On Sun, 12 Jul 2020 at 21:39, Paul E. McKenney paulmck@kernel.org wrote:
On Sun, Jul 12, 2020 at 06:40:03PM +0530, madhuparnabhowmik10@gmail.com wrote:
From: Madhuparna Bhowmik madhuparnabhowmik10@gmail.com
Use hlist_for_each_entry_srcu() instead of hlist_for_each_entry_rcu() as it also checkes if the right lock is held. Using hlist_for_each_entry_rcu() with a condition argument will not report the cases where a SRCU protected list is traversed using rcu_read_lock(). Hence, use hlist_for_each_entry_srcu().
Signed-off-by: Madhuparna Bhowmik madhuparnabhowmik10@gmail.com
I queued both for testing and review, thank you!
In particular, this one needs an ack by the maintainer.
Thanx, Paularch/x86/kvm/mmu/page_track.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kvm/mmu/page_track.c b/arch/x86/kvm/mmu/page_track.c index a7bcde34d1f2..a9cd17625950 100644 --- a/arch/x86/kvm/mmu/page_track.c +++ b/arch/x86/kvm/mmu/page_track.c @@ -229,7 +229,8 @@ void kvm_page_track_write(struct kvm_vcpu *vcpu, gpa_t gpa, const u8 *new, return;
idx = srcu_read_lock(&head->track_srcu);
hlist_for_each_entry_rcu(n, &head->track_notifier_list, node)
hlist_for_each_entry_srcu(n, &head->track_notifier_list, node,srcu_read_lock_held(&head->track_srcu))
x86 build failed on linux -next 20200716.
arch/x86/kvm/mmu/page_track.c: In function 'kvm_page_track_write': include/linux/rculist.h:727:30: error: left-hand operand of comma expression has no effect [-Werror=unused-value] for (__list_check_srcu(cond), \ ^ arch/x86/kvm/mmu/page_track.c:232:2: note: in expansion of macro 'hlist_for_each_entry_srcu' hlist_for_each_entry_srcu(n, &head->track_notifier_list, node, ^~~~~~~~~~~~~~~~~~~~~~~~~ arch/x86/kvm/mmu/page_track.c: In function 'kvm_page_track_flush_slot': include/linux/rculist.h:727:30: error: left-hand operand of comma expression has no effect [-Werror=unused-value] for (__list_check_srcu(cond), \ ^ arch/x86/kvm/mmu/page_track.c:258:2: note: in expansion of macro 'hlist_for_each_entry_srcu' hlist_for_each_entry_srcu(n, &head->track_notifier_list, node, ^~~~~~~~~~~~~~~~~~~~~~~~~ cc1: all warnings being treated as errors make[3]: *** [arch/x86/kvm/mmu/page_track.o] Error 1
build link, https://ci.linaro.org/view/lkft/job/openembedded-lkft-linux-next/DISTRO=lkft...