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author | 2023-03-18 10:52:48 -0700 | |
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committer | 2023-04-04 08:37:02 -0700 | |
commit | 6c366522e10f2b5e916b3f08ac042df1a1cd512a (patch) | |
tree | b7cdab38595d08920fc641919f5c2a3e23598175 /kernel/rcu | |
parent | srcu: Fix long lines in cleanup_srcu_struct() (diff) | |
download | linux-6c366522e10f2b5e916b3f08ac042df1a1cd512a.tar.gz linux-6c366522e10f2b5e916b3f08ac042df1a1cd512a.tar.bz2 linux-6c366522e10f2b5e916b3f08ac042df1a1cd512a.zip |
srcu: Fix long lines in srcu_gp_end()
This commit creates an srcu_usage pointer named "sup" as a shorter
synonym for the "ssp->srcu_sup" that was bloating several lines of code.
Cc: Christoph Hellwig <hch@lst.de>
Tested-by: Sachin Sant <sachinp@linux.ibm.com>
Tested-by: "Zhang, Qiang1" <qiang1.zhang@intel.com>
Tested-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'kernel/rcu')
-rw-r--r-- | kernel/rcu/srcutree.c | 41 |
1 files changed, 21 insertions, 20 deletions
diff --git a/kernel/rcu/srcutree.c b/kernel/rcu/srcutree.c index 11a08201ca0a..f661a0f6bc0d 100644 --- a/kernel/rcu/srcutree.c +++ b/kernel/rcu/srcutree.c @@ -862,28 +862,29 @@ static void srcu_gp_end(struct srcu_struct *ssp) unsigned long sgsne; struct srcu_node *snp; int ss_state; + struct srcu_usage *sup = ssp->srcu_sup; /* Prevent more than one additional grace period. */ - mutex_lock(&ssp->srcu_sup->srcu_cb_mutex); + mutex_lock(&sup->srcu_cb_mutex); /* End the current grace period. */ - spin_lock_irq_rcu_node(ssp->srcu_sup); - idx = rcu_seq_state(ssp->srcu_sup->srcu_gp_seq); + spin_lock_irq_rcu_node(sup); + idx = rcu_seq_state(sup->srcu_gp_seq); WARN_ON_ONCE(idx != SRCU_STATE_SCAN2); - if (ULONG_CMP_LT(READ_ONCE(ssp->srcu_sup->srcu_gp_seq), READ_ONCE(ssp->srcu_sup->srcu_gp_seq_needed_exp))) + if (ULONG_CMP_LT(READ_ONCE(sup->srcu_gp_seq), READ_ONCE(sup->srcu_gp_seq_needed_exp))) cbdelay = 0; - WRITE_ONCE(ssp->srcu_sup->srcu_last_gp_end, ktime_get_mono_fast_ns()); - rcu_seq_end(&ssp->srcu_sup->srcu_gp_seq); - gpseq = rcu_seq_current(&ssp->srcu_sup->srcu_gp_seq); - if (ULONG_CMP_LT(ssp->srcu_sup->srcu_gp_seq_needed_exp, gpseq)) - WRITE_ONCE(ssp->srcu_sup->srcu_gp_seq_needed_exp, gpseq); - spin_unlock_irq_rcu_node(ssp->srcu_sup); - mutex_unlock(&ssp->srcu_sup->srcu_gp_mutex); + WRITE_ONCE(sup->srcu_last_gp_end, ktime_get_mono_fast_ns()); + rcu_seq_end(&sup->srcu_gp_seq); + gpseq = rcu_seq_current(&sup->srcu_gp_seq); + if (ULONG_CMP_LT(sup->srcu_gp_seq_needed_exp, gpseq)) + WRITE_ONCE(sup->srcu_gp_seq_needed_exp, gpseq); + spin_unlock_irq_rcu_node(sup); + mutex_unlock(&sup->srcu_gp_mutex); /* A new grace period can start at this point. But only one. */ /* Initiate callback invocation as needed. */ - ss_state = smp_load_acquire(&ssp->srcu_sup->srcu_size_state); + ss_state = smp_load_acquire(&sup->srcu_size_state); if (ss_state < SRCU_SIZE_WAIT_BARRIER) { srcu_schedule_cbs_sdp(per_cpu_ptr(ssp->sda, get_boot_cpu_id()), cbdelay); @@ -892,7 +893,7 @@ static void srcu_gp_end(struct srcu_struct *ssp) srcu_for_each_node_breadth_first(ssp, snp) { spin_lock_irq_rcu_node(snp); cbs = false; - last_lvl = snp >= ssp->srcu_sup->level[rcu_num_lvls - 1]; + last_lvl = snp >= sup->level[rcu_num_lvls - 1]; if (last_lvl) cbs = ss_state < SRCU_SIZE_BIG || snp->srcu_have_cbs[idx] == gpseq; snp->srcu_have_cbs[idx] = gpseq; @@ -924,18 +925,18 @@ static void srcu_gp_end(struct srcu_struct *ssp) } /* Callback initiation done, allow grace periods after next. */ - mutex_unlock(&ssp->srcu_sup->srcu_cb_mutex); + mutex_unlock(&sup->srcu_cb_mutex); /* Start a new grace period if needed. */ - spin_lock_irq_rcu_node(ssp->srcu_sup); - gpseq = rcu_seq_current(&ssp->srcu_sup->srcu_gp_seq); + spin_lock_irq_rcu_node(sup); + gpseq = rcu_seq_current(&sup->srcu_gp_seq); if (!rcu_seq_state(gpseq) && - ULONG_CMP_LT(gpseq, ssp->srcu_sup->srcu_gp_seq_needed)) { + ULONG_CMP_LT(gpseq, sup->srcu_gp_seq_needed)) { srcu_gp_start(ssp); - spin_unlock_irq_rcu_node(ssp->srcu_sup); + spin_unlock_irq_rcu_node(sup); srcu_reschedule(ssp, 0); } else { - spin_unlock_irq_rcu_node(ssp->srcu_sup); + spin_unlock_irq_rcu_node(sup); } /* Transition to big if needed. */ @@ -943,7 +944,7 @@ static void srcu_gp_end(struct srcu_struct *ssp) if (ss_state == SRCU_SIZE_ALLOC) init_srcu_struct_nodes(ssp, GFP_KERNEL); else - smp_store_release(&ssp->srcu_sup->srcu_size_state, ss_state + 1); + smp_store_release(&sup->srcu_size_state, ss_state + 1); } } |