linux-kernel - [PATCH v10 01/11] perf/x86: Fix variable type for LBR registers

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20200423081412.164863-2-like.xu@linux.intel.com>
Date:   Thu, 23 Apr 2020 16:14:02 +0800
From:   Like Xu <like.xu@...ux.intel.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Sean Christopherson <sean.j.christopherson@...el.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, wei.w.wang@...el.com,
        ak@...ux.intel.com, Peter Zijlstra <peterz@...radead.org>
Subject: [PATCH v10 01/11] perf/x86: Fix variable type for LBR registers

From: Wei Wang <wei.w.wang@...el.com>

The msr variable type can be 'unsigned int', which uses less memory than
the longer 'unsigned long'. Fix 'struct x86_pmu' for that. The lbr_nr won't
be a negative number, so make it 'unsigned int' as well.

Cc: Peter Zijlstra (Intel) <peterz@...radead.org>
Suggested-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Signed-off-by: Wei Wang <wei.w.wang@...el.com>
---
 arch/x86/events/perf_event.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/events/perf_event.h b/arch/x86/events/perf_event.h
index f1cd1ca1a77b..1025bc6eb04f 100644
--- a/arch/x86/events/perf_event.h
+++ b/arch/x86/events/perf_event.h
@@ -672,8 +672,8 @@ struct x86_pmu {
 	/*
 	 * Intel LBR
 	 */
-	unsigned long	lbr_tos, lbr_from, lbr_to; /* MSR base regs       */
-	int		lbr_nr;			   /* hardware stack size */
+	unsigned int	lbr_tos, lbr_from, lbr_to,
+			lbr_nr;			   /* LBR base regs and size */
 	u64		lbr_sel_mask;		   /* LBR_SELECT valid bits */
 	const int	*lbr_sel_map;		   /* lbr_select mappings */
 	bool		lbr_double_abort;	   /* duplicated lbr aborts */
-- 
2.21.1