netdev - Re: [PATCH v4 bpf-next 01/15] bpf: split read liveness into REG_LIVE_READ64 and REG_LIVE

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Date:   Mon, 15 Apr 2019 16:03:59 -0700
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     Jiong Wang <jiong.wang@...ronome.com>
Cc:     alexei.starovoitov@...il.com, daniel@...earbox.net,
        bpf@...r.kernel.org, netdev@...r.kernel.org,
        oss-drivers@...ronome.com
Subject: Re: [PATCH v4 bpf-next 01/15] bpf: split read liveness into
 REG_LIVE_READ64 and REG_LIVE_READ32

On Mon, 15 Apr 2019 18:26:11 +0100, Jiong Wang wrote:
> Register liveness infrastructure doesn't track register read width at the
> moment, while the width information will be needed for the later 32-bit
> safety analysis pass.
> 
> This patch take the first step to split read liveness into REG_LIVE_READ64
> and REG_LIVE_READ32.
> 
> Liveness propagation code are updated accordingly. They are taught to
> understand how to propagate REG_LIVE_READ64 and REG_LIVE_READ32 at the same
> propagation iteration. For example, "mark_reg_read" now propagate "flags"
> which could be multiple read bits instead of the single REG_LIVE_READ64.
> 
> A write still screen off all width of reads.
> 
> Signed-off-by: Jiong Wang <jiong.wang@...ronome.com>

Reviewed-by: Jakub Kicinski <jakub.kicinski@...ronome.com>

Thanks!