linux-kernel - Re: [PATCH 23/30] microblaze_mmu_v1: Enable fork syscall for MMU and add fork as vfork for noMMU

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Message-ID: <49F82911.6060207@monstr.eu>
Date:	Wed, 29 Apr 2009 12:16:49 +0200
From:	Michal Simek <monstr@...str.eu>
To:	John Williams <john.williams@...alogix.com>
CC:	linux-kernel@...r.kernel.org, Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH 23/30] microblaze_mmu_v1: Enable fork syscall for MMU
 and add fork as vfork for noMMU

John Williams wrote:
> On Mon, Apr 27, 2009 at 6:32 PM,  <monstr@...str.eu> wrote:
>> From: Michal Simek <monstr@...str.eu>
>>
>> Signed-off-by: Michal Simek <monstr@...str.eu>
>> ---
>>  arch/microblaze/kernel/entry-nommu.S   |    3 ++-
>>  arch/microblaze/kernel/syscall_table.S |    2 +-
>>  2 files changed, 3 insertions(+), 2 deletions(-)
>>
>> diff --git a/arch/microblaze/kernel/entry-nommu.S b/arch/microblaze/kernel/entry-nommu.S
>> index f24b126..89f978a 100644
>> --- a/arch/microblaze/kernel/entry-nommu.S
>> +++ b/arch/microblaze/kernel/entry-nommu.S
>> @@ -10,7 +10,7 @@
>>
>>  #include <linux/linkage.h>
>>  #include <asm/thread_info.h>
>> -#include <asm/errno.h>
>> +#include <linux/errno.h>
>>  #include <asm/entry.h>
>>  #include <asm/asm-offsets.h>
>>  #include <asm/registers.h>
>> @@ -551,6 +551,7 @@ no_work_pending:
>>        rtid    r14, 0
>>        nop
>>
>> +sys_fork_wrapper:
>>  sys_vfork_wrapper:
>>        brid    sys_vfork
>>        addk    r5, r1, r0
> 
> NACK!  If only it was that easy :)
> 
> On noMMU we cannot just silently call vfork() if the application tries
> to fork() - you have to return -ENOSYS (or is there a better one?).
> This will just require a small sys_fork_wrapper in entry-nommu.S.

I will call for noMMU kernel ni_syscall which solve that problem.
(Arnd do it in his patches too)

Thanks,
Michal

> 
> John


-- 
Michal Simek, Ing. (M.Eng)
w: www.monstr.eu p: +42-0-721842854
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