According to [1] the GFP_DMA (and might be __GFP_DMA32, though it's not explicitly listed, however dell-smbios.c is listed there) has some memory allocator performance impact and in 99.99% shows a buggy / old hw / code. So, in PDx86 we have two files $ git grep -n GFP_DMA -- drivers/platform/x86/ drivers/platform/x86/asus-wmi.c:343: input.pointer = kzalloc(args.length, GFP_DMA | GFP_KERNEL); drivers/platform/x86/dell-smbios-smm.c:138: buffer = (void *)__get_free_page(GFP_KERNEL | GFP_DMA32); Looking to the ASuS related code I would conclude that the guy who submitted a patch didn't investigate it properly and root cause left unknown. So, would be nice to have someone with actual bug reproducer to find a better solution. Dell case, since we have an active maintainer, can be clarified by contributors and Dell representative here. Any (additional) thoughts with regard to the topic? [1]: https://lwn.net/Articles/753274/ -- With Best Regards, Andy Shevchenko
