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SubjectRe: [PATCH] swiotlb: suppress warning when __GFP_NOWARN is set.
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Am 19.12.2017 um 15:52 schrieb Konrad Rzeszutek Wilk:
> On December 19, 2017 9:32:55 AM EST, "Christian König" <ckoenig.leichtzumerken@gmail.com> wrote:
>> TTM tries to allocate coherent memory in chunks of 2MB first to improve
>> TLB efficiency and falls back to allocating 4K pages if that fails.
>>
>> Suppress the warning when the 2MB allocations fails since there is a
>> valid fall back path.
>>
>> Signed-off-by: Christian König <christian.koenig@amd.com>
> Is there an Reported by or such needed?

Sorry my fault not to include that.

Reported-by: Mike Galbraith <efault@gmx.de>.

>> ---
>> lib/swiotlb.c | 8 +++++---
>> 1 file changed, 5 insertions(+), 3 deletions(-)
>>
>> diff --git a/lib/swiotlb.c b/lib/swiotlb.c
>> index cea19aaf303c..63a44fb29ce6 100644
>> --- a/lib/swiotlb.c
>> +++ b/lib/swiotlb.c
>> @@ -769,9 +769,11 @@ swiotlb_alloc_coherent(struct device *hwdev,
>> size_t size,
>> return ret;
>>
>> err_warn:
>> - pr_warn("swiotlb: coherent allocation failed for device %s
>> size=%zu\n",
>> - dev_name(hwdev), size);
>> - dump_stack();
>> + if (!(flags & __GFP_NOWARN)) {
>> + pr_warn("swiotlb: coherent allocation failed for device %s
>> size=%zu\n",
>> + dev_name(hwdev), size);
>> + dump_stack();
>> + }
> Ok, let me queue it up.

Thanks,
Christian.

>> return NULL;
>> }

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