Commit-ID: 9cd05ad2910b55238e3c720c99ad896dc538301b
Gitweb: https://git.kernel.org/tip/9cd05ad2910b55238e3c720c99ad896dc538301b
Author: Lan Tianyu <tianyu....@microsoft.com>
AuthorDate: Mon, 25 Feb 2019 22:31:14 +0800
Committer: Thomas Gleixner <t...@linutronix.de>
CommitDate: Thu, 28 Feb 2019 11:58:29 +0100
x86/hyper-v: Fix definition of HV_MAX_FLUSH_REP_COUNT
The max flush rep count of HvFlushGuestPhysicalAddressList hypercall is
equal with how many entries of union hv_gpa_page_range can be populated
into the input parameter page.
The code lacks parenthesis around PAGE_SIZE - 2 * sizeof(u64) which results
in bogus computations. Add them.
Fixes: cc4edae4b924 ("x86/hyper-v: Add HvFlushGuestAddressList hypercall
support")
Signed-off-by: Lan Tianyu <tianyu....@microsoft.com>
Signed-off-by: Thomas Gleixner <t...@linutronix.de>
Cc: k...@microsoft.com
Cc: haiya...@microsoft.com
Cc: sthem...@microsoft.com
Cc: sas...@kernel.org
Cc: b...@alien8.de
Cc: h...@zytor.com
Cc: gre...@linuxfoundation.org
Cc: de...@linuxdriverproject.org
Cc: sta...@vger.kernel.org
Link: https://lkml.kernel.org/r/20190225143114.5149-1-tianyu....@microsoft.com
---
arch/x86/include/asm/hyperv-tlfs.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/include/asm/hyperv-tlfs.h
b/arch/x86/include/asm/hyperv-tlfs.h
index 705dafc2d11a..2bdbbbcfa393 100644
--- a/arch/x86/include/asm/hyperv-tlfs.h
+++ b/arch/x86/include/asm/hyperv-tlfs.h
@@ -841,7 +841,7 @@ union hv_gpa_page_range {
* count is equal with how many entries of union hv_gpa_page_range can
* be populated into the input parameter page.
*/
-#define HV_MAX_FLUSH_REP_COUNT (PAGE_SIZE - 2 * sizeof(u64) / \
+#define HV_MAX_FLUSH_REP_COUNT ((PAGE_SIZE - 2 * sizeof(u64)) / \
sizeof(union hv_gpa_page_range))
struct hv_guest_mapping_flush_list {
