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

diff --git a/arch/x86/events/perf_event.h b/arch/x86/events/perf_event.h
index e17a3d8a47ede37fb4eddc48c2ba0159e919f0ed..eb37f6c43c964c65750944c93235b3dd51cab513 100644 (file)
--- a/arch/x86/events/perf_event.h
+++ b/arch/x86/events/perf_event.h
@@ -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 */