[patch 006/178] ia64: simplify code flow around swiotlb init

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



From: Sergei Trofimovich <slyfox@xxxxxxxxxx>
Subject: 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.

Link: https://lkml.kernel.org/r/20210328202439.403601-1-slyfox@xxxxxxxxxx
Signed-off-by: Sergei Trofimovich <slyfox@xxxxxxxxxx>
Cc: John Paul Adrian Glaubitz <glaubitz@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

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

--- a/arch/ia64/mm/init.c~ia64-simplify-code-flow-around-swiotlb-init
+++ a/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);
_




[Index of Archives]     [Linux ARM Kernel]     [Linux ARM]     [Linux Omap]     [Fedora ARM]     [IETF Annouce]     [Bugtraq]     [Linux OMAP]     [Linux MIPS]     [eCos]     [Asterisk Internet PBX]     [Linux API]

  Powered by Linux