linux-kernel - [PATCH V2] x86/Hyper-V: Fix definition HV_MAX_FLUSH_REP

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Message-Id: <20190225143114.5149-1-Tianyu.Lan@microsoft.com>
Date:   Mon, 25 Feb 2019 22:31:14 +0800
From:   lantianyu1986@...il.com
To:     kys@...rosoft.com, haiyangz@...rosoft.com, sthemmin@...rosoft.com,
        sashal@...nel.org, tglx@...utronix.de, mingo@...hat.com,
        bp@...en8.de, hpa@...or.com, x86@...nel.org,
        gregkh@...uxfoundation.org
Cc:     Lan Tianyu <Tianyu.Lan@...rosoft.com>,
        devel@...uxdriverproject.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: [PATCH V2] x86/Hyper-V: Fix definition HV_MAX_FLUSH_REP_COUNT

From: Lan Tianyu <Tianyu.Lan@...rosoft.com>

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 origin code lacks parenthesis around
PAGE_SIZE - 2 * sizeof(u64). This patch is to fix it.

Cc: <stable@...r.kernel.org>
Fixes: cc4edae4b924 ("x86/hyper-v: Add HvFlushGuestAddressList hypercall support")
Signed-off-by: Lan Tianyu <Tianyu.Lan@...rosoft.com>
---
Change since v1
	- Update change log

 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 {
-- 
2.14.4