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Subject[PATCH v2 4/4] asm-generic/io.h: Drop ioremap_uc() stub for systems with MMU
From
Date
8c7ea50c010b ("x86/mm, asm-generic: Add IOMMU ioremap_uc() variant
default") added a default ioremap_uc() implementation that always returns
NULL to indicate failure.

For arches that don't implement their own ioremap_uc(), the default
implementation allows us to *build* drivers that use ioremap_uc(), but they
won't work.

Remove the default ioremap_uc() so a driver that depends on it will fail at
build-time rather than at run-time.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
---
include/asm-generic/io.h | 22 ++++------------------
1 file changed, 4 insertions(+), 18 deletions(-)

diff --git a/include/asm-generic/io.h b/include/asm-generic/io.h
index 3f8a7e589071..7b0617d2d210 100644
--- a/include/asm-generic/io.h
+++ b/include/asm-generic/io.h
@@ -798,29 +798,15 @@ static inline void *phys_to_virt(unsigned long address)
}
#endif

+#ifndef CONFIG_MMU
+
/**
* DOC: ioremap() and ioremap_*() variants
*
* If you have an MMU, your architecture must implement both ioremap() and
- * iounmap().
+ * iounmap(), as well as variants like ioremap_nocache(), ioremap_uc(),
+ * and ioremap_wc().
*
- * It must also implement variants such as ioremap_uc(). The default
- * implementation here returns failure (NULL) to avoid improper behavior.
- */
-
-#ifdef CONFIG_MMU
-
-#ifndef ioremap_uc
-#define ioremap_uc ioremap_uc
-static inline void __iomem *ioremap_uc(phys_addr_t offset, size_t size)
-{
- return NULL;
-}
-#endif
-
-#else /* !CONFIG_MMU */
-
-/*
* If you don't have an MMU, the default implementations here provide
* direct identity mapping. You can override these if necessary.
*/
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