linux-kernel - [POC PATCH 14/17] perf/x86/regs: Only support legacy regs for the PT and PERF_REGS

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Message-Id: <20250815213435.1702022-15-kan.liang@linux.intel.com>
Date: Fri, 15 Aug 2025 14:34:32 -0700
From: kan.liang@...ux.intel.com
To: peterz@...radead.org,
	mingo@...hat.com,
	acme@...nel.org,
	namhyung@...nel.org,
	tglx@...utronix.de,
	dave.hansen@...ux.intel.com,
	irogers@...gle.com,
	adrian.hunter@...el.com,
	jolsa@...nel.org,
	alexander.shishkin@...ux.intel.com,
	linux-kernel@...r.kernel.org
Cc: dapeng1.mi@...ux.intel.com,
	ak@...ux.intel.com,
	zide.chen@...el.com,
	mark.rutland@....com,
	broonie@...nel.org,
	ravi.bangoria@....com,
	eranian@...gle.com,
	Kan Liang <kan.liang@...ux.intel.com>
Subject: [POC PATCH 14/17] perf/x86/regs: Only support legacy regs for the PT and PERF_REGS_MASK for now

From: Kan Liang <kan.liang@...ux.intel.com>

The PERF_REG_X86_64_MAX is going to be updated to support more regs,
e.g., eGPRs.
However, the PT and PERF_REGS_MASK will not be touched in the POC.
Using the PERF_REG_X86_R15 + 1 to replace PERF_REG_X86_64_MAX.

Signed-off-by: Kan Liang <kan.liang@...ux.intel.com>
---
 tools/perf/arch/x86/include/perf_regs.h | 2 +-
 tools/perf/util/intel-pt.c              | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/perf/arch/x86/include/perf_regs.h b/tools/perf/arch/x86/include/perf_regs.h
index f209ce2c1dd9..793fb597b03f 100644
--- a/tools/perf/arch/x86/include/perf_regs.h
+++ b/tools/perf/arch/x86/include/perf_regs.h
@@ -17,7 +17,7 @@ void perf_regs_load(u64 *regs);
 		       (1ULL << PERF_REG_X86_ES) | \
 		       (1ULL << PERF_REG_X86_FS) | \
 		       (1ULL << PERF_REG_X86_GS))
-#define PERF_REGS_MASK (((1ULL << PERF_REG_X86_64_MAX) - 1) & ~REG_NOSUPPORT)
+#define PERF_REGS_MASK (((1ULL << (PERF_REG_X86_R15 + 1)) - 1) & ~REG_NOSUPPORT)
 #define PERF_SAMPLE_REGS_ABI PERF_SAMPLE_REGS_ABI_64
 #endif
 
diff --git a/tools/perf/util/intel-pt.c b/tools/perf/util/intel-pt.c
index 9b1011fe4826..a9585524f2e1 100644
--- a/tools/perf/util/intel-pt.c
+++ b/tools/perf/util/intel-pt.c
@@ -2181,7 +2181,7 @@ static u64 *intel_pt_add_gp_regs(struct regs_dump *intr_regs, u64 *pos,
 	u32 bit;
 	int i;
 
-	for (i = 0, bit = 1; i < PERF_REG_X86_64_MAX; i++, bit <<= 1) {
+	for (i = 0, bit = 1; i < PERF_REG_X86_R15 + 1; i++, bit <<= 1) {
 		/* Get the PEBS gp_regs array index */
 		int n = pebs_gp_regs[i] - 1;
 
-- 
2.38.1