On Sun, Jan 4, 2026 at 7:32 PM Zqiang <[email protected]> wrote: > > > > > On Sun, Jan 04, 2026 at 04:10:27PM +0800, Donglin Peng wrote: > > > > > > > > From: Donglin Peng <[email protected]> > > > > > > The RCU stall warning message includes an "idle=" field to indicate > > > the dyntick-idle state of a CPU. According to > > > Documentation/RCU/stallwarn.rst, > > > the hexadecimal number before the first '/' represents the low-order 16 > > > bits of the dynticks counter. An even value denotes that the CPU is in > > > dyntick-idle mode, while an odd value indicates otherwise. [...] > > > kernel/rcu/tree_stall.h | 2 +- > > > 1 file changed, 1 insertion(+), 1 deletion(-) > > > > > > diff --git a/kernel/rcu/tree_stall.h b/kernel/rcu/tree_stall.h > > > index b67532cb8770..d25cc826d77a 100644 > > > --- a/kernel/rcu/tree_stall.h > > > +++ b/kernel/rcu/tree_stall.h > > > @@ -555,7 +555,7 @@ static void print_cpu_stall_info(int cpu) > > > rdp->rcu_iw_pending ? (int)min(delta, 9UL) + '0' : > > > "!."[!delta], > > > ticks_value, ticks_title, > > > - ct_rcu_watching_cpu(cpu) & 0xffff, > > > + (ct_rcu_watching_cpu(cpu) >> ilog2(CT_RCU_WATCHING)) & 0xffff, > > > > May be also use CT_RCU_WATCHING_START to > replace ilog2(CT_RCU_WATCHING) operations? (I didn't actually test it)
It should compile down to the same thing, but either is fine with me. thanks, - Joel
