From: Guan Xuetao <gxt@mprc.pku.edu.cn>
To: Konstantin Khlebnikov <khlebnikov@openvz.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 08/16] mm/unicore32: use vm_flags_t for vma flags
Date: Tue, 27 Mar 2012 15:50:38 +0800 [thread overview]
Message-ID: <4F71714E.9080803@mprc.pku.edu.cn> (raw)
In-Reply-To: <4F71570D.4060507@openvz.org>
On 03/27/2012 01:58 PM, Konstantin Khlebnikov wrote:
> Guan Xuetao wrote:
>> On 03/21/2012 02:56 PM, Konstantin Khlebnikov wrote:
>>> The same magic like in arm: assembler code wants to test VM_EXEC,
>>> but for big-endian we should get upper word for this.
>>>
>>> Signed-off-by: Konstantin Khlebnikov<khlebnikov@openvz.org>
>>> Cc: Guan Xuetao<gxt@mprc.pku.edu.cn>
>>> ---
>>> arch/unicore32/kernel/asm-offsets.c | 6 +++++-
>>> arch/unicore32/mm/fault.c | 2 +-
>>> 2 files changed, 6 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/arch/unicore32/kernel/asm-offsets.c
>>> b/arch/unicore32/kernel/asm-offsets.c
>>> index ffcbe75..e3199b5 100644
>>> --- a/arch/unicore32/kernel/asm-offsets.c
>>> +++ b/arch/unicore32/kernel/asm-offsets.c
>>> @@ -87,9 +87,13 @@ int main(void)
>>> DEFINE(S_FRAME_SIZE, sizeof(struct pt_regs));
>>> BLANK();
>>> DEFINE(VMA_VM_MM, offsetof(struct vm_area_struct, vm_mm));
>>> +#if defined(CONFIG_CPU_BIG_ENDIAN)&& (NR_VMA_FLAGS> 32)
>>> + DEFINE(VMA_VM_FLAGS, offsetof(struct vm_area_struct,
>>> vm_flags) + 4);
>>> +#else
>> CONFIG_CPU_BIG/LITTLE_ENDIAN is defined only in some archs, and not
>> supported by unicore32.
>
> Ok, I'll drop this in v2
>
>>
>>> DEFINE(VMA_VM_FLAGS, offsetof(struct vm_area_struct,
>>> vm_flags));
>>> +#endif
>>> BLANK();
>>> - DEFINE(VM_EXEC, VM_EXEC);
>>> + DEFINE(VM_EXEC, (__force unsigned int)VM_EXEC);
>
>> Is this check useful for asm-offsets.h?
>
> this forced-typecast to make sparse happy, because we use here only
> (int) part of vma->vm_flags.
Perhaps, vm_flags_t, not unsigned int is more proper.
>
>>
>>> BLANK();
>>> DEFINE(PAGE_SZ, PAGE_SIZE);
>>> BLANK();
>>> diff --git a/arch/unicore32/mm/fault.c b/arch/unicore32/mm/fault.c
>>> index 283aa4b..9137996 100644
>>> --- a/arch/unicore32/mm/fault.c
>>> +++ b/arch/unicore32/mm/fault.c
>>> @@ -158,7 +158,7 @@ void do_bad_area(unsigned long addr, unsigned
>>> int fsr, struct pt_regs *regs)
>>> */
>>> static inline bool access_error(unsigned int fsr, struct
>>> vm_area_struct *vma)
>>> {
>>> - unsigned int mask = VM_READ | VM_WRITE | VM_EXEC;
>>> + vm_flags_t mask = VM_READ | VM_WRITE | VM_EXEC;
>>
>> I am confused for the type of vm_flags in vm_area_struct being
>> 'unsigned long', not vm_flags_t.
>
> Second patch in this patchset changes it.
> vm_flags_t will be unsigned long or or unsigned long long depending on
> vma flags count.
> But more likely it will be unsigned int, because I have another
> patchset in work,
> which currently drop four bits in vm_flags, so we can postpone its
> expansion.
I see. Thanks for your explanation.
