perf/x86/intel: Fix and clean up intel_pmu_drain_arch_pebs() type use

The following commit introduced a build failure on x86-32:

  21954c8a0ff ("perf/x86/intel: Process arch-PEBS records or record fragments")

  ...

  arch/x86/events/intel/ds.c:2983:24: error: cast from pointer to integer of different size [-Werror=pointer-to-int-cast]

The forced type conversion to 'u64' and 'void *' are not 32-bit clean,
but they are also entirely unnecessary: ->pebs_vaddr is 'void *' already,
and integer-compatible pointer arithmetics will work just fine on it.

Fix & simplify the code.

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Fixes: d21954c8a0ff ("perf/x86/intel: Process arch-PEBS records or record fragments")
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Dapeng Mi <dapeng1.mi@linux.intel.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Link: https://patch.msgid.link/20251029102136.61364-10-dapeng1.mi@linux.intel.com

diff --git a/arch/x86/events/intel/ds.c b/arch/x86/events/intel/ds.c
index c93bf971d97b9e938ac6bf3223563fc5361d48d3..2e170f2093acd9cd74bb5dd71370c375c869820d 100644 (file)
--- a/arch/x86/events/intel/ds.c
+++ b/arch/x86/events/intel/ds.c
@@ -2979,8 +2979,7 @@ static void intel_pmu_drain_arch_pebs(struct pt_regs *iregs,
        }
 
        base = cpuc->pebs_vaddr;
-       top = (void *)((u64)cpuc->pebs_vaddr +
-                      (index.wr << ARCH_PEBS_INDEX_WR_SHIFT));
+       top = cpuc->pebs_vaddr + (index.wr << ARCH_PEBS_INDEX_WR_SHIFT);
 
        index.wr = 0;
        index.full = 0;