From mboxrd@z Thu Jan 1 00:00:00 1970 From: robherring2@gmail.com (Rob Herring) Date: Tue, 6 Mar 2012 15:45:11 -0600 Subject: [PATCH v5 1/7] ARM: provide runtime hook for ioremap/iounmap In-Reply-To: References: Message-ID: <1331070317-9598-1-git-send-email-robherring2@gmail.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org From: Rob Herring We have compile time over-ride of ioremap and iounmap, but an run-time override is needed for multi-platform builds. This adds an extra function pointer check, but ioremap is not peformance critical. The option for compile time selection remains. The caller variant is used here to provide correct caller information as ARM can only support level 0 for __builtin_return_address. Signed-off-by: Rob Herring Cc: Russell King --- arch/arm/include/asm/io.h | 7 ++++++- arch/arm/mm/ioremap.c | 17 ++++++++++++++--- 2 files changed, 20 insertions(+), 4 deletions(-) diff --git a/arch/arm/include/asm/io.h b/arch/arm/include/asm/io.h index 9275828..6c363c1 100644 --- a/arch/arm/include/asm/io.h +++ b/arch/arm/include/asm/io.h @@ -83,6 +83,11 @@ extern void __iomem *__arm_ioremap_pfn(unsigned long, unsigned long, size_t, uns extern void __iomem *__arm_ioremap(unsigned long, size_t, unsigned int); extern void __iomem *__arm_ioremap_exec(unsigned long, size_t, bool cached); extern void __iounmap(volatile void __iomem *addr); +extern void __arm_iounmap(volatile void __iomem *addr); + +extern void __iomem * (*arch_ioremap_caller)(unsigned long, size_t, + unsigned int, void *); +extern void (*arch_iounmap)(volatile void __iomem *); /* * Bad read/write accesses... @@ -266,7 +271,7 @@ extern void _memset_io(volatile void __iomem *, int, size_t); */ #ifndef __arch_ioremap #define __arch_ioremap __arm_ioremap -#define __arch_iounmap __iounmap +#define __arch_iounmap __arm_iounmap #endif #define ioremap(cookie,size) __arch_ioremap((cookie), (size), MT_DEVICE) diff --git a/arch/arm/mm/ioremap.c b/arch/arm/mm/ioremap.c index 80632e8..0246290 100644 --- a/arch/arm/mm/ioremap.c +++ b/arch/arm/mm/ioremap.c @@ -306,11 +306,15 @@ __arm_ioremap_pfn(unsigned long pfn, unsigned long offset, size_t size, } EXPORT_SYMBOL(__arm_ioremap_pfn); +void __iomem * (*arch_ioremap_caller)(unsigned long, size_t, + unsigned int, void *) = + __arm_ioremap_caller; + void __iomem * __arm_ioremap(unsigned long phys_addr, size_t size, unsigned int mtype) { - return __arm_ioremap_caller(phys_addr, size, mtype, - __builtin_return_address(0)); + return arch_ioremap_caller(phys_addr, size, mtype, + __builtin_return_address(0)); } EXPORT_SYMBOL(__arm_ioremap); @@ -369,4 +373,11 @@ void __iounmap(volatile void __iomem *io_addr) vunmap(addr); } -EXPORT_SYMBOL(__iounmap); + +void (*arch_iounmap)(volatile void __iomem *) = __iounmap; + +void __arm_iounmap(volatile void __iomem *io_addr) +{ + arch_iounmap(io_addr); +} +EXPORT_SYMBOL(__arm_iounmap); -- 1.7.5.4