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Subject[PATCH V7 3/4] softirq: Rewrite softirq processing loop
Date
From: jun qian <qianjun.kernel@gmail.com>

Simplify the softirq processing loop by using the bitmap APIs

Signed-off-by: jun qian <qianjun.kernel@gmail.com>
---
kernel/softirq.c | 16 ++++++----------
1 file changed, 6 insertions(+), 10 deletions(-)

diff --git a/kernel/softirq.c b/kernel/softirq.c
index 5a627cd..cbb59b5 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -260,9 +260,9 @@ asmlinkage __visible void __softirq_entry __do_softirq(void)
unsigned long old_flags = current->flags;
unsigned int max_restart = MAX_SOFTIRQ_RESTART;
struct softirq_action *h;
+ unsigned long pending;
+ unsigned int vec_nr;
bool in_hardirq;
- __u32 pending;
- int softirq_bit;

/*
* Mask out PF_MEMALLOC as the current task context is borrowed for the
@@ -283,15 +283,13 @@ asmlinkage __visible void __softirq_entry __do_softirq(void)

local_irq_enable();

- h = softirq_vec;
-
- while ((softirq_bit = ffs(pending))) {
- unsigned int vec_nr;
+ for_each_set_bit(vec_nr, &pending, NR_SOFTIRQS) {
int prev_count;

- h += softirq_bit - 1;
+ __clear_bit(vec_nr, &pending);
+
+ h = softirq_vec + vec_nr;

- vec_nr = h - softirq_vec;
prev_count = preempt_count();

kstat_incr_softirqs_this_cpu(vec_nr);
@@ -305,8 +303,6 @@ asmlinkage __visible void __softirq_entry __do_softirq(void)
prev_count, preempt_count());
preempt_count_set(prev_count);
}
- h++;
- pending >>= softirq_bit;
}

if (__this_cpu_read(ksoftirqd) == current)
--
1.8.3.1
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