linux-kernel - [PATCH v2] ia64: simplify code flow around swiotlb init

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Message-Id: <20210328202439.403601-1-slyfox@gentoo.org>
Date:   Sun, 28 Mar 2021 21:24:39 +0100
From:   Sergei Trofimovich <slyfox@...too.org>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
        inux-ia64@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Sergei Trofimovich <slyfox@...too.org>,
        linux-ia64@...r.kernel.org
Subject: [PATCH v2] ia64: simplify code flow around swiotlb init

Before the change CONFIG_INTEL_IOMMU && !CONFIG_SWIOTLB && !CONFIG_FLATMEM
could skip `set_max_mapnr(max_low_pfn);` if iommu is not present on system.

CC: Andrew Morton <akpm@...ux-foundation.org>
CC: John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
CC: linux-ia64@...r.kernel.org
Signed-off-by: Sergei Trofimovich <slyfox@...too.org>
---
Change since v1: fixed a typo in commit mesage.

 arch/ia64/mm/init.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/arch/ia64/mm/init.c b/arch/ia64/mm/init.c
index 16d0d7d22657..a63585db94fe 100644
--- a/arch/ia64/mm/init.c
+++ b/arch/ia64/mm/init.c
@@ -644,13 +644,16 @@ mem_init (void)
 	 * _before_ any drivers that may need the PCI DMA interface are
 	 * initialized or bootmem has been freed.
 	 */
+	do {
 #ifdef CONFIG_INTEL_IOMMU
-	detect_intel_iommu();
-	if (!iommu_detected)
+		detect_intel_iommu();
+		if (iommu_detected)
+			break;
 #endif
 #ifdef CONFIG_SWIOTLB
 		swiotlb_init(1);
 #endif
+	} while (0);
 
 #ifdef CONFIG_FLATMEM
 	BUG_ON(!mem_map);
-- 
2.31.1