linux-kernel - RE: [PATCH 11/17] iommu/vt-d: Fix operand size in bitwise operation

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Message-ID: <ec1536af68e6478a9b10a0d884cc988d@AcuMS.aculab.com>
Date:   Tue, 11 Apr 2023 21:22:52 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Lu Baolu' <baolu.lu@...ux.intel.com>,
        Joerg Roedel <joro@...tes.org>
CC:     Vinod Koul <vkoul@...nel.org>, Tina Zhang <tina.zhang@...el.com>,
        "Jacob Pan" <jacob.jun.pan@...ux.intel.com>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 11/17] iommu/vt-d: Fix operand size in bitwise operation

From: Lu Baolu
> Sent: 11 April 2023 07:48
> 
> From: Tina Zhang <tina.zhang@...el.com>
> 
> The patch fixes the klocwork issues that operands in a bitwise operation
> have different size at line 1692 of dmar.c, line 1898 and line 1907 of
> iommu.c.

Why is this any kind of thing that needs fixing?

	David

> Reported-by: Yongwei Ma <yongwei.ma@...el.com>
> Signed-off-by: Tina Zhang <tina.zhang@...el.com>
> Link: https://lore.kernel.org/r/20230406065944.2773296-2-tina.zhang@intel.com
> Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
> ---
>  drivers/iommu/intel/dmar.c  | 2 +-
>  drivers/iommu/intel/iommu.c | 4 ++--
>  2 files changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/iommu/intel/dmar.c b/drivers/iommu/intel/dmar.c
> index 23828d189c2a..f0f51c957ccb 100644
> --- a/drivers/iommu/intel/dmar.c
> +++ b/drivers/iommu/intel/dmar.c
> @@ -1690,7 +1690,7 @@ static void __dmar_enable_qi(struct intel_iommu *iommu)
>  	 * is present.
>  	 */
>  	if (ecap_smts(iommu->ecap))
> -		val |= (1 << 11) | 1;
> +		val |= BIT_ULL(11) | BIT_ULL(0);
> 
>  	raw_spin_lock_irqsave(&iommu->register_lock, flags);
> 
> diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
> index f4e536fd5a28..acbf82fa90e7 100644
> --- a/drivers/iommu/intel/iommu.c
> +++ b/drivers/iommu/intel/iommu.c
> @@ -1870,7 +1870,7 @@ context_set_sm_rid2pasid(struct context_entry *context, unsigned long pasid)
>   */
>  static inline void context_set_sm_dte(struct context_entry *context)
>  {
> -	context->lo |= (1 << 2);
> +	context->lo |= BIT_ULL(2);
>  }
> 
>  /*
> @@ -1879,7 +1879,7 @@ static inline void context_set_sm_dte(struct context_entry *context)
>   */
>  static inline void context_set_sm_pre(struct context_entry *context)
>  {
> -	context->lo |= (1 << 4);
> +	context->lo |= BIT_ULL(4);
>  }
> 
>  /* Convert value to context PASID directory size field coding. */
> --
> 2.34.1

-
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