v7 bpf-next 10/11] selftests/bpf: Add bpf_timer test Alexei Starovoitov
2021-07-15  0:54 ` [PATCH v7 bpf-next 11/11] selftests/bpf: Add a test with bpf_timer in inner map Alexei Starovoitov
2021-07-15 20:40 ` [PATCH v7 bpf-next 00/11] bpf: Introduce BPF timers patchwork-bot+netdevbpf

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