On Thu, Sep 12 2024 at 15:44, Christoph Lameter via wrote: $Subject: ..... You still fail to provide a proper subsystem prefix. It's not rocket science. https://www.kernel.org/doc/html/latest/process/maintainer-tip.html#patch-subject > From: "Christoph Lameter (Ampere)" <cl@xxxxxxxxxx> > > Some architectures support load acquire which can save us a memory > barrier and save some cycles. > > A typical sequence > > do { > seq = read_seqcount_begin(&s); > <something> > } while (read_seqcount_retry(&s, seq); > > requires 13 cycles on ARM64 for an empty loop. Two read memory > barriers are needed. One for each of the seqcount_* functions. > > We can replace the first read barrier with a load acquire of > the seqcount which saves us one barrier. We .... Please write changelogs using passive voice. 'We' means nothing here. Thanks, tglx
