linux-kernel - [RFC PATCH 1/5] base: dma-mapping: Export commonly used symbols

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Date:   Wed,  5 Jul 2017 16:12:11 +0900
From:   Tomasz Figa <tfiga@...omium.org>
To:     iommu@...ts.linux-foundation.org
Cc:     linux-kernel@...r.kernel.org, Christoph Hellwig <hch@....de>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Joerg Roedel <joro@...tes.org>,
        Will Deacon <will.deacon@....com>,
        Vineet Gupta <vgupta@...opsys.com>,
        Hans-Christian Noren Egtvedt <egtvedt@...fundet.no>,
        Mitchel Humpherys <mitchelh@...eaurora.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Arnd Bergmann <arnd@...db.de>, Tomasz Figa <tfiga@...omium.org>
Subject: [RFC PATCH 1/5] base: dma-mapping: Export commonly used symbols

There is nothing wrong in having a loadable module implementing DMA API,
for example to be used for sub-devices registered by the module.
However, most of the functions from dma-mapping do not have their
symbols exported, making it impossible to use them from loadable modules.

Export the remaining non-static functions in the file, so that loadable
modules can benefit from them. Use EXPORT_SYMBOL() for consistency with
other exports in the file.

Signed-off-by: Tomasz Figa <tfiga@...omium.org>
---
 drivers/base/dma-mapping.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/base/dma-mapping.c b/drivers/base/dma-mapping.c
index 5096755d185e..1fda8df3d849 100644
--- a/drivers/base/dma-mapping.c
+++ b/drivers/base/dma-mapping.c
@@ -287,6 +287,7 @@ void *dma_common_pages_remap(struct page **pages, size_t size,
 
 	return area->addr;
 }
+EXPORT_SYMBOL(dma_common_pages_remap);
 
 /*
  * remaps an allocated contiguous region into another vm_area.
@@ -316,6 +317,7 @@ void *dma_common_contiguous_remap(struct page *page, size_t size,
 		return NULL;
 	return area->addr;
 }
+EXPORT_SYMBOL(dma_common_contiguous_remap);
 
 /*
  * unmaps a range previously mapped by dma_common_*_remap
@@ -332,6 +334,7 @@ void dma_common_free_remap(void *cpu_addr, size_t size, unsigned long vm_flags)
 	unmap_kernel_range((unsigned long)cpu_addr, PAGE_ALIGN(size));
 	vunmap(cpu_addr);
 }
+EXPORT_SYMBOL(dma_common_free_remap);
 #endif
 
 /*
-- 
2.13.2.725.g09c95d1e9-goog