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[108.93.236.139]) by smtp.gmail.com with ESMTPSA id 00721157ae682-8b0e58f84c3sm16439187b3.28.2026.10.16.18.56.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 16 Oct 2026 18:56:27 -0700 (PDT) From: Matt Turner Date: Fri, 16 Oct 2026 21:55:51 -0400 Subject: [PATCH v2 5/5] alpha: fill in pc for software event samples Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20261016-alpha-perf-regs-v3-v2-5-17654742226a@gmail.com> References: <20261016-alpha-perf-regs-v3-v2-0-17654742226a@gmail.com> In-Reply-To: <20261016-alpha-perf-regs-v3-v2-0-17654742226a@gmail.com> To: Richard Henderson , Magnus Lindholm Cc: linux-alpha@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-perf-users@vger.kernel.org, Matt Turner X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=1346; i=mattst88@gmail.com; h=from:subject:message-id; bh=XzDXuW7sU8rtcOd5zk/hMQc5CYYT30++tB7FfX76MzY=; b=owGbwMvMwCW25rVmCc8sv+mMp9WSGLIuXV3McGFl+7mwrwp6NzzcLjky9fEnCTSWbbKVTfrdu kCZJbyv4yMLgxgXw0wxRZa49Yoss9p2LPU5Lf0LZg4rE8gQaZEGBiBgYeDLTcwrNdIx0jPVNtQz BDJ0jOIhcnoMGpnFxaWpRbppBUUOefkliSWZ+XnFevkFqXkF6QV6aZlpJRkZ+UXFqUAj9PJSS0x dHd2MDA1MLB0tzJwsHE1NnJ2dDJ3cHB2dXZ2MLM1NDJwtHU1cLc0ZuDgFYK45w8jwV9aXW2KKpO wFkVt84gfZwvfbTbm4h0//4nrxQK3jN8Jm7WVk+NUp2qN6LOJCXAiPIb87+6MXm1srtpqHNTzVv +zQ/GYGEwA= X-Developer-Key: i=mattst88@gmail.com; a=openpgp; fpr=3BB639E56F861FA2E86505690FDD682D974CA72A Context switch and tracepoint events have no trap frame, so perf builds one with perf_fetch_caller_regs(). Alpha does not define perf_arch_fetch_caller_regs(), which leaves that pt_regs zeroed, and these samples report pc as 0. Record the caller's address as pc. The zero ps already marks the frame as kernel mode, and pt_regs has nowhere to keep sp, so pc is all that can be filled in. Reported-by: Magnus Lindholm Closes: https://lore.kernel.org/all/CA%2B%3DFv5S8-Zk8-LUpZnWiBfTGSQXthepmRc_-a9O%2BpEPmVW0mRA@mail.gmail.com/ Assisted-by: Claude:claude-opus-5-5 Signed-off-by: Matt Turner --- arch/alpha/include/asm/perf_event.h | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/arch/alpha/include/asm/perf_event.h b/arch/alpha/include/asm/perf_event.h index 5996e7a6757e..72536566014a 100644 --- a/arch/alpha/include/asm/perf_event.h +++ b/arch/alpha/include/asm/perf_event.h @@ -1,4 +1,11 @@ #ifndef __ASM_ALPHA_PERF_EVENT_H #define __ASM_ALPHA_PERF_EVENT_H +/* + * Software events have no trap frame, so perf_fetch_caller_regs() fills + * in a zeroed pt_regs. A zero ps already means kernel mode; only pc is + * missing. + */ +#define perf_arch_fetch_caller_regs(regs, __ip) ((regs)->pc = (__ip)) + #endif /* __ASM_ALPHA_PERF_EVENT_H */ -- 2.55.0