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Message-ID: <1420558883-10131-19-git-send-email-mst@redhat.com>
Date: Tue, 6 Jan 2015 17:44:31 +0200
From: "Michael S. Tsirkin" <mst@...hat.com>
To: linux-kernel@...r.kernel.org
Cc: Arnd Bergmann <arnd@...db.de>, linux-arch@...r.kernel.org,
Steven Miao <realmz6@...il.com>,
adi-buildroot-devel@...ts.sourceforge.net
Subject: [PATCH v2 18/40] blackfin: fix put_user sparse errors
virtio wants to write bitwise types to userspace using put_user.
At the moment this triggers sparse errors, since the value is passed
through an integer.
For example:
__le32 __user *p;
__le32 x;
put_user(x, p);
is safe, but currently triggers a sparse warning.
Fix that up using __force.
Note: this does not suppress any useful sparse checks since caller
assigns x to typeof(*p), which in turn forces all the necessary type
checks.
Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
---
arch/blackfin/include/asm/uaccess.h | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/arch/blackfin/include/asm/uaccess.h b/arch/blackfin/include/asm/uaccess.h
index 2dcc930..4bf968c 100644
--- a/arch/blackfin/include/asm/uaccess.h
+++ b/arch/blackfin/include/asm/uaccess.h
@@ -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(); \
--
MST
--
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