On Tue, May 05, 2020 at 01:42:12PM +0200, Jann Horn wrote: > On Tue, May 5, 2020 at 12:48 PM Christoph Hellwig <hch@xxxxxx> wrote: > > On Wed, Apr 29, 2020 at 11:49:50PM +0200, Jann Horn wrote: > > > dump_emit() is for kernel pointers, and VMAs describe userspace memory. > > > Let's be tidy here and avoid accessing userspace pointers under KERNEL_DS, > > > even if it probably doesn't matter much on !MMU systems - especially given > > > that it looks like we can just use the same get_dump_page() as on MMU if > > > we move it out of the CONFIG_MMU block. > > > > Looks sensible. Did you get a chance to test this with a nommu setup? > > Nope. Do you happen to have a recommendation for a convenient > environment I can use with QEMU, or something like that? I'm guessing > that just running a standard armel Debian userspace with a !mmu ARM > kernel wouldn't work so well? Nommu generally needs special userspace either using uclibc-ng or musl. When I did the RISC-V nommu work I used buildroot for my root file systems. We haven't gotten elffdpic to work on RISC-V yet, so I can't use that setup for testing, but it should support ARM as well.
