Re: [PATCH 0/2] sparc64: D-cache alias flushing fixes

[Imre Kaloz]

Hi Adrian,

On Sun, 27 Sep 2026, John Paul Adrian Glaubitz wrote:

> On Sun, 2026-09-27 at 12:55 +0200, Imre Kaloz wrote:
> > Two fixes to D-cache alias flushing on sparc64 CPUs with a virtually
> > indexed L1 D-cache.
> >
> > Patch 1 makes move_pte() and tlb_batch_add() flush only the page a PTE
> > maps, instead of every page of its folio once per PTE, so the number
> > of cross-calls for an mremap() of a large folio no longer grows with
> > the square of its size.
> >
> > Patch 2 implements flush_cache_vmap() and flush_cache_vunmap(), which
> > have been no-ops on sparc64.  Stale lines left by a vmalloc mapping
> > corrupt BPF programs and module data on UltraSPARC III.  It uses
> > flush_dcache_page_all() as patch 1 restores it.
> >
> > Both patches are tagged for stable.  Tested on a Sun Ultra 45.

<snip>

> Would you mind reporting the bugs that these patches fix in the sparclinux
> issue tracker on GitHub [1]? The reason I'm asking is that there has been
> recently a strong uptick of patches for SPARC and I want to make sure we're
> not missing any when Andreas gets back to reviewing patches.

Was going to do that. For two days my U45 seems finally rock solid after 
many years.


Best,
Imre