lkml.org 
[lkml]   [2020]   [Mar]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v9 01/10] perf/x86: Fix msr variable type for the LBR msrs
Date
From: Wei Wang <wei.w.wang@intel.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: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Suggested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Wei Wang <wei.w.wang@intel.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
\
 
 \ /
  Last update: 2020-03-13 03:19    [W:0.136 / U:22.192 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site