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From:   Mark Salyzyn <salyzyn@android.com>
To:     linux-kernel@vger.kernel.org
Cc:     Mark Salyzyn <salyzyn@android.com>,
        James Morse <james.morse@arm.com>,
        Russell King <linux@armlinux.org.uk>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will.deacon@arm.com>,
        Andy Lutomirski <luto@amacapital.net>,
        Dmitry Safonov <dsafonov@virtuozzo.com>,
        John Stultz <john.stultz@linaro.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Laura Abbott <labbott@redhat.com>,
        Kees Cook <keescook@chromium.org>,
        Ard Biesheuvel <ard.biesheuvel@linaro.org>,
        Andy Gross <andy.gross@linaro.org>,
        Kevin Brodsky <kevin.brodsky@arm.com>,
        Andrew Pinski <apinski@cavium.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        linux-arm-kernel@lists.infradead.org,
        Jeremy Linton <Jeremy.Linton@arm.com>,
        Kate Stewart <kstewart@linuxfoundation.org>,
        Philippe Ombredanne <pombredanne@nexb.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Dmitry Vyukov <dvyukov@google.com>
Subject: RESEND [PATCH v5 07/12] arm: vdso: disable profiling
Date:   Mon, 18 Jun 2018 08:05:53 -0700
Message-Id: <20180618150613.10322-8-salyzyn@android.com>
In-Reply-To: <20180618150613.10322-1-salyzyn@android.com>
References: <20180618150613.10322-1-salyzyn@android.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Take an effort to recode the arm64 vdso code from assembler to C
previously submitted by Andrew Pinski <apinski@cavium.com>, rework
it for use in both arm and arm64, overlapping any optimizations
for each architecture. But instead of landing it in arm64, land the
result into lib/vdso and unify both implementations to simplify
future maintenance.

Make sure kasan and ubsan profiling, and kcov instrumentation,
is turned off for VDSO code.

Signed-off-by: Mark Salyzyn <salyzyn@android.com>
Cc: James Morse <james.morse@arm.com>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dmitry Safonov <dsafonov@virtuozzo.com>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Laura Abbott <labbott@redhat.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Andy Gross <andy.gross@linaro.org>
Cc: Kevin Brodsky <kevin.brodsky@arm.com>
Cc: Andrew Pinski <apinski@cavium.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: Jeremy Linton <Jeremy.Linton@arm.com>

v2:
- Added this to the split up of first CL, based on comments in second CL

v4:
- update commit message to reflect overall reasoning

v5:
- rebase
---
 arch/arm/vdso/Makefile | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/arm/vdso/Makefile b/arch/arm/vdso/Makefile
index f4efff9d3afb..1125e3fb8006 100644
--- a/arch/arm/vdso/Makefile
+++ b/arch/arm/vdso/Makefile
@@ -27,8 +27,11 @@ CFLAGS_REMOVE_vdso.o = -pg
 CFLAGS_REMOVE_vgettimeofday.o = -pg -Os
 CFLAGS_vgettimeofday.o = -O2
 
-# Disable gcov profiling for VDSO code
+# Disable gcov, kasan, ubsan and kcov profiling for VDSO code
 GCOV_PROFILE := n
+KASAN_SANITIZE := n
+UBSAN_SANITIZE := n
+KCOV_INSTRUMENT := n
 
 # Prevents link failures: __sanitizer_cov_trace_pc() is not linked in.
 KCOV_INSTRUMENT := n
-- 
2.18.0.rc1.244.gcf134e6275-goog