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authorArnd Bergmann <arnd@arndb.de>2015-01-14 23:17:49 +0100
committerArnd Bergmann <arnd@arndb.de>2015-01-14 23:17:49 +0100
commit643165c8bbc8617d8222cb50c89e34fe64d226cf (patch)
treee2a88de9b8efb0c9fa2436f53b0a3ab4948c4a55 /arch/blackfin
parenteaa27f34e91a14cdceed26ed6c6793ec1d186115 (diff)
parent0795cb1b46e7938ed679ccd48f933e75272b30e3 (diff)
downloadop-kernel-dev-643165c8bbc8617d8222cb50c89e34fe64d226cf.zip
op-kernel-dev-643165c8bbc8617d8222cb50c89e34fe64d226cf.tar.gz
Merge tag 'uaccess_for_upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost into asm-generic
Merge "uaccess: fix sparse warning on get/put_user for bitwise types" from Michael S. Tsirkin: At the moment, if p and x are both tagged as bitwise types, some of get_user(x, p), put_user(x, p), __get_user(x, p), __put_user(x, p) might produce a sparse warning on many architectures. This is a false positive: *p on these architectures is loaded into long (typically using asm), then cast back to typeof(*p). When typeof(*p) is a bitwise type (which is uncommon), such a cast needs __force, otherwise sparse produces a warning. Some architectures already have the __force tag, add it where it's missing. I verified that adding these __force casts does not supress any useful warnings. Specifically, vhost wants to read/write bitwise types in userspace memory using get_user/put_user. At the moment this triggers sparse errors, since the value is passed through an integer. For example: __le32 __user *p; __u32 x; both put_user(x, p); and get_user(x, p); should be safe, but produce warnings on some architectures. While there, I noticed that a bunch of architectures violated coding style rules within uaccess macros. Included patches to fix them up. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Arnd Bergmann <arnd@arndb.de> * tag 'uaccess_for_upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost: (37 commits) sparc32: nocheck uaccess coding style tweaks sparc64: nocheck uaccess coding style tweaks xtensa: macro whitespace fixes sh: macro whitespace fixes parisc: macro whitespace fixes m68k: macro whitespace fixes m32r: macro whitespace fixes frv: macro whitespace fixes cris: macro whitespace fixes avr32: macro whitespace fixes arm64: macro whitespace fixes arm: macro whitespace fixes alpha: macro whitespace fixes blackfin: macro whitespace fixes sparc64: uaccess_64 macro whitespace fixes sparc32: uaccess_32 macro whitespace fixes avr32: whitespace fix sh: fix put_user sparse errors metag: fix put_user sparse errors ia64: fix put_user sparse errors ...
Diffstat (limited to 'arch/blackfin')
-rw-r--r--arch/blackfin/include/asm/uaccess.h32
1 files changed, 16 insertions, 16 deletions
diff --git a/arch/blackfin/include/asm/uaccess.h b/arch/blackfin/include/asm/uaccess.h
index 57701c3..90612a7 100644
--- a/arch/blackfin/include/asm/uaccess.h
+++ b/arch/blackfin/include/asm/uaccess.h
@@ -27,7 +27,7 @@ static inline void set_fs(mm_segment_t fs)
current_thread_info()->addr_limit = fs;
}
-#define segment_eq(a,b) ((a) == (b))
+#define segment_eq(a, b) ((a) == (b))
#define VERIFY_READ 0
#define VERIFY_WRITE 1
@@ -68,11 +68,11 @@ struct exception_table_entry {
* use the right size if we just have the right pointer type.
*/
-#define put_user(x,p) \
+#define put_user(x, p) \
({ \
int _err = 0; \
typeof(*(p)) _x = (x); \
- typeof(*(p)) __user *_p = (p); \
+ typeof(*(p)) __user *_p = (p); \
if (!access_ok(VERIFY_WRITE, _p, sizeof(*(_p)))) {\
_err = -EFAULT; \
} \
@@ -89,10 +89,10 @@ struct exception_table_entry {
break; \
case 8: { \
long _xl, _xh; \
- _xl = ((long *)&_x)[0]; \
- _xh = ((long *)&_x)[1]; \
- __put_user_asm(_xl, ((long __user *)_p)+0, ); \
- __put_user_asm(_xh, ((long __user *)_p)+1, ); \
+ _xl = ((__force long *)&_x)[0]; \
+ _xh = ((__force long *)&_x)[1]; \
+ __put_user_asm(_xl, ((__force long __user *)_p)+0, );\
+ __put_user_asm(_xh, ((__force long __user *)_p)+1, );\
} break; \
default: \
_err = __put_user_bad(); \
@@ -102,7 +102,7 @@ struct exception_table_entry {
_err; \
})
-#define __put_user(x,p) put_user(x,p)
+#define __put_user(x, p) put_user(x, p)
static inline int bad_user_access_length(void)
{
panic("bad_user_access_length");
@@ -121,10 +121,10 @@ static inline int bad_user_access_length(void)
#define __ptr(x) ((unsigned long __force *)(x))
-#define __put_user_asm(x,p,bhw) \
+#define __put_user_asm(x, p, bhw) \
__asm__ (#bhw"[%1] = %0;\n\t" \
: /* no outputs */ \
- :"d" (x),"a" (__ptr(p)) : "memory")
+ :"d" (x), "a" (__ptr(p)) : "memory")
#define get_user(x, ptr) \
({ \
@@ -136,10 +136,10 @@ static inline int bad_user_access_length(void)
BUILD_BUG_ON(ptr_size >= 8); \
switch (ptr_size) { \
case 1: \
- __get_user_asm(_val, _p, B,(Z)); \
+ __get_user_asm(_val, _p, B, (Z)); \
break; \
case 2: \
- __get_user_asm(_val, _p, W,(Z)); \
+ __get_user_asm(_val, _p, W, (Z)); \
break; \
case 4: \
__get_user_asm(_val, _p, , ); \
@@ -147,11 +147,11 @@ static inline int bad_user_access_length(void)
} \
} else \
_err = -EFAULT; \
- x = (typeof(*(ptr)))_val; \
+ x = (__force typeof(*(ptr)))_val; \
_err; \
})
-#define __get_user(x,p) get_user(x,p)
+#define __get_user(x, p) get_user(x, p)
#define __get_user_bad() (bad_user_access_length(), (-EFAULT))
@@ -168,10 +168,10 @@ static inline int bad_user_access_length(void)
#define __copy_to_user_inatomic __copy_to_user
#define __copy_from_user_inatomic __copy_from_user
-#define copy_to_user_ret(to,from,n,retval) ({ if (copy_to_user(to,from,n))\
+#define copy_to_user_ret(to, from, n, retval) ({ if (copy_to_user(to, from, n))\
return retval; })
-#define copy_from_user_ret(to,from,n,retval) ({ if (copy_from_user(to,from,n))\
+#define copy_from_user_ret(to, from, n, retval) ({ if (copy_from_user(to, from, n))\
return retval; })
static inline unsigned long __must_check
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