From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Michael S. Tsirkin" Date: Tue, 06 Jan 2015 15:44:41 +0000 Subject: [PATCH v2 21/40] sh: fix put_user sparse errors Message-Id: <1420558883-10131-22-git-send-email-mst@redhat.com> List-Id: References: <1420558883-10131-1-git-send-email-mst@redhat.com> In-Reply-To: <1420558883-10131-1-git-send-email-mst@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-kernel@vger.kernel.org Cc: Arnd Bergmann , linux-arch@vger.kernel.org, linux-sh@vger.kernel.org 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 --- arch/sh/include/asm/uaccess_64.h | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/arch/sh/include/asm/uaccess_64.h b/arch/sh/include/asm/uaccess_64.h index 2e07e0f..c01376c 100644 --- a/arch/sh/include/asm/uaccess_64.h +++ b/arch/sh/include/asm/uaccess_64.h @@ -59,19 +59,19 @@ do { \ switch (size) { \ case 1: \ retval = __put_user_asm_b((void *)&x, \ - (long)ptr); \ + (__force long)ptr); \ break; \ case 2: \ retval = __put_user_asm_w((void *)&x, \ - (long)ptr); \ + (__force long)ptr); \ break; \ case 4: \ retval = __put_user_asm_l((void *)&x, \ - (long)ptr); \ + (__force long)ptr); \ break; \ case 8: \ retval = __put_user_asm_q((void *)&x, \ - (long)ptr); \ + (__force long)ptr); \ break; \ default: \ __put_user_unknown(); \ -- MST