linux-kernel - [PATCH 02/13] perf/core: Extend perf_sample_regs_intr() to include perf_arch

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Date:   Mon, 29 Aug 2016 02:30:47 +0530
From:   Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>
To:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Cc:     Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Jiri Olsa <jolsa@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Stephane Eranian <eranian@...il.com>,
        Russell King <linux@....linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
Subject: [PATCH 02/13] perf/core: Extend perf_sample_regs_intr() to include perf_arch_regs update

Extend perf_sample_regs_intr() to support the updates needed for
perf_arch_reg structure and perf_arch_regs_mask. Also add code to
init the arch_regs_mask to zero incase of regs_user in
perf_sample_regs_user(). Ideally this should be done in perf_sample_data_init,
but due to commit 2565711fb7d7 ("perf: Improve the perf_sample_data struct layout")
moving it to this function.

Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Stephane Eranian <eranian@...il.com>
Cc: Russell King <linux@....linux.org.uk>
Cc: Catalin Marinas <catalin.marinas@....com>
Cc: Will Deacon <will.deacon@....com>
Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc: Michael Ellerman <mpe@...erman.id.au>
Cc: Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>
---
 kernel/events/core.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/kernel/events/core.c b/kernel/events/core.c
index 2f6e6a16b117..8cf540275c34 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -5398,6 +5398,9 @@ static void perf_sample_regs_user(struct perf_regs *regs_user,
 		regs_user->abi = PERF_SAMPLE_REGS_ABI_NONE;
 		regs_user->regs = NULL;
 	}
+
+	/* Init arch_regs_mask to zero */
+	regs_user->arch_regs_mask = 0;
 }
 
 static void perf_sample_regs_intr(struct perf_regs *regs_intr,
@@ -5405,6 +5408,8 @@ static void perf_sample_regs_intr(struct perf_regs *regs_intr,
 {
 	regs_intr->regs = regs;
 	regs_intr->abi  = perf_reg_abi(current);
+	regs_intr->arch_regs_mask = perf_get_arch_regs_mask();
+	regs_intr->arch_regs = perf_get_arch_reg();
 }
 
 
-- 
2.7.4