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Date: Thu, 28 Feb 2019 03:04:02 -0800 From: tip-bot for Lan Tianyu <tipbot@...or.com> To: linux-tip-commits@...r.kernel.org Cc: mingo@...nel.org, Tianyu.Lan@...rosoft.com, hpa@...or.com, tglx@...utronix.de, linux-kernel@...r.kernel.org Subject: [tip:x86/urgent] x86/hyper-v: Fix definition of HV_MAX_FLUSH_REP_COUNT Commit-ID: 9cd05ad2910b55238e3c720c99ad896dc538301b Gitweb: https://git.kernel.org/tip/9cd05ad2910b55238e3c720c99ad896dc538301b Author: Lan Tianyu <Tianyu.Lan@...rosoft.com> AuthorDate: Mon, 25 Feb 2019 22:31:14 +0800 Committer: Thomas Gleixner <tglx@...utronix.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.Lan@...rosoft.com> Signed-off-by: Thomas Gleixner <tglx@...utronix.de> Cc: kys@...rosoft.com Cc: haiyangz@...rosoft.com Cc: sthemmin@...rosoft.com Cc: sashal@...nel.org Cc: bp@...en8.de Cc: hpa@...or.com Cc: gregkh@...uxfoundation.org Cc: devel@...uxdriverproject.org Cc: stable@...r.kernel.org Link: https://lkml.kernel.org/r/20190225143114.5149-1-Tianyu.Lan@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 {
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