[patch 12/19] softirq: Add RT specific softirq accounting
From: Thomas Gleixner <hidden>
Date: 2020-11-13 14:25:10
Also in:
linux-sh, linux-um, lkml
RT requires the softirq to be preemptible and uses a per CPU local lock to protect BH disabled sections and softirq processing. Therefore RT cannot use the preempt counter to keep track of BH disabled/serving. Add a RT only counter to task struct and adjust the relevant macros in preempt.h. Signed-off-by: Thomas Gleixner <redacted> --- include/linux/hardirq.h | 1 + include/linux/preempt.h | 6 +++++- include/linux/sched.h | 3 +++ 3 files changed, 9 insertions(+), 1 deletion(-)
--- a/include/linux/hardirq.h
+++ b/include/linux/hardirq.h@@ -6,6 +6,7 @@ #include <linux/preempt.h> #include <linux/lockdep.h> #include <linux/ftrace_irq.h> +#include <linux/sched.h> #include <linux/vtime.h> #include <asm/hardirq.h> --- a/include/linux/preempt.h +++ b/include/linux/preempt.h
@@ -79,7 +79,11 @@ #define nmi_count() (preempt_count() & NMI_MASK) #define hardirq_count() (preempt_count() & HARDIRQ_MASK) -#define softirq_count() (preempt_count() & SOFTIRQ_MASK) +#ifdef CONFIG_PREEMPT_RT +# define softirq_count() (current->softirq_disable_cnt & SOFTIRQ_MASK) +#else +# define softirq_count() (preempt_count() & SOFTIRQ_MASK) +#endif #define irq_count() (nmi_count() | hardirq_count() | softirq_count()) /* --- a/include/linux/sched.h +++ b/include/linux/sched.h
@@ -1004,6 +1004,9 @@ struct task_struct { int softirq_context; int irq_config; #endif +#ifdef CONFIG_PREEMPT_RT + int softirq_disable_cnt; +#endif #ifdef CONFIG_LOCKDEP # define MAX_LOCK_DEPTH 48UL
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