Commit 3cb9d546 authored Jun 13, 2020 by Wei Wang Committed by Peter Zijlstra Jul 02, 2020

perf/x86: Fix variable types for LBR registers

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.

Suggested-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Wei Wang <wei.w.wang@intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20200613080958.132489-2-like.xu@linux.intel.com

parent 9ebcfadb

arch/x86/events/perf_event.h

+2 −2

Original line number	Diff line number	Diff line
		@@ -673,8 +673,8 @@ 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 */