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Message-Id: <1412603561-27653-6-git-send-email-thierry.reding@gmail.com>
Date: Mon, 6 Oct 2014 15:52:37 +0200
From: Thierry Reding <thierry.reding@...il.com>
To: Arnd Bergmann <arnd@...db.de>, Olof Johansson <olof@...om.net>,
Fengguang Wu <fengguang.wu@...el.com>
Cc: Russell King <linux@....linux.org.uk>,
Catalin Marinas <catalin.marinas@....com>,
Stephen Boyd <sboyd@...eaurora.org>,
Sam Ravnborg <sam@...nborg.org>,
linux-arm-kernel@...ts.infradead.org, linux-ia64@...r.kernel.org,
linux-s390@...r.kernel.org, sparclinux@...r.kernel.org,
x86@...nel.org, linux-serial@...r.kernel.org,
linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 5/9] /dev/mem: Use more consistent data types
From: Thierry Reding <treding@...dia.com>
The xlate_dev_{kmem,mem}_ptr() functions take either a physical address
or a kernel virtual address, so data types should be phys_addr_t and
void *. They both return a kernel virtual address which is only ever
used in calls to copy_{from,to}_user(), so make variables that store it
void * rather than char * for consistency.
Also only define a weak unxlate_dev_mem_ptr() function if architectures
haven't overridden them in the asm/io.h header file.
Signed-off-by: Thierry Reding <treding@...dia.com>
---
arch/s390/include/asm/io.h | 5 +++--
arch/s390/mm/maccess.c | 4 ++--
arch/x86/include/asm/io.h | 4 ++--
arch/x86/mm/ioremap.c | 4 ++--
drivers/char/mem.c | 13 ++++++++-----
5 files changed, 17 insertions(+), 13 deletions(-)
diff --git a/arch/s390/include/asm/io.h b/arch/s390/include/asm/io.h
index cd6b9ee7b69c..d22c2eeae78f 100644
--- a/arch/s390/include/asm/io.h
+++ b/arch/s390/include/asm/io.h
@@ -13,9 +13,10 @@
#include <asm/page.h>
#include <asm/pci_io.h>
-void *xlate_dev_mem_ptr(unsigned long phys);
#define xlate_dev_mem_ptr xlate_dev_mem_ptr
-void unxlate_dev_mem_ptr(unsigned long phys, void *addr);
+void *xlate_dev_mem_ptr(phys_addr_t phys);
+#define unxlate_dev_mem_ptr unxlate_dev_mem_ptr
+void unxlate_dev_mem_ptr(phys_addr_t phys, void *addr);
/*
* Convert a virtual cached pointer to an uncached pointer
diff --git a/arch/s390/mm/maccess.c b/arch/s390/mm/maccess.c
index 2a2e35416d2f..2eb34bdfc613 100644
--- a/arch/s390/mm/maccess.c
+++ b/arch/s390/mm/maccess.c
@@ -176,7 +176,7 @@ static int is_swapped(unsigned long addr)
* For swapped prefix pages a new buffer is returned that contains a copy of
* the absolute memory. The buffer size is maximum one page large.
*/
-void *xlate_dev_mem_ptr(unsigned long addr)
+void *xlate_dev_mem_ptr(phys_addr_t addr)
{
void *bounce = (void *) addr;
unsigned long size;
@@ -197,7 +197,7 @@ void *xlate_dev_mem_ptr(unsigned long addr)
/*
* Free converted buffer for /dev/mem access (if necessary)
*/
-void unxlate_dev_mem_ptr(unsigned long addr, void *buf)
+void unxlate_dev_mem_ptr(phys_addr_t addr, void *buf)
{
if ((void *) addr != buf)
free_page((unsigned long) buf);
diff --git a/arch/x86/include/asm/io.h b/arch/x86/include/asm/io.h
index b8237d8a1e0c..ae2b593e7c6e 100644
--- a/arch/x86/include/asm/io.h
+++ b/arch/x86/include/asm/io.h
@@ -310,8 +310,8 @@ BUILDIO(b, b, char)
BUILDIO(w, w, short)
BUILDIO(l, , int)
-extern void *xlate_dev_mem_ptr(unsigned long phys);
-extern void unxlate_dev_mem_ptr(unsigned long phys, void *addr);
+extern void *xlate_dev_mem_ptr(phys_addr_t phys);
+extern void unxlate_dev_mem_ptr(phys_addr_t phys, void *addr);
extern int ioremap_change_attr(unsigned long vaddr, unsigned long size,
unsigned long prot_val);
diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c
index af78e50ca6ce..b12f43c192cf 100644
--- a/arch/x86/mm/ioremap.c
+++ b/arch/x86/mm/ioremap.c
@@ -327,7 +327,7 @@ EXPORT_SYMBOL(iounmap);
* Convert a physical pointer to a virtual kernel pointer for /dev/mem
* access
*/
-void *xlate_dev_mem_ptr(unsigned long phys)
+void *xlate_dev_mem_ptr(phys_addr_t phys)
{
void *addr;
unsigned long start = phys & PAGE_MASK;
@@ -343,7 +343,7 @@ void *xlate_dev_mem_ptr(unsigned long phys)
return addr;
}
-void unxlate_dev_mem_ptr(unsigned long phys, void *addr)
+void unxlate_dev_mem_ptr(phys_addr_t phys, void *addr)
{
if (page_is_ram(phys >> PAGE_SHIFT))
return;
diff --git a/drivers/char/mem.c b/drivers/char/mem.c
index 524b707894ef..4c58333b4257 100644
--- a/drivers/char/mem.c
+++ b/drivers/char/mem.c
@@ -84,9 +84,12 @@ static inline int range_is_allowed(unsigned long pfn, unsigned long size)
}
#endif
-void __weak unxlate_dev_mem_ptr(unsigned long phys, void *addr)
+#ifndef unxlate_dev_mem_ptr
+#define unxlate_dev_mem_ptr unxlate_dev_mem_ptr
+void __weak unxlate_dev_mem_ptr(phys_addr_t phys, void *addr)
{
}
+#endif
/*
* This funcion reads the *physical* memory. The f_pos points directly to the
@@ -97,7 +100,7 @@ static ssize_t read_mem(struct file *file, char __user *buf,
{
phys_addr_t p = *ppos;
ssize_t read, sz;
- char *ptr;
+ void *ptr;
if (p != *ppos)
return 0;
@@ -400,7 +403,7 @@ static ssize_t read_kmem(struct file *file, char __user *buf,
* uncached, then it must also be accessed uncached
* by the kernel or data corruption may occur
*/
- kbuf = xlate_dev_kmem_ptr((char *)p);
+ kbuf = xlate_dev_kmem_ptr((void *)p);
if (copy_to_user(buf, kbuf, sz))
return -EFAULT;
@@ -461,7 +464,7 @@ static ssize_t do_write_kmem(unsigned long p, const char __user *buf,
#endif
while (count > 0) {
- char *ptr;
+ void *ptr;
sz = size_inside_page(p, count);
@@ -470,7 +473,7 @@ static ssize_t do_write_kmem(unsigned long p, const char __user *buf,
* it must also be accessed uncached by the kernel or data
* corruption may occur.
*/
- ptr = xlate_dev_kmem_ptr((char *)p);
+ ptr = xlate_dev_kmem_ptr((void *)p);
copied = copy_from_user(ptr, buf, sz);
if (copied) {
--
2.1.0
--
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