From: shijie.huang@arm.com (Huang Shijie)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 7/9] arm64: entry: save the x0 back into the stack before disabling the interrupt
Date: Mon, 30 May 2016 10:52:28 +0800 [thread overview]
Message-ID: <1464576750-25160-8-git-send-email-shijie.huang@arm.com> (raw)
In-Reply-To: <1464576750-25160-1-git-send-email-shijie.huang@arm.com>
We will add the hardirq flags trace code in the disable_irq, the trace
code may changes the x0, so save the x0 back into the stack before
disabling the interrupt,
This patch makes preparation for the later patch.
Signed-off-by: Huang Shijie <shijie.huang@arm.com>
---
arch/arm64/kernel/entry.S | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S
index 63bf7ad..7005789 100644
--- a/arch/arm64/kernel/entry.S
+++ b/arch/arm64/kernel/entry.S
@@ -672,8 +672,8 @@ ENDPROC(cpu_switch_to)
* and this includes saving x0 back into the kernel stack.
*/
ret_fast_syscall:
- disable_irq // disable interrupts
str x0, [sp, #S_X0] // returned x0
+ disable_irq // disable interrupts
ldr x1, [tsk, #TI_FLAGS] // re-check for syscall tracing
and x2, x1, #_TIF_SYSCALL_WORK
cbnz x2, ret_fast_syscall_trace
--
2.5.5
next prev parent reply other threads:[~2016-05-30 2:52 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-30 2:52 [PATCH 0/9] arm64: add more accurate code for tracing the hardirq flags changes Huang Shijie
2016-05-30 2:52 ` [PATCH 1/9] arm64: entry: use the callee-saved registers to save some registers Huang Shijie
2016-05-30 2:52 ` [PATCH 2/9] arm64: entry: add a new macro to restore the registers for syscall Huang Shijie
2016-05-30 2:52 ` [PATCH 3/9] arm64: entry: record the hardirq changes on the entry/exit code Huang Shijie
2016-05-30 2:52 ` [PATCH 4/9] arm64: entry: remove the duplicated code for tracing the IRQ flags Huang Shijie
2016-05-30 2:52 ` [PATCH 5/9] arm64: entry: only restore the syscall registers once Huang Shijie
2016-05-30 2:52 ` [PATCH 6/9] arm64: entry: adjust el1_sync so that a function can be called Huang Shijie
2016-05-30 2:52 ` Huang Shijie [this message]
2016-05-30 2:52 ` [PATCH 8/9] arm64: add the hardirq flags trace code for irq macros Huang Shijie
2016-05-30 2:52 ` [PATCH 9/9] arm64: entry: remove the duplicated hardirq flags trace code Huang Shijie
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