linux-kernel - Re: [PATCH] iommu/amd: Use atomic64_inc

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Message-ID: <20241008181232.GD762027@ziepe.ca>
Date: Tue, 8 Oct 2024 15:12:32 -0300
From: Jason Gunthorpe <jgg@...pe.ca>
To: Uros Bizjak <ubizjak@...il.com>
Cc: iommu@...ts.linux.dev, linux-kernel@...r.kernel.org,
	Joerg Roedel <joro@...tes.org>,
	Suravee Suthikulpanit <suravee.suthikulpanit@....com>,
	Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>
Subject: Re: [PATCH] iommu/amd: Use atomic64_inc_return() in iommu.c

On Mon, Oct 07, 2024 at 10:43:31AM +0200, Uros Bizjak wrote:
> Use atomic64_inc_return(&ref) instead of atomic64_add_return(1, &ref)
> to use optimized implementation and ease register pressure around
> the primitive for targets that implement optimized variant.
> 
> Signed-off-by: Uros Bizjak <ubizjak@...il.com>
> Cc: Joerg Roedel <joro@...tes.org>
> Cc: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
> Cc: Will Deacon <will@...nel.org>
> Cc: Robin Murphy <robin.murphy@....com>
> ---
>  drivers/iommu/amd/iommu.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)

Reviewed-by: Jason Gunthorpe <jgg@...dia.com>

Jason