linux-kernel - [PATCH 0/9] arm64: add more accurate code for tracing the hardirq flags changes

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Date:	Mon, 30 May 2016 10:52:21 +0800
From:	Huang Shijie <shijie.huang@....com>
To:	<catalin.marinas@....com>
CC:	<will.deacon@....com>, <nd@....com>, <mark.rutland@....com>,
	<marc.zyngier@....com>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <steve.capper@....com>,
	<cmetcalf@...lanox.com>, Huang Shijie <shijie.huang@....com>
Subject: [PATCH 0/9] arm64: add more accurate code for tracing the hardirq flags changes

In the current arm64 code, we trace the hardirq flags change occasionally.
Sometimes, the trace code is buggy, such as the el0_irq.

This patch sets 
   0.) in order to avoid the save/restore registers, add patches to adjust
        the code.
   1.) add the trace code at the entry/exit, 
   2.) add the trace code at the irq macros.
   3.) removes the duplicated trace code.

I tested this patch set with CONFIG_PROVE_LOCKING/CONFIG_LOCKDEP/CONFIG_LOCK_STAT
enabled in the Juno-r1 board.

The whole patch set is based on the patch: 
    http://lists.infradead.org/pipermail/linux-arm-kernel/2016-April/420154.html

Thanks to the code review of Steve/James/Mark, I really appriciate it.

Huang Shijie (9):
  arm64: entry: use the callee-saved registers to save some registers
  arm64: entry: add a new macro to restore the registers for syscall
  arm64: entry: record the hardirq changes on the entry/exit code
  arm64: entry: remove the duplicated code for tracing the IRQ flags
  arm64: entry: only restore the syscall registers once
  arm64: entry: adjust el1_sync so that a function can be called
  arm64: entry: save the x0 back into the stack before disabling the
    interrupt
  arm64: add the hardirq flags trace code for irq macros
  arm64: entry: remove the duplicated hardirq flags trace code

 arch/arm64/include/asm/assembler.h |  9 ++++
 arch/arm64/kernel/entry.S          | 88 ++++++++++++++++++++++----------------
 arch/arm64/kernel/signal.c         |  6 ---
 arch/arm64/mm/fault.c              | 10 -----
 4 files changed, 59 insertions(+), 54 deletions(-)

-- 
2.5.5