linux-kernel - [PATCH 5.4 181/255] iommu/iova: Fix module config properly

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Message-Id: <20221024113008.882222839@linuxfoundation.org>
Date:   Mon, 24 Oct 2022 13:31:31 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Thierry Reding <thierry.reding@...il.com>,
        John Garry <john.garry@...wei.com>,
        Robin Murphy <robin.murphy@....com>,
        Thierry Reding <treding@...dia.com>,
        Joerg Roedel <jroedel@...e.de>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 181/255] iommu/iova: Fix module config properly

From: Robin Murphy <robin.murphy@....com>

[ Upstream commit 4f58330fcc8482aa90674e1f40f601e82f18ed4a ]

IOMMU_IOVA is intended to be an optional library for users to select as
and when they desire. Since it can be a module now, this means that
built-in code which has chosen not to select it should not fail to link
if it happens to have selected as a module by someone else. Replace
IS_ENABLED() with IS_REACHABLE() to do the right thing.

CC: Thierry Reding <thierry.reding@...il.com>
Reported-by: John Garry <john.garry@...wei.com>
Fixes: 15bbdec3931e ("iommu: Make the iova library a module")
Signed-off-by: Robin Murphy <robin.murphy@....com>
Reviewed-by: Thierry Reding <treding@...dia.com>
Link: https://lore.kernel.org/r/548c2f683ca379aface59639a8f0cccc3a1ac050.1663069227.git.robin.murphy@arm.com
Signed-off-by: Joerg Roedel <jroedel@...e.de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 include/linux/iova.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/iova.h b/include/linux/iova.h
index a0637abffee8..6c19b09e9663 100644
--- a/include/linux/iova.h
+++ b/include/linux/iova.h
@@ -132,7 +132,7 @@ static inline unsigned long iova_pfn(struct iova_domain *iovad, dma_addr_t iova)
 	return iova >> iova_shift(iovad);
 }
 
-#if IS_ENABLED(CONFIG_IOMMU_IOVA)
+#if IS_REACHABLE(CONFIG_IOMMU_IOVA)
 int iova_cache_get(void);
 void iova_cache_put(void);
 
-- 
2.35.1