On 05/04/2018 06:12 PM, Ram Pai wrote:
>> That new line boils down to:
>>
>> [ilog2(0)] = "",
>>
>> on x86. It wasn't *obvious* to me that it is OK to do that. The other
>> possibly undefined bits (VM_SOFTDIRTY for instance) #ifdef themselves
>> out of this array.
>>
>> I would
On Fri, May 04, 2018 at 03:57:33PM -0700, Dave Hansen wrote:
> > diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
> > index 0c9e392..3c7 100644
> > --- a/fs/proc/task_mmu.c
> > +++ b/fs/proc/task_mmu.c
> > @@ -679,6 +679,7 @@ static void show_smap_vma_flags(struct seq_file *m,
> > struct v
> diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
> index 0c9e392..3c7 100644
> --- a/fs/proc/task_mmu.c
> +++ b/fs/proc/task_mmu.c
> @@ -679,6 +679,7 @@ static void show_smap_vma_flags(struct seq_file *m,
> struct vm_area_struct *vma)
> [ilog2(VM_PKEY_BIT1)] = "",
>
Only 4bits are allocated in the vma flags to hold 16 keys. This is
sufficient on x86. PowerPC supports 32 keys, which needs 5bits.
Allocate an additional bit.
cc: Dave Hansen
cc: Michael Ellermen
cc: Benjamin Herrenschmidt
cc: Andrew Morton
Reviewed-by: Ingo Molnar
Acked-by: Balbir Singh
Si
