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authorLinus Torvalds <torvalds@linux-foundation.org>2020-08-15 01:22:43 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2020-08-15 01:22:43 +0300
commit5848dc5b1b76d83599dcec1b39f188a7cbdca7e2 (patch)
tree740d7bd1ae3c67665ff0d602e1ccfea013609264 /include
parenta85ffd59bd362d6c2e456e7f523b091830cd5454 (diff)
downloadlinux-5848dc5b1b76d83599dcec1b39f188a7cbdca7e2.tar.xz
dma-debug: remove debug_dma_assert_idle() function
This remoes the code from the COW path to call debug_dma_assert_idle(), which was added many years ago. Google shows that it hasn't caught anything in the 6+ years we've had it apart from a false positive, and Hugh just noticed how it had a very unfortunate spinlock serialization in the COW path. He fixed that issue the previous commit (a85ffd59bd36: "dma-debug: fix debug_dma_assert_idle(), use rcu_read_lock()"), but let's see if anybody even notices when we remove this function entirely. NOTE! We keep the dma tracking infrastructure that was added by the commit that introduced it. Partly to make it easier to resurrect this debug code if we ever deside to, and partly because that tracking by pfn and offset looks quite reasonable. The problem with this debug code was simply that it was expensive and didn't seem worth it, not that it was wrong per se. Acked-by: Dan Williams <dan.j.williams@intel.com> Acked-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/dma-debug.h6
1 files changed, 0 insertions, 6 deletions
diff --git a/include/linux/dma-debug.h b/include/linux/dma-debug.h
index 4208f94d93f7..7b3b04ba60f3 100644
--- a/include/linux/dma-debug.h
+++ b/include/linux/dma-debug.h
@@ -67,8 +67,6 @@ extern void debug_dma_sync_sg_for_device(struct device *dev,
extern void debug_dma_dump_mappings(struct device *dev);
-extern void debug_dma_assert_idle(struct page *page);
-
#else /* CONFIG_DMA_API_DEBUG */
static inline void dma_debug_add_bus(struct bus_type *bus)
@@ -157,10 +155,6 @@ static inline void debug_dma_dump_mappings(struct device *dev)
{
}
-static inline void debug_dma_assert_idle(struct page *page)
-{
-}
-
#endif /* CONFIG_DMA_API_DEBUG */
#endif /* __DMA_DEBUG_H */