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From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Tue, 22 Aug 2023 18:14:44 +0200
Subject: [PATCH 09/15] dev: Remove PREEMPT_RT ifdefs from backlog_lock.*().
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/6.10/older/patches-6.10.2-rt14.tar.xz
The backlog_napi locking (previously RPS) relies on explicit locking if
either RPS or backlog NAPI is enabled. If both are disabled then locking
was achieved by disabling interrupts except on PREEMPT_RT. PREEMPT_RT
was excluded because the needed synchronisation was already provided
local_bh_disable().
Since the introduction of backlog NAPI and making it mandatory for
PREEMPT_RT the ifdef within backlog_lock.*() is obsolete and can be
removed.
Remove the ifdefs in backlog_lock.*().
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
net/core/dev.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -229,7 +229,7 @@ static inline void backlog_lock_irq_save
{
if (IS_ENABLED(CONFIG_RPS) || use_backlog_threads())
spin_lock_irqsave(&sd->input_pkt_queue.lock, *flags);
- else if (!IS_ENABLED(CONFIG_PREEMPT_RT))
+ else
local_irq_save(*flags);
}
@@ -237,7 +237,7 @@ static inline void backlog_lock_irq_disa
{
if (IS_ENABLED(CONFIG_RPS) || use_backlog_threads())
spin_lock_irq(&sd->input_pkt_queue.lock);
- else if (!IS_ENABLED(CONFIG_PREEMPT_RT))
+ else
local_irq_disable();
}
@@ -246,7 +246,7 @@ static inline void backlog_unlock_irq_re
{
if (IS_ENABLED(CONFIG_RPS) || use_backlog_threads())
spin_unlock_irqrestore(&sd->input_pkt_queue.lock, *flags);
- else if (!IS_ENABLED(CONFIG_PREEMPT_RT))
+ else
local_irq_restore(*flags);
}
@@ -254,7 +254,7 @@ static inline void backlog_unlock_irq_en
{
if (IS_ENABLED(CONFIG_RPS) || use_backlog_threads())
spin_unlock_irq(&sd->input_pkt_queue.lock);
- else if (!IS_ENABLED(CONFIG_PREEMPT_RT))
+ else
local_irq_enable();
}
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