linux-kernel - [PATCH] dma-mapping: make map_benchmark compile into module

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Message-ID: <1616552258-22282-1-git-send-email-tiantao6@hisilicon.com>
Date:   Wed, 24 Mar 2021 10:17:38 +0800
From:   Tian Tao <tiantao6@...ilicon.com>
To:     <akpm@...ux-foundation.org>, <peterz@...radead.org>,
        <paulmck@...nel.org>, <ast@...nel.org>, <tglx@...utronix.de>,
        <rostedt@...dmis.org>, <hch@....de>, <m.szyprowski@...sung.com>,
        <song.bao.hua@...ilicon.com>
CC:     <iommu@...ts.linux-foundation.org>, <linux-kernel@...r.kernel.org>,
        "Tian Tao" <tiantao6@...ilicon.com>
Subject: [PATCH] dma-mapping: make map_benchmark compile into module

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@...ilicon.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