Messages in this thread | | | Date | Wed, 28 Jun 2023 07:30:16 +0200 | From | Greg KH <> | Subject | Re: [PATCH] pstore: ramoops: support pmsg size larger than kmalloc limitation |
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On Tue, Jun 27, 2023 at 01:25:41PM -0700, Yuxiao Zhang wrote: > Current pmsg implementation is using kmalloc for pmsg record buffer, > which has max size limits based on page size.
What is that max size?
> Currently even we > allocate enough space with pmsg-size, pmsg will still fail if the > file size is larger than what kmalloc allowed. > > Since we don't need physical contiguous memory for pmsg buffer > , we can use kvmalloc to avoid such limitation.
Odd placement of the ',' character :)
Anyway, thanks for getting this sent out.
But, what in-kernel user is hitting this in the pstore implementation? How big of a buffer is it trying to create? Is this a bug in older kernels with the in-kernel drivers as well? If so, should it go to stable releases and how far back?
thanks,
greg k-h
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