[RESEND PATCH 0/1] Fix the "hard LOCKUP" when running a heavy loading

From: Caesar Wang <wxt-TNX95d0MmH7DzftRWevZcw@public.gmane.org>
To: Russell King <linux-lFZ/pmaqli7XmaaqVzeoHQ@public.gmane.org>,
	Heiko Stuebner <heiko-4mtYJXux2i+zQB+pC5nmwQ@public.gmane.org>
Cc: Huang Tao <huangtao-TNX95d0MmH7DzftRWevZcw@public.gmane.org>,
	Thomas Petazzoni
	<thomas.petazzoni-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>,
	hl-TNX95d0MmH7DzftRWevZcw@public.gmane.org,
	Ard Biesheuvel
	<ard.biesheuvel-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>,
	sjg-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org,
	Stephen Boyd <sboyd-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>,
	dianders-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org,
	linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	Nadav Haklai <nadavh-eYqpPyKDWXRBDgjK7y7TUQ@public.gmane.org>,
	linux-rockchip-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
	cwz-TNX95d0MmH7DzftRWevZcw@public.gmane.org,
	Jonathan Stone <j.stone-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>,
	Gregory CLEMENT
	<gregory.clement-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>,
	linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
	Caesar Wang <wxt-TNX95d0MmH7DzftRWevZcw@public.gmane.org>
Subject: [RESEND PATCH 0/1] Fix the "hard LOCKUP" when running a heavy loading
Date: Tue,  3 Nov 2015 16:10:08 +0800	[thread overview]
Message-ID: <1446538209-13490-1-git-send-email-wxt@rock-chips.com> (raw)

As the following log:
where we experience a CPU hard lockup. The assembly code (disassembled by gdb)

0xc06c6e90 <__tcp_select_window+148>:        beq     0xc06c6eb0<__tcp_select_window+180>
0xc06c6e94 <__tcp_select_window+152>:        mov     r2, #1008; 0x3f0
0xc06c6e98 <__tcp_select_window+156>:        ldr     r5, [r0,#1004] ; 0x3ec
0xc06c6e9c <__tcp_select_window+160>:        ldrh    r2, [r0,r2]
....

0xc06c6ee0 <__tcp_select_window+228>:        addne   r0, r0, #1
0xc06c6ee4 <__tcp_select_window+232>:        lslne   r0, r0, r2
0xc06c6ee8 <__tcp_select_window+236>:        ldmne   sp, {r4, r5,r11, sp,pc}

Could either the “strhi”/”strlo” pair, or the lslne/ldmne pair, be
tripping over errata 818325, or a similar errata?

0xc06c6eec <__tcp_select_window+240>:        b       0xc06c6f40<__tcp_select_window+324>

This is patch can fix the *hard lock* in some case.

As the Russell said:
"in other words, which can be handled by updating a control register in the firmware or
boot loader"
Maybe the better solution is in firmware.

Others, I'm no sure this workaround patch if can be accepted.

I resend this patch for getting some suggestion from you.

--
Thanks!

Huang Tao (1):
  ARM: errata: Workaround for Cortex-A12 erratum 818325

 arch/arm/Kconfig      | 13 +++++++++++++
 arch/arm/mm/proc-v7.S | 12 ++++++++++++
 2 files changed, 25 insertions(+)

-- 
1.9.1

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