From: AKASHI Takahiro <takahiro.akashi@linaro.org>
Date: Wed, 30 Apr 2014 09:54:36 +0000 (+0100)
Subject: arm64: ftrace: Add system call tracepoint
X-Git-Tag: omap-for-v3.16/fixes-against-rc1~91^2~10^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=055b1212d141f1f398fca548f8147787c0b6253f;p=pandora-kernel.git

arm64: ftrace: Add system call tracepoint

This patch allows system call entry or exit to be traced as ftrace events,
ie. sys_enter_*/sys_exit_*, if CONFIG_FTRACE_SYSCALLS is enabled.
Those events appear and can be controlled under
    ${sysfs}/tracing/events/syscalls/

Please note that we can't trace compat system calls here because
AArch32 mode does not share the same syscall table with AArch64.
Just define ARCH_TRACE_IGNORE_COMPAT_SYSCALLS in order to avoid unexpected
results (bogus syscalls reported or even hang-up).

Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
---

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