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Re: [PATCH v3 08/13] sched/wait: Add a waitqueue helper for fully exclusive priority waiters
- To: Sean Christopherson <seanjc@xxxxxxxxxx>, "K. Y. Srinivasan" <kys@xxxxxxxxxxxxx>, Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>, Wei Liu <wei.liu@xxxxxxxxxx>, Dexuan Cui <decui@xxxxxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Paolo Bonzini <pbonzini@xxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Juri Lelli <juri.lelli@xxxxxxxxxx>, Vincent Guittot <vincent.guittot@xxxxxxxxxx>, Shuah Khan <shuah@xxxxxxxxxx>, Marc Zyngier <maz@xxxxxxxxxx>, Oliver Upton <oliver.upton@xxxxxxxxx>
- From: K Prateek Nayak <kprateek.nayak@xxxxxxx>
- Date: Fri, 30 May 2025 14:15:08 +0530
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- Cc: linux-kernel@xxxxxxxxxxxxxxx, linux-hyperv@xxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx, kvm@xxxxxxxxxxxxxxx, linux-kselftest@xxxxxxxxxxxxxxx, linux-arm-kernel@xxxxxxxxxxxxxxxxxxx, kvmarm@xxxxxxxxxxxxxxx, David Matlack <dmatlack@xxxxxxxxxx>
- Delivery-date: Fri, 30 May 2025 08:45:40 +0000
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Hello Sean,
On 5/23/2025 5:22 AM, Sean Christopherson wrote:
Add a waitqueue helper to add a priority waiter that requires exclusive
wakeups, i.e. that requires that it be the _only_ priority waiter. The
API will be used by KVM to ensure that at most one of KVM's irqfds is
bound to a single eventfd (across the entire kernel).
Open code the helper instead of using __add_wait_queue() so that the
common path doesn't need to "handle" impossible failures.
Cc: K Prateek Nayak <kprateek.nayak@xxxxxxx>
Feel free to include:
Reviewed-by: K Prateek Nayak <kprateek.nayak@xxxxxxx>
--
Thanks and Regards,
Prateek
Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx>
---
include/linux/wait.h | 2 ++
kernel/sched/wait.c | 18 ++++++++++++++++++
2 files changed, 20 insertions(+)
[..snip..]
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