Hello Sadanand On January 2, 2021 3:39:08 PM GMT+03:00, Sadanand Warrier <sadanandwarrier@xxxxxxxxx> wrote: >Folks > Since Linux uses lazy evaluation with respect to allocating memory >what happens if a user process allocates memory using malloc in excess >of say 8 or nine pages and calls a device ioctl and passes the user >space pointer to it to be used to pin pages using get_user_pages(). I don't have an answer to your question because your sentences are too long and I couldn't understand the thing you are asking. >This buffer is to be used for a dma read from a device. >What happens if the memory isn't actually allocated (no initialization >with memset or calloc etc. and all PTEs are pointing to some zero >filled page) and there is no IOMMU? >Thanks > >S Please use punctuation marks as termination points and keep your sentences shorter for better responses from any community. Thank you _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
