On 11/14/2013 05:18 PM, James Hogan wrote:
> On Thursday 14 November 2013 16:11:21 Chen Gang wrote:
>> Like another p?d_alloc(), pud_alloc() also may fail, so need check it.
>>
>> Signed-off-by: Chen Gang <[email protected]>
>
> NAK.
>
> pud_alloc folds to pud_offset on Meta so it cannot fail.
>
If so, can pmd_alloc() be fail?
I checked the related definitions, it seems a little complex, can we
assume p?d_alloc() are in the same condition?
Thanks.
> Cheers
> James
>
>> ---
>> arch/metag/kernel/dma.c | 5 +++++
>> 1 files changed, 5 insertions(+), 0 deletions(-)
>>
>> diff --git a/arch/metag/kernel/dma.c b/arch/metag/kernel/dma.c
>> index db589ad..e6cf39b 100644
>> --- a/arch/metag/kernel/dma.c
>> +++ b/arch/metag/kernel/dma.c
>> @@ -398,6 +398,11 @@ static int __init dma_alloc_init(void)
>> int offset = pgd_index(CONSISTENT_START);
>> pgd = pgd_offset(&init_mm, CONSISTENT_START);
>> pud = pud_alloc(&init_mm, pgd, CONSISTENT_START);
>> + if (!pud) {
>> + pr_err("%s: no pud tables\n", __func__);
>> + ret = -ENOMEM;
>> + break;
>> + }
>> pmd = pmd_alloc(&init_mm, pud, CONSISTENT_START);
>> if (!pmd) {
>> pr_err("%s: no pmd tables\n", __func__);
>
>
--
Chen Gang
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