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