Regards,
Guan Xuetao
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next prev parent reply other threads:[~2012-03-27 7:49 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-21 6:56 [PATCH 00/16] mm: prepare for converting vm->vm_flags to 64-bit Konstantin Khlebnikov
2012-03-21 6:56 ` [PATCH 01/16] mm: introduce NR_VMA_FLAGS Konstantin Khlebnikov
2012-03-21 6:56 ` [PATCH 02/16] mm: use vm_flags_t for vma flags Konstantin Khlebnikov
2012-03-21 6:56 ` [PATCH 03/16] mm/shmem: " Konstantin Khlebnikov
2012-03-21 6:56 ` [PATCH 04/16] mm/nommu: " Konstantin Khlebnikov
2012-03-21 7:08 ` Greg Ungerer
2012-03-21 7:20 ` Konstantin Khlebnikov
2012-03-21 12:01 ` [PATCH v2 " Konstantin Khlebnikov
2012-03-23 6:47 ` Greg Ungerer
2012-03-21 6:56 ` [PATCH 05/16] mm/drivers: " Konstantin Khlebnikov
2012-03-21 10:34 ` Laurent Pinchart
2012-03-21 14:46 ` Greg Kroah-Hartman
2012-03-21 6:56 ` [PATCH 06/16] mm/x86: " Konstantin Khlebnikov
2012-03-21 6:57 ` H. Peter Anvin
2012-03-21 6:56 ` [PATCH 07/16] mm/arm: " Konstantin Khlebnikov
2012-03-22 21:21 ` Andrew Morton
2012-03-21 6:56 ` [PATCH 08/16] mm/unicore32: " Konstantin Khlebnikov
2012-03-27 3:38 ` Guan Xuetao
2012-03-27 5:58 ` Konstantin Khlebnikov
2012-03-27 7:50 ` Guan Xuetao [this message]
2012-03-21 6:56 ` [PATCH 09/16] mm/ia64: " Konstantin Khlebnikov
2012-03-21 6:56 ` [PATCH 10/16] mm/powerpc: " Konstantin Khlebnikov
2012-03-21 6:56 ` [PATCH 11/16] mm/s390: " Konstantin Khlebnikov
2012-03-21 6:57 ` [PATCH 12/16] mm/mips: " Konstantin Khlebnikov
2012-03-21 6:57 ` [PATCH 13/16] mm/parisc: " Konstantin Khlebnikov
2012-03-21 6:57 ` [PATCH 14/16] mm/score: " Konstantin Khlebnikov
2012-03-21 6:57 ` [PATCH 15/16] mm: cast vm_flags_t to u64 before printing Konstantin Khlebnikov
2012-03-21 6:57 ` [PATCH 16/16] mm: vm_flags_t strict type checking Konstantin Khlebnikov
2012-03-21 12:11 ` [PATCH v2 " Konstantin Khlebnikov
2012-03-21 10:06 ` [PATCH 00/16] mm: prepare for converting vm->vm_flags to 64-bit Minchan Kim
2012-03-21 13:16 ` Konstantin Khlebnikov
2012-03-22 5:39 ` Minchan Kim
2012-03-22 6:22 ` Benjamin Herrenschmidt
2012-03-24 14:46 ` Konstantin Khlebnikov
2012-03-24 15:00 ` Konstantin Khlebnikov
2012-03-24 23:50 ` Benjamin Herrenschmidt
2012-03-25 7:55 ` Konstantin Khlebnikov
2012-03-22 21:26 ` Andrew Morton
2012-03-22 21:28 ` Al Viro
2012-03-22 21:41 ` Andrew Morton
2012-03-22 21:57 ` Al Viro
2012-03-22 22:05 ` Konstantin Khlebnikov
2012-03-22 22:24 ` Konstantin Khlebnikov
2012-03-22 22:39 ` Linus Torvalds
2012-03-22 22:52 ` Konstantin Khlebnikov
2012-03-22 23:09 ` Andrew Morton
2012-03-23 1:42 ` Al Viro
2012-03-22 22:08 ` Linus Torvalds
2012-03-23 16:19 ` KOSAKI Motohiro
2012-03-30 2:19 ` Al Viro
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