linux-kernel - Re: [PATCH 5.6 61/73] iommu/vt-d: Use right Kconfig option name

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Date:   Mon, 04 May 2020 12:42:48 -0700
From:   Joe Perches <joe@...ches.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org
Cc:     stable@...r.kernel.org, Lu Baolu <baolu.lu@...ux.intel.com>,
        Ashok Raj <ashok.raj@...el.com>,
        Joerg Roedel <jroedel@...e.de>,
        Sanjay K <sanjay.k.kumar@...el.com>,
        David Woodhouse <dwmw2@...radead.org>,
        iommu <iommu@...ts.linux-foundation.org>
Subject: Re: [PATCH 5.6 61/73] iommu/vt-d: Use right Kconfig option name

On Mon, 2020-05-04 at 19:58 +0200, Greg Kroah-Hartman wrote:
> From: Lu Baolu <baolu.lu@...ux.intel.com>
> 
> commit ba61c3da00f4a5bf8805aeca1ba5ac3c9bd82e96 upstream.
> 
> The CONFIG_ prefix should be added in the code.
> 
> Fixes: 046182525db61 ("iommu/vt-d: Add Kconfig option to enable/disable scalable mode")
> Reported-and-tested-by: Kumar, Sanjay K <sanjay.k.kumar@...el.com>
> Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
> Cc: Ashok Raj <ashok.raj@...el.com>
> Link: https://lore.kernel.org/r/20200501072427.14265-1-baolu.lu@linux.intel.com
> Signed-off-by: Joerg Roedel <jroedel@...e.de>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> 
> ---
>  drivers/iommu/intel-iommu.c |    4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> --- a/drivers/iommu/intel-iommu.c
> +++ b/drivers/iommu/intel-iommu.c
> @@ -371,11 +371,11 @@ int dmar_disabled = 0;
>  int dmar_disabled = 1;
>  #endif /* CONFIG_INTEL_IOMMU_DEFAULT_ON */
>  
> -#ifdef INTEL_IOMMU_SCALABLE_MODE_DEFAULT_ON
> +#ifdef CONFIG_INTEL_IOMMU_SCALABLE_MODE_DEFAULT_ON
>  int intel_iommu_sm = 1;
>  #else
>  int intel_iommu_sm;
> -#endif /* INTEL_IOMMU_SCALABLE_MODE_DEFAULT_ON */
> +#endif /* CONFIG_INTEL_IOMMU_SCALABLE_MODE_DEFAULT_ON */

Perhaps simpler as

int intel_iommu_sm = IS_BUILTIN(CONFIG_INTEL_IOMMU_SCALABLE_MODE_DEFAULT_ON);

So perhaps:
---
 drivers/iommu/intel-iommu.c | 13 ++-----------
 1 file changed, 2 insertions(+), 11 deletions(-)

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 0182cff2c7ac..ab8552c48391 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -365,17 +365,8 @@ static int intel_iommu_attach_device(struct iommu_domain *domain,
 static phys_addr_t intel_iommu_iova_to_phys(struct iommu_domain *domain,
 					    dma_addr_t iova);
 
-#ifdef CONFIG_INTEL_IOMMU_DEFAULT_ON
-int dmar_disabled = 0;
-#else
-int dmar_disabled = 1;
-#endif /* CONFIG_INTEL_IOMMU_DEFAULT_ON */
-
-#ifdef CONFIG_INTEL_IOMMU_SCALABLE_MODE_DEFAULT_ON
-int intel_iommu_sm = 1;
-#else
-int intel_iommu_sm;
-#endif /* CONFIG_INTEL_IOMMU_SCALABLE_MODE_DEFAULT_ON */
+int dmar_disabled = !IS_BUILTIN(CONFIG_INTEL_IOMMU_DEFAULT_ON);
+int intel_iommu_sm = IS_BUILTIN(CONFIG_INTEL_IOMMU_SCALABLE_MODE_DEFAULT_ON);
 
 int intel_iommu_enabled = 0;
 EXPORT_SYMBOL_GPL(intel_iommu_enabled);