linux-kernel - Re: [PATCH 04/16] mm/nommu: use vm_flags

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Message-ID: <4F698134.9010104@openvz.org>
Date:	Wed, 21 Mar 2012 11:20:20 +0400
From:	Konstantin Khlebnikov <khlebnikov@...nvz.org>
To:	Greg Ungerer <gerg@...pgear.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	David Howells <dhowells@...hat.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Greg Ungerer <gerg@...inux.org>
Subject: Re: [PATCH 04/16] mm/nommu: use vm_flags_t for vma flags

Greg Ungerer wrote:
>
> Hi Konstantin,
>
> On 21/03/12 16:56, Konstantin Khlebnikov wrote:
>> Signed-off-by: Konstantin Khlebnikov<khlebnikov@...nvz.org>
>> Cc: David Howells<dhowells@...hat.com>
>> Cc: Greg Ungerer<gerg@...inux.org>
>> ---
>>    fs/proc/nommu.c      |    3 ++-
>>    fs/proc/task_nommu.c |   14 ++++++++------
>>    mm/nommu.c           |   19 ++++++++++---------
>>    3 files changed, 20 insertions(+), 16 deletions(-)
>>
>> diff --git a/fs/proc/nommu.c b/fs/proc/nommu.c
>> index b1822dd..cadc798 100644
>> --- a/fs/proc/nommu.c
>> +++ b/fs/proc/nommu.c
>> @@ -39,7 +39,8 @@ static int nommu_region_show(struct seq_file *m, struct vm_region *region)
>>    	unsigned long ino = 0;
>>    	struct file *file;
>>    	dev_t dev = 0;
>> -	int flags, len;
>> +	int len;
>> +	vm_flags_t vm_flags;
>>
>>    	flags = region->vm_flags;
>           ^^^^^
> I think you want vm_flags here right?
> There is other uses of "flags" in this function as well.

Right, I missed this.

Sorry for my cheating, I didn't check compiling for all possible targets =)

>
> Regards
> Greg
>
>
>>    	file = region->vm_file;
>> diff --git a/fs/proc/task_nommu.c b/fs/proc/task_nommu.c
>> index 8aaba8c..9abbc66 100644
>> --- a/fs/proc/task_nommu.c
>> +++ b/fs/proc/task_nommu.c
>> @@ -142,10 +142,11 @@ static int nommu_vma_show(struct seq_file *m, struct vm_area_struct *vma,
>>    	unsigned long ino = 0;
>>    	struct file *file;
>>    	dev_t dev = 0;
>> -	int flags, len;
>> +	int len;
>> +	vm_flags_t vm_flags;
>>    	unsigned long long pgoff = 0;
>>
>> -	flags = vma->vm_flags;
>> +	vm_flags = vma->vm_flags;
>>    	file = vma->vm_file;
>>
>>    	if (file) {
>> @@ -159,10 +160,11 @@ static int nommu_vma_show(struct seq_file *m, struct vm_area_struct *vma,
>>    		   "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu %n",
>>    		   vma->vm_start,
>>    		   vma->vm_end,
>> -		   flags&   VM_READ ? 'r' : '-',
>> -		   flags&   VM_WRITE ? 'w' : '-',
>> -		   flags&   VM_EXEC ? 'x' : '-',
>> -		   flags&   VM_MAYSHARE ? flags&   VM_SHARED ? 'S' : 's' : 'p',
>> +		   vm_flags&   VM_READ ? 'r' : '-',
>> +		   vm_flags&   VM_WRITE ? 'w' : '-',
>> +		   vm_flags&   VM_EXEC ? 'x' : '-',
>> +		   vm_flags&   VM_MAYSHARE ?
>> +			vm_flags&   VM_SHARED ? 'S' : 's' : 'p',
>>    		   pgoff,
>>    		   MAJOR(dev), MINOR(dev), ino,&len);
>>
>> diff --git a/mm/nommu.c b/mm/nommu.c
>> index f59e170..33d0ab7 100644
>> --- a/mm/nommu.c
>> +++ b/mm/nommu.c
>> @@ -130,7 +130,7 @@ int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
>>    		     int *retry)
>>    {
>>    	struct vm_area_struct *vma;
>> -	unsigned long vm_flags;
>> +	vm_flags_t vm_flags;
>>    	int i;
>>
>>    	/* calculate required read or write permissions.
>> @@ -658,13 +658,13 @@ static void put_nommu_region(struct vm_region *region)
>>    /*
>>     * update protection on a vma
>>     */
>> -static void protect_vma(struct vm_area_struct *vma, unsigned long flags)
>> +static void protect_vma(struct vm_area_struct *vma, vm_flags_t vm_flags)
>>    {
>>    #ifdef CONFIG_MPU
>>    	struct mm_struct *mm = vma->vm_mm;
>>    	long start = vma->vm_start&   PAGE_MASK;
>>    	while (start<   vma->vm_end) {
>> -		protect_page(mm, start, flags);
>> +		protect_page(mm, start, vm_flags);
>>    		start += PAGE_SIZE;
>>    	}
>>    	update_protections(mm);
>> @@ -1060,12 +1060,12 @@ static int validate_mmap_request(struct file *file,
>>     * we've determined that we can make the mapping, now translate what we
>>     * now know into VMA flags
>>     */
>> -static unsigned long determine_vm_flags(struct file *file,
>> -					unsigned long prot,
>> -					unsigned long flags,
>> -					unsigned long capabilities)
>> +static vm_flags_t determine_vm_flags(struct file *file,
>> +				     unsigned long prot,
>> +				     unsigned long flags,
>> +				     unsigned long capabilities)
>>    {
>> -	unsigned long vm_flags;
>> +	vm_flags_t vm_flags;
>>
>>    	vm_flags = calc_vm_prot_bits(prot) | calc_vm_flag_bits(flags);
>>    	/* vm_flags |= mm->def_flags; */
>> @@ -1243,7 +1243,8 @@ unsigned long do_mmap_pgoff(struct file *file,
>>    	struct vm_area_struct *vma;
>>    	struct vm_region *region;
>>    	struct rb_node *rb;
>> -	unsigned long capabilities, vm_flags, result;
>> +	unsigned long capabilities, result;
>> +	vm_flags_t vm_flags;
>>    	int ret;
>>
>>    	kenter(",%lx,%lx,%lx,%lx,%lx", addr, len, prot, flags, pgoff);
>>
>>
>>
>>
>
>

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