From 9ef8dc161faaa24c58322aa928b3216213621daa Mon Sep 17 00:00:00 2001 From: "Michael S. Tsirkin" Date: Tue, 6 Jan 2015 14:37:22 +0200 Subject: metag: 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. This also fixes warnings due to writing a pointer out to userland. Note: this does not suppress any useful sparse checks since callers do a cast (__typeof__(*(ptr))) (x) which in turn forces all the necessary type checks. Suggested-by: James Hogan Signed-off-by: Michael S. Tsirkin Acked-by: James Hogan --- arch/metag/include/asm/uaccess.h | 21 +++++++++++++-------- 1 file changed, 13 insertions(+), 8 deletions(-) (limited to 'arch/metag') diff --git a/arch/metag/include/asm/uaccess.h b/arch/metag/include/asm/uaccess.h index fd863fead4af..8282cbce7e39 100644 --- a/arch/metag/include/asm/uaccess.h +++ b/arch/metag/include/asm/uaccess.h @@ -107,18 +107,23 @@ extern long __put_user_asm_w(unsigned int x, void __user *addr); extern long __put_user_asm_d(unsigned int x, void __user *addr); extern long __put_user_asm_l(unsigned long long x, void __user *addr); -#define __put_user_size(x, ptr, size, retval) \ -do { \ - retval = 0; \ - switch (size) { \ +#define __put_user_size(x, ptr, size, retval) \ +do { \ + retval = 0; \ + switch (size) { \ case 1: \ - retval = __put_user_asm_b((unsigned int)x, ptr); break; \ + retval = __put_user_asm_b((__force unsigned int)x, ptr);\ + break; \ case 2: \ - retval = __put_user_asm_w((unsigned int)x, ptr); break; \ + retval = __put_user_asm_w((__force unsigned int)x, ptr);\ + break; \ case 4: \ - retval = __put_user_asm_d((unsigned int)x, ptr); break; \ + retval = __put_user_asm_d((__force unsigned int)x, ptr);\ + break; \ case 8: \ - retval = __put_user_asm_l((unsigned long long)x, ptr); break; \ + retval = __put_user_asm_l((__force unsigned long long)x,\ + ptr); \ + break; \ default: \ __put_user_bad(); \ } \ -- cgit v1.2.3