[PATCH v3 1/4] ARM: reintroduce ioremap_cached() for creating cached I/O mappings
From: Ard Biesheuvel <hidden>
Date: 2016-03-04 09:48:45
Subsystem:
arm port, the rest · Maintainers:
Russell King, Linus Torvalds
The original ARM-only ioremap flavor 'ioremap_cached' has been renamed to 'ioremap_cache' to align with other architectures, and subsequently abused in generic code to map things like firmware tables in memory. For that reason, there is currently an effort underway to deprecate ioremap_cache, whose semantics are poorly defined, and which is typed with an __iomem annotation that is inappropriate for mappings of ordinary memory. However, original users of ioremap_cached() used it in a context where the I/O connotation is appropriate, and replacing those instances with memremap() does not make sense. So let's revive ioremap_cached(), so that we can change back those original users before we drop ioremap_cache entirely in favor of memremap. Cc: Russell King <redacted> Signed-off-by: Ard Biesheuvel <redacted> --- arch/arm/include/asm/io.h | 6 ++++++ arch/arm/mm/ioremap.c | 4 ++++ 2 files changed, 10 insertions(+)
diff --git a/arch/arm/include/asm/io.h b/arch/arm/include/asm/io.h
index 485982084fe9..fb94de290edd 100644
--- a/arch/arm/include/asm/io.h
+++ b/arch/arm/include/asm/io.h@@ -395,6 +395,12 @@ void __iomem *ioremap(resource_size_t res_cookie, size_t size); void __iomem *ioremap_cache(resource_size_t res_cookie, size_t size); #define ioremap_cache ioremap_cache +/* + * Do not use ioremap_cached in new code. Provided for the benefit of + * the pxa2xx-flash MTD driver only. + */ +void __iomem *ioremap_cached(resource_size_t res_cookie, size_t size); + void __iomem *ioremap_wc(resource_size_t res_cookie, size_t size); #define ioremap_wc ioremap_wc #define ioremap_wt ioremap_wc
diff --git a/arch/arm/mm/ioremap.c b/arch/arm/mm/ioremap.c
index 66a978d05958..d5350f6af089 100644
--- a/arch/arm/mm/ioremap.c
+++ b/arch/arm/mm/ioremap.c@@ -380,11 +380,15 @@ void __iomem *ioremap(resource_size_t res_cookie, size_t size) EXPORT_SYMBOL(ioremap); void __iomem *ioremap_cache(resource_size_t res_cookie, size_t size) + __alias(ioremap_cached); + +void __iomem *ioremap_cached(resource_size_t res_cookie, size_t size) { return arch_ioremap_caller(res_cookie, size, MT_DEVICE_CACHED, __builtin_return_address(0)); } EXPORT_SYMBOL(ioremap_cache); +EXPORT_SYMBOL(ioremap_cached); void __iomem *ioremap_wc(resource_size_t res_cookie, size_t size) {
--
2.5.0