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From:   Tian Tao <tiantao6@hisilicon.com>
To:     <akpm@linux-foundation.org>, <peterz@infradead.org>,
        <paulmck@kernel.org>, <ast@kernel.org>, <tglx@linutronix.de>,
        <rostedt@goodmis.org>, <hch@lst.de>, <m.szyprowski@samsung.com>,
        <song.bao.hua@hisilicon.com>
CC:     <iommu@lists.linux-foundation.org>, <linux-kernel@vger.kernel.org>,
        "Tian Tao" <tiantao6@hisilicon.com>
Subject: [PATCH] dma-mapping: make map_benchmark compile into module
Date:   Wed, 24 Mar 2021 10:17:38 +0800
Message-ID: <1616552258-22282-1-git-send-email-tiantao6@hisilicon.com>
MIME-Version: 1.0
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under some scenarios, it is necessary to compile map_benchmark
into module to test iommu, so this patch changed Kconfig and
export_symbol to implement map_benchmark compiled into module.

On the other hand, map_benchmark is a driver, which is supposed
to be able to run as a module.

Signed-off-by: Tian Tao <tiantao6@hisilicon.com>
---
 kernel/dma/Kconfig | 2 +-
 kernel/kthread.c   | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/dma/Kconfig b/kernel/dma/Kconfig
index 77b4055..0468293 100644
--- a/kernel/dma/Kconfig
+++ b/kernel/dma/Kconfig
@@ -223,7 +223,7 @@ config DMA_API_DEBUG_SG
 	  If unsure, say N.
 
 config DMA_MAP_BENCHMARK
-	bool "Enable benchmarking of streaming DMA mapping"
+	tristate "Enable benchmarking of streaming DMA mapping"
 	depends on DEBUG_FS
 	help
 	  Provides /sys/kernel/debug/dma_map_benchmark that helps with testing
diff --git a/kernel/kthread.c b/kernel/kthread.c
index 1578973..fa4736f 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -455,6 +455,7 @@ void kthread_bind_mask(struct task_struct *p, const struct cpumask *mask)
 {
 	__kthread_bind_mask(p, mask, TASK_UNINTERRUPTIBLE);
 }
+EXPORT_SYMBOL(kthread_bind_mask);
 
 /**
  * kthread_bind - bind a just-created kthread to a cpu.
-- 
2.7.4