From: huang ying <huang.ying.caritas@gmail.com>
To: Andi Kleen <andi@firstfloor.org>
Cc: Huang Ying <ying.huang@intel.com>, Len Brown <lenb@kernel.org>,
linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org
Subject: Re: [PATCH 5/5] ACPI, APEI, Fix ERST MOVE_DATA instruction implementation
Date: Thu, 23 Sep 2010 17:04:31 +0800 [thread overview]
Message-ID: <AANLkTi=-LzZSgk9BYg8z6i5QrbRWPVBYtpqdkvsTc_E_@mail.gmail.com> (raw)
In-Reply-To: <20100921124718.GE18991@one.firstfloor.org>
Hi,
On Tue, Sep 21, 2010 at 8:47 PM, Andi Kleen <andi@firstfloor.org> wrote:
> On Sun, Sep 19, 2010 at 11:00:35AM +0800, Huang Ying wrote:
>> diff --git a/drivers/acpi/apei/erst.c b/drivers/acpi/apei/erst.c
>> index 40b01c3..a103963 100644
>> --- a/drivers/acpi/apei/erst.c
>> +++ b/drivers/acpi/apei/erst.c
>> @@ -266,13 +266,27 @@ static int erst_exec_move_data(struct apei_exec_context *ctx,
>> {
>> int rc;
>> u64 offset;
>> + void *src, *dst;
>> +
>> + /* ioremap does not work in interrupt context */
>> + if (in_interrupt())
>> + return -EBUSY;
>
> That breaks serialization of machine checks no? If the BIOS uses MOVE_DATA
> How about using kmap_atomic instead?
In my test machine, MOVE_DATA is not used. So this does not breaks
serialization of machine checks.
We can not use kmap_atomic or kmap_atomic_pfn here. Because
kmap_atomic_xxx needs struct page, but the address provided by BIOS
may be in E820_RESERVED area, that is, the corresponding page may have
no struct page. Maybe we need another kmap_atomic implementation for
E820_RESERVED area.
Best Regards,
Huang Ying
next prev parent reply other threads:[~2010-09-23 9:04 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-19 3:00 [PATCH 0/5] ACPI, APEI, BUG fixes for 2.6.36 Huang Ying
2010-09-19 3:00 ` [PATCH 1/5] ACPI, APEI, Fix APEI related table size checking Huang Ying
2010-09-21 12:39 ` Andi Kleen
2010-09-26 5:30 ` Huang Ying
2010-09-19 3:00 ` [PATCH 2/5] ACPI, APEI, Fix acpi_pre_map() return value Huang Ying
2010-09-21 12:47 ` Andi Kleen
2010-09-19 3:00 ` [PATCH 3/5] ACPI, APEI, HEST Fix the unsuitable usage of platform_data Huang Ying
2010-09-21 12:43 ` Andi Kleen
2010-09-22 1:05 ` Jin Dongming
2010-09-23 9:06 ` huang ying
2010-09-19 3:00 ` [PATCH 4/5] ACPI, APEI, Fix error path for memory allocation Huang Ying
2010-09-21 12:45 ` Andi Kleen
2010-09-23 8:53 ` huang ying
2010-09-19 3:00 ` [PATCH 5/5] ACPI, APEI, Fix ERST MOVE_DATA instruction implementation Huang Ying
2010-09-21 12:47 ` Andi Kleen
2010-09-23 9:04 ` huang ying [this message]
2010-09-27 5:31 ` Andi Kleen
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