diff options
| author | Michael S. Tsirkin <mst@redhat.com> | 2015-01-06 14:37:22 +0200 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2015-01-13 15:23:36 +0200 |
| commit | 9ef8dc161faaa24c58322aa928b3216213621daa (patch) | |
| tree | 81d63064c315af3aaa2deec13bfcdd0744d63eb2 | |
| parent | 9605ce7e5fe058c94fa354415d122462fb419a00 (diff) | |
| download | linux-9ef8dc161faaa24c58322aa928b3216213621daa.tar.bz2 | |
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 <james.hogan@imgtec.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: James Hogan <james.hogan@imgtec.com>
| -rw-r--r-- | arch/metag/include/asm/uaccess.h | 21 |
1 files changed, 13 insertions, 8 deletions
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(); \ } \ |