Thomas Gleixner <tglx@xxxxxxxxxxxxx> writes: > On Fri, 30 Nov 2018, Vitaly Kuznetsov wrote: > >> Subject: x86/hyper-v: define structures from TLFS as packed > > Please start the first word after the prefix colon with an uppercase > letter. Also structures from TLFS doesn't make sense to me. Something like > this: > > Subject: x86/hyper-v: Mark TLFS structures packed > >> Without 'packed' compiler is free to add optimization paddings and re-order >> structure fields for randomization/optimization. And structures from > > s/And/As/ ? > >> hyperv-tlfs.h are used for hypervisor-guest communication, we need to >> ultimately forbid such practices. > > That whole paragraph reads a bit strange. Something like: > > The TLFS structures are used for hypervisor-guest communication and must > exactly meet the specification. > > Compilers can add alignment padding to structures or reorder struct > members for randomization and optimization, which would break the > hypervisor ABI. > > Mark the structures as packed to prevent this. > > Hmm? Sure, will do v2! > >> Suggested-by: Nadav Amit <nadav.amit@xxxxxxxxx> >> Signed-off-by: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx> > > Other than that: Acked-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Thanks! -- Vitaly
