The patch titled
Subject: dma-mapping.h: preserve unmap info for CONFIG_DMA_API_DEBUG
has been added to the -mm tree. Its filename is
dma-mappingh-preserve-unmap-info-for-config_dma_api_debug.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/dma-mappingh-preserve-unmap-info-for-config_dma_api_debug.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/dma-mappingh-preserve-unmap-info-for-config_dma_api_debug.patch
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------------------------------------------------------
From: Andrey Smirnov <andrew.smirnov@xxxxxxxxx>
Subject: dma-mapping.h: preserve unmap info for CONFIG_DMA_API_DEBUG
When CONFIG_DMA_API_DEBUG is enabled we need to preserve unmapping address
even if "unmap" is a no-op for our architecutre because we need
debug_dma_unmap_page() to correctly cleanup all of the debug bookkeeping.
Failing to do so results in a false positive warnings about previously
mapped areas never being unmapped.
Link: http://lkml.kernel.org/r/1474387125-3713-1-git-send-email-andrew.smirnov@xxxxxxxxx
Signed-off-by: Andrey Smirnov <andrew.smirnov@xxxxxxxxx>
Cc: Robin Murphy <Robin.Murphy@xxxxxxx>
Cc: Joerg Roedel <jroedel@xxxxxxx>
Cc: Will Deacon <will.deacon@xxxxxxx>
Cc: Zhen Lei <thunder.leizhen@xxxxxxxxxx>
Cc: "Luis R. Rodriguez" <mcgrof@xxxxxxxx>
Cc: Christian Borntraeger <borntraeger@xxxxxxxxxx>
Cc: Geliang Tang <geliangtang@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/dma-mapping.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN include/linux/dma-mapping.h~dma-mappingh-preserve-unmap-info-for-config_dma_api_debug include/linux/dma-mapping.h
--- a/include/linux/dma-mapping.h~dma-mappingh-preserve-unmap-info-for-config_dma_api_debug
+++ a/include/linux/dma-mapping.h
@@ -718,7 +718,7 @@ static inline int dma_mmap_wc(struct dev
#define dma_mmap_writecombine dma_mmap_wc
#endif
-#ifdef CONFIG_NEED_DMA_MAP_STATE
+#if defined(CONFIG_NEED_DMA_MAP_STATE) || defined(CONFIG_DMA_API_DEBUG)
#define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME) dma_addr_t ADDR_NAME
#define DEFINE_DMA_UNMAP_LEN(LEN_NAME) __u32 LEN_NAME
#define dma_unmap_addr(PTR, ADDR_NAME) ((PTR)->ADDR_NAME)
_
Patches currently in -mm which might be from andrew.smirnov@xxxxxxxxx are
dma-mappingh-preserve-unmap-info-for-config_dma_api_debug.patch
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