Re: [PATCH v4 bpf-next 1/2] mm: Enforce VM_IOREMAP flag and range in ioremap_page_range.

[Alexei Starovoitov <alexei.starovoitov@xxxxxxxxx>]

On Fri, Mar 8, 2024 at 9:14 AM Marek Szyprowski
<m.szyprowski@xxxxxxxxxxx> wrote:
>
> On 05.03.2024 04:05, Alexei Starovoitov wrote:
> > From: Alexei Starovoitov <ast@xxxxxxxxxx>
> >
> > There are various users of get_vm_area() + ioremap_page_range() APIs.
> > Enforce that get_vm_area() was requested as VM_IOREMAP type and range
> > passed to ioremap_page_range() matches created vm_area to avoid
> > accidentally ioremap-ing into wrong address range.
> >
> > Reviewed-by: Christoph Hellwig <hch@xxxxxx>
> > Signed-off-by: Alexei Starovoitov <ast@xxxxxxxxxx>
> > ---
>
> This patch landed in today's linux-next as commit 3e49a866c9dc ("mm:
> Enforce VM_IOREMAP flag and range in ioremap_page_range.").
> Unfortunately it triggers the following warning on all my test machines
> with PCI bridges. Here is an example reproduced with QEMU and ARM64
> 'virt' machine:

Sorry about the breakage.
Here is the thread where we're discussing the fix:
https://lore.kernel.org/bpf/CAADnVQLP=dxBb+RiMGXoaCEuRrbK387J6B+pfzWKF_F=aRgCPQ@xxxxxxxxxxxxxx/