linux-kernel - [PATCH 1/1] iommu/vt-d: Fix compile error [-Werror=implicit-function-declaration]

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Message-Id: <20210130151907.3929148-1-baolu.lu@linux.intel.com>
Date:   Sat, 30 Jan 2021 23:19:07 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Joerg Roedel <joro@...tes.org>
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        kernel test robot <lkp@...el.com>
Subject: [PATCH 1/1] iommu/vt-d: Fix compile error [-Werror=implicit-function-declaration]

trace_qi_submit() could be used when interrupt remapping is supported,
but DMA remapping is not. In this case, the following compile error
occurs.

../drivers/iommu/intel/dmar.c: In function 'qi_submit_sync':
../drivers/iommu/intel/dmar.c:1311:3: error: implicit declaration of function 'trace_qi_submit';
  did you mean 'ftrace_nmi_exit'? [-Werror=implicit-function-declaration]
   trace_qi_submit(iommu, desc[i].qw0, desc[i].qw1,
   ^~~~~~~~~~~~~~~
   ftrace_nmi_exit

Fixes: f2dd871799ba5 ("iommu/vt-d: Add qi_submit trace event")
Reported-by: kernel test robot <lkp@...el.com>
Reported-by: Randy Dunlap <rdunlap@...radead.org>
Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
---
 drivers/iommu/intel/Makefile       | 2 +-
 drivers/iommu/intel/iommu.c        | 1 -
 include/trace/events/intel_iommu.h | 2 --
 3 files changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/iommu/intel/Makefile b/drivers/iommu/intel/Makefile
index fb8e1e8c8029..ae570810a35e 100644
--- a/drivers/iommu/intel/Makefile
+++ b/drivers/iommu/intel/Makefile
@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0
 obj-$(CONFIG_DMAR_TABLE) += dmar.o
 obj-$(CONFIG_INTEL_IOMMU) += iommu.o pasid.o
-obj-$(CONFIG_INTEL_IOMMU) += trace.o
+obj-$(CONFIG_DMAR_TABLE) += trace.o
 obj-$(CONFIG_INTEL_IOMMU_DEBUGFS) += debugfs.o
 obj-$(CONFIG_INTEL_IOMMU_SVM) += svm.o
 obj-$(CONFIG_IRQ_REMAP) += irq_remapping.o
diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index d7fecc109947..37da4caa67c9 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -44,7 +44,6 @@
 #include <asm/irq_remapping.h>
 #include <asm/cacheflush.h>
 #include <asm/iommu.h>
-#include <trace/events/intel_iommu.h>
 
 #include "../irq_remapping.h"
 #include "pasid.h"
diff --git a/include/trace/events/intel_iommu.h b/include/trace/events/intel_iommu.h
index aad2ff0c1e2e..e801f4910522 100644
--- a/include/trace/events/intel_iommu.h
+++ b/include/trace/events/intel_iommu.h
@@ -6,7 +6,6 @@
  *
  * Author: Lu Baolu <baolu.lu@...ux.intel.com>
  */
-#ifdef CONFIG_INTEL_IOMMU
 #undef TRACE_SYSTEM
 #define TRACE_SYSTEM intel_iommu
 
@@ -176,4 +175,3 @@ TRACE_EVENT(qi_submit,
 
 /* This part must be outside protection */
 #include <trace/define_trace.h>
-#endif /* CONFIG_INTEL_IOMMU */
-- 
2.25.1