Re: ib-rhashtable.c:90:17: error

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I had encountered same problem. And i solved by some procedures below:

Step 1: linux-next check out to latest version, backports also
checkout to master and apply ccm patch.
Step 2: generate tree by ./ --verbose --clean ~/linux-next/
Step 3: modify DECLARE_EWMA(signal, 10, 8) to DECLARE_EWMA(signal,
2014, 8) in ../mac80211/sta_info.h of backports-output
Step 4: modify "skb=idr_remove(...);" to "skb=idr_find(...); if (skb)
idr_remove(...);"  in ../mac80211/status.h of backports-output
Step 5: Target linux kernel (the lower version or your specific
version ) need to be compiled first.
Step 6: export KLIB_BUILD="path/to/your_lower_linux_kernel"
Step 7: export KLIB="path/to/your/build/object" (I am about to get
*.ko, thus i point the directory to backports-output)
Step 8: make defconfig-your_choice (I am using defconfig-ath10k)
Step 9: make the backports-output and wait to compile.

My compile environment is Ubuntu16.04 with kernel 4.4 and I am porting
ath10k in linux kernel 4.11 back to linux 4.2.
I hope this information will help you.

On Wed, Mar 29, 2017 at 4:19 PM, Johannes Berg
<johannes@xxxxxxxxxxxxxxxx> wrote:
>>     tbl->locks = kvmalloc(size * sizeof(spinlock_t), gfp);
> Looks like we need to backport kvmalloc(), and perhaps something around
> the free as well.
>> Is there any fix for that?
> No, not yet, but shouldn't be hard.
> johannes
> --
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吳重毅 Wu Chung-yi
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