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Re: [PATCH] ARM: fix alignement of __bug_table section entries

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Russell King - ARM Linux <linux@arm.linux.org.uk> writes:

>> Moreover, this is consistent with the fact that this commit is in linux-next but
>> not in v4.1 :
>>     a5e090acbf54 ("ARM: software-based priviledged-no-access support")
>> 
>> So the issue is around this SW_DOMAIN_PAN, at least on PXA.
>
> Is it only PXA which seems to be affected?
Sorry I don't know, I only own pxa platforms.

> If so, you may need to add:
>
> 	mrc p15, 0, \rd, c2, c0, 0
> 	mov \rd, \rd
> 	sub pc, pc, #4
>
> to the places we update the domain access register to ensure that the
> Xscale pipeline stalls to allow the CP15 DACR update to hit.
Okay, I'll try that.

By the way, the ARMv5 manual states in chapter "B4.5.1 MMU Fault" that for a
DACR update, a "PrefetchFlush" operation has to be done (chapter B2.6.3
PrefetchFlush CP15 register 7), quoting :
    Changes to the Domain Access Control register are synchronized by performing
    a PrefetchFlush operation (or as result of an exception or exception
    return). See Changes to CP15 registers and the memory order model on page
    B2-24 for details.

Cheers.

-- 
Robert
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[PATCH] ARM: fix alignement of __bug_table section entries Robert Jarzmik <robert.jarzmik@free.fr> - 2015-09-02 08:30 +0200
  Re: [PATCH] ARM: fix alignement of __bug_table section entries Dave Martin <Dave.Martin@arm.com> - 2015-09-02 12:50 +0200
    Re: [PATCH] ARM: fix alignement of __bug_table section entries Robert Jarzmik <robert.jarzmik@free.fr> - 2015-09-05 16:00 +0200
      Re: [PATCH] ARM: fix alignement of __bug_table section entries Russell King - ARM Linux <linux@arm.linux.org.uk> - 2015-09-05 16:30 +0200
        Re: [PATCH] ARM: fix alignement of __bug_table section entries Robert Jarzmik <robert.jarzmik@free.fr> - 2015-09-05 19:20 +0200
          Re: [PATCH] ARM: fix alignement of __bug_table section entries Russell King - ARM Linux <linux@arm.linux.org.uk> - 2015-09-05 22:40 +0200
            Re: [PATCH] ARM: fix alignement of __bug_table section entries Robert Jarzmik <robert.jarzmik@free.fr> - 2015-09-06 00:20 +0200
            Re: [PATCH] ARM: fix alignement of __bug_table section entries Robert Jarzmik <robert.jarzmik@free.fr> - 2015-09-06 19:40 +0200
              Re: [PATCH] ARM: fix alignement of __bug_table section entries Russell King - ARM Linux <linux@arm.linux.org.uk> - 2015-09-06 21:50 +0200
                Re: [PATCH] ARM: fix alignement of __bug_table section entries Robert Jarzmik <robert.jarzmik@free.fr> - 2015-09-06 23:40 +0200
                Re: [PATCH] ARM: fix alignement of __bug_table section entries Russell King - ARM Linux <linux@arm.linux.org.uk> - 2015-09-07 02:00 +0200
                Re: [PATCH] ARM: fix alignement of __bug_table section entries Robert Jarzmik <robert.jarzmik@free.fr> - 2015-09-08 19:10 +0200
                Re: [PATCH] ARM: fix alignement of __bug_table section entries Russell King - ARM Linux <linux@arm.linux.org.uk> - 2015-09-08 22:10 +0200
                Re: [PATCH] ARM: fix alignement of __bug_table section entries Robert Jarzmik <robert.jarzmik@free.fr> - 2015-09-08 23:00 +0200
                Re: [PATCH] ARM: fix alignement of __bug_table section entries Robert Jarzmik <robert.jarzmik@free.fr> - 2015-09-10 01:20 +0200
                Re: [PATCH] ARM: fix alignement of __bug_table section entries Robert Jarzmik <robert.jarzmik@free.fr> - 2015-09-10 21:10 +0200
                Re: [PATCH] ARM: fix alignement of __bug_table section entries Russell King - ARM Linux <linux@arm.linux.org.uk> - 2015-09-10 21:20 +0200
                Re: [PATCH] ARM: fix alignement of __bug_table section entries Robert Jarzmik <robert.jarzmik@free.fr> - 2015-09-10 23:00 +0200
                Re: [PATCH] ARM: fix alignement of __bug_table section entries Russell King - ARM Linux <linux@arm.linux.org.uk> - 2015-09-11 12:00 +0200
                [PATCH 2/2] ARM: domains: add memory dependencies to  get_domain/set_domain Russell King <rmk+kernel@arm.linux.org.uk> - 2015-09-11 12:00 +0200
                Re: [PATCH 2/2] ARM: domains: add memory dependencies to get_domain/set_domain Robert Jarzmik <robert.jarzmik@free.fr> - 2015-09-11 17:10 +0200
                Re: [PATCH 2/2] ARM: domains: add memory dependencies to  get_domain/set_domain Russell King - ARM Linux <linux@arm.linux.org.uk> - 2015-09-11 17:20 +0200
                Re: [PATCH 2/2] ARM: domains: add memory dependencies to get_domain/set_domain Robert Jarzmik <robert.jarzmik@free.fr> - 2015-09-11 17:50 +0200
                [PATCH 1/2] ARM: domains: thread_info.h no longer needs asm/domains.h Russell King <rmk+kernel@arm.linux.org.uk> - 2015-09-11 12:00 +0200

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