linux-kernel - Re: [PATCH] i40e: Remove useless DMA-32 fallback configuration

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Date:   Sun, 9 Jan 2022 18:30:55 +0100
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Jesse Brandeburg <jesse.brandeburg@...el.com>,
        Tony Nguyen <anthony.l.nguyen@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christoph Hellwig <hch@....de>,
        Alexander Lobakin <alexandr.lobakin@...el.com>,
        intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org
Subject: Re: [PATCH] i40e: Remove useless DMA-32 fallback configuration

Le 09/01/2022 à 18:14, Christophe JAILLET a écrit :
> As stated in [1], dma_set_mask() with a 64-bit mask never fails if
> dev->dma_mask is non-NULL.
> So, if it fails, the 32 bits case will also fail for the same reason.
> 
> So, if dma_set_mask_and_coherent() succeeds, 'pci_using_dac' is known to be
> 1.
> 
> Simplify code and remove some dead code accordingly.
> 
> [1]: https://lkml.org/lkml/2021/6/7/398
> 
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> Reviewed-by: Christoph Hellwig <hch@....de>
> Reviewed-by: Alexander Lobakin <alexandr.lobakin@...el.com>
> ---
>   drivers/net/ethernet/intel/e1000e/netdev.c | 22 +++++++---------------
>   1 file changed, 7 insertions(+), 15 deletions(-)

NAK, wrong subject

CJ