This is a note to let you know that I've just added the patch titled
dma-mapping: Fix build error unused-value
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
dma-mapping-fix-build-error-unused-value.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 50d6281ce9b8412f7ef02d1bc9d23aa62ae0cf98 Mon Sep 17 00:00:00 2001
From: Ren Zhijie <renzhijie2@xxxxxxxxxx>
Date: Thu, 30 Jun 2022 20:35:28 +0800
Subject: dma-mapping: Fix build error unused-value
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From: Ren Zhijie <renzhijie2@xxxxxxxxxx>
commit 50d6281ce9b8412f7ef02d1bc9d23aa62ae0cf98 upstream.
If CONFIG_DMA_DECLARE_COHERENT is not set,
make ARCH=x86_64 CROSS_COMPILE=x86_64-linux-gnu- will be failed, like this:
drivers/remoteproc/remoteproc_core.c: In function ‘rproc_rvdev_release’:
/include/linux/dma-map-ops.h:182:42: error: statement with no effect [-Werror=unused-value]
#define dma_release_coherent_memory(dev) (0)
^
drivers/remoteproc/remoteproc_core.c:464:2: note: in expansion of macro ‘dma_release_coherent_memory’
dma_release_coherent_memory(dev);
^~~~~~~~~~~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors
The return type of function dma_release_coherent_memory in CONFIG_DMA_DECLARE_COHERENT area is void, so in !CONFIG_DMA_DECLARE_COHERENT area it should neither return any value nor be defined as zero.
Reported-by: Hulk Robot <hulkci@xxxxxxxxxx>
Fixes: e61c451476e6 ("dma-mapping: Add dma_release_coherent_memory to DMA API")
Signed-off-by: Ren Zhijie <renzhijie2@xxxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Link: https://lore.kernel.org/r/20220630123528.251181-1-renzhijie2@xxxxxxxxxx
Signed-off-by: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
include/linux/dma-map-ops.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/include/linux/dma-map-ops.h
+++ b/include/linux/dma-map-ops.h
@@ -179,10 +179,10 @@ static inline int dma_declare_coherent_m
return -ENOSYS;
}
-#define dma_release_coherent_memory(dev) (0)
#define dma_alloc_from_dev_coherent(dev, size, handle, ret) (0)
#define dma_release_from_dev_coherent(dev, order, vaddr) (0)
#define dma_mmap_from_dev_coherent(dev, vma, vaddr, order, ret) (0)
+static inline void dma_release_coherent_memory(struct device *dev) { }
#endif /* CONFIG_DMA_DECLARE_COHERENT */
#ifdef CONFIG_DMA_GLOBAL_POOL
Patches currently in stable-queue which might be from renzhijie2@xxxxxxxxxx are
queue-5.15/dma-mapping-fix-build-error-unused-value.patch
