linux-kernel - Re: [PATCH] iommu/intel: remove an unused variable "length"

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Message-ID: <5405235e-50a2-cfbb-3f3d-af7cbefce183@linux.intel.com>
Date:   Tue, 18 Jun 2019 10:25:09 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Qian Cai <cai@....pw>, jroedel@...e.de
Cc:     baolu.lu@...ux.intel.com, dwmw2@...radead.org,
        eric.auger@...hat.com, iommu@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iommu/intel: remove an unused variable "length"

Hi,

On 6/17/19 9:20 PM, Qian Cai wrote:
> The linux-next commit "iommu/vt-d: Duplicate iommu_resv_region objects
> per device list" [1] left out an unused variable,
> 
> drivers/iommu/intel-iommu.c: In function 'dmar_parse_one_rmrr':
> drivers/iommu/intel-iommu.c:4014:9: warning: variable 'length' set but
> not used [-Wunused-but-set-variable]
> 
> [1] https://lore.kernel.org/patchwork/patch/1083073/
> 
> Signed-off-by: Qian Cai <cai@....pw>

With regard to the subject, we normally use "iommu/vt-d: ".

Best regards,
Baolu

> ---
>   drivers/iommu/intel-iommu.c | 3 ---
>   1 file changed, 3 deletions(-)
> 
> diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
> index 478ac186570b..d86d4ee5cc78 100644
> --- a/drivers/iommu/intel-iommu.c
> +++ b/drivers/iommu/intel-iommu.c
> @@ -4011,7 +4011,6 @@ int __init dmar_parse_one_rmrr(struct acpi_dmar_header *header, void *arg)
>   {
>   	struct acpi_dmar_reserved_memory *rmrr;
>   	struct dmar_rmrr_unit *rmrru;
> -	size_t length;
>   
>   	rmrru = kzalloc(sizeof(*rmrru), GFP_KERNEL);
>   	if (!rmrru)
> @@ -4022,8 +4021,6 @@ int __init dmar_parse_one_rmrr(struct acpi_dmar_header *header, void *arg)
>   	rmrru->base_address = rmrr->base_address;
>   	rmrru->end_address = rmrr->end_address;
>   
> -	length = rmrr->end_address - rmrr->base_address + 1;
> -
>   	rmrru->devices = dmar_alloc_dev_scope((void *)(rmrr + 1),
>   				((void *)rmrr) + rmrr->header.length,
>   				&rmrru->devices_cnt);
>