Re: linux-next: build failure after merge of the kvm tree

[Paolo Bonzini <pbonzini@redhat.com>]

On Fri, Apr 12, 2024 at 5:35 AM Stephen Rothwell <sfr@canb.auug.org.au> wrote:
> On Fri, 12 Apr 2024 13:34:07 +1000 Stephen Rothwell <sfr@canb.auug.org.au> wrote:
> >
> > After merging the kvm tree, today's linux-next build (arm
> > multi_v7_defconfig) failed like this:
> >
> > kernel/events/uprobes.c: In function '__replace_page':
> > kernel/events/uprobes.c:160:35: error: storage size of 'range' isn't known
> >   160 |         struct mmu_notifier_range range;
> >       |                                   ^~~~~
> > kernel/events/uprobes.c:162:9: error: implicit declaration of function 'mmu_notifier_range_init' [-Werror=implicit-function-declaration]
> >   162 |         mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, mm, addr,
> >       |         ^~~~~~~~~~~~~~~~~~~~~~~
> > kernel/events/uprobes.c:162:41: error: 'MMU_NOTIFY_CLEAR' undeclared (first use in this function)
> >   162 |         mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, mm, addr,
> >       |                                         ^~~~~~~~~~~~~~~~
> > kernel/events/uprobes.c:162:41: note: each undeclared identifier is reported only once for each function it appears in
> > kernel/events/uprobes.c:175:9: error: implicit declaration of function 'mmu_notifier_invalidate_range_start' [-Werror=implicit-function-declaration]
> >   175 |         mmu_notifier_invalidate_range_start(&range);
> >       |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > kernel/events/uprobes.c:208:9: error: implicit declaration of function 'mmu_notifier_invalidate_range_end' [-Werror=implicit-function-declaration]
> >   208 |         mmu_notifier_invalidate_range_end(&range);
> >       |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > kernel/events/uprobes.c:160:35: warning: unused variable 'range' [-Wunused-variable]
> >   160 |         struct mmu_notifier_range range;
> >       |                                   ^~~~~
> > cc1: some warnings being treated as errors
> >
> > Caused by commit
> >
> >   b06d4c260e93 ("mm: replace set_pte_at_notify() with just set_pte_at()")
> >
> > I have applied the following patial revert for today.
>
> From: Stephen Rothwell <sfr@canb.auug.org.au>
> Date: Fri, 12 Apr 2024 13:27:20 +1000
> Subject: [PATCH] fix up for "mm: replace set_pte_at_notify() with just
>  set_pte_at()"
>
> Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
> ---
>  kernel/events/uprobes.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
> index f4523b95c945..1215bc299390 100644
> --- a/kernel/events/uprobes.c
> +++ b/kernel/events/uprobes.c
> @@ -18,6 +18,7 @@
>  #include <linux/sched/coredump.h>
>  #include <linux/export.h>
>  #include <linux/rmap.h>                /* anon_vma_prepare */
> +#include <linux/mmu_notifier.h>
>  #include <linux/swap.h>                /* folio_free_swap */
>  #include <linux/ptrace.h>      /* user_enable_single_step */
>  #include <linux/kdebug.h>      /* notifier mechanism */
> --
> 2.43.0

Fixed, thanks and sorry for messing up.

Paolo