ACK/Cmnt: [PATCH 0/4][SRU][B-HWE][D][V3] fix i386 boot crashes, LP: #1838115

[Stefan Bader]

On 29.07.19 13:19, Colin King wrote:
> From: Colin Ian King <colin.king at canonical.com>
> 
> BugLink: https://bugs.launchpad.net/bugs/1838115
> 
> Fix i386 boot crashes and i915 graphics corruption. Upstream fix
> 3f8fd02b1bf1d7b (" mm/vmalloc: Sync unmappings in 
> __purge_vmap_area_lazy()") fixes the core issue, and pull in 3
> other prerequesits to allow patch to apply cleanly w/o any
> backporting.
> 
> Tested on Ubuntu Bionic i386 and amd64 with some stress-testing
> with stress-ng --vm 4 --brk 1 for 5 minutes.
> 
> Joerg Roedel (3):
>   x86/mm: Check for pfn instead of page in vmalloc_sync_one()
>   x86/mm: Sync also unmappings in vmalloc_sync_all()
>   mm/vmalloc: Sync unmappings in __purge_vmap_area_lazy()
> 
> Uladzislau Rezki (Sony) (1):
>   mm/vmalloc.c: add priority threshold to __purge_vmap_area_lazy()
> 
>  arch/x86/mm/fault.c | 15 ++++++---------
>  mm/vmalloc.c        | 27 +++++++++++++++++++++------
>  2 files changed, 27 insertions(+), 15 deletions(-)
> 
I guess that additional pick is not directly related but a little bit feels like
it could help to make kernels survive stress testing somewhat better.
All looking ok to me.

Acked-by: Stefan Bader <stefan.bader at canonical.com>

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