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| author |   John David Anglin <dave.anglin@bell.net> | 2022-06-18 15:14:34 +0000 |
|---|---|---|
| committer |   Helge Deller <deller@gmx.de> | 2022-06-26 12:23:15 +0200 |
| commit | e9ed22e6e5010997a2f922eef61ca797d0a2a246 (patch) | |
| tree | 0d7e7676ffe3f53fc08a57dbf7950613946b9b0f /drivers | |
| parent | parisc: align '*' in comment in math-emu code (diff) | |
| download | wireguard-linux-e9ed22e6e5010997a2f922eef61ca797d0a2a246.tar.xz wireguard-linux-e9ed22e6e5010997a2f922eef61ca797d0a2a246.zip | |
parisc: Fix flush_anon_page on PA8800/PA8900
Anonymous pages are allocated with the shared mappings colouring,
SHM_COLOUR. Since the alias boundary on machines with PA8800 and
PA8900 processors is unknown, flush_user_cache_page() might not
flush all mappings of a shared anonymous page. Flushing the whole
data cache flushes all mappings.
This won't fix all coherency issues with shared mappings but it
seems to work well in practice. I haven't seen any random memory
faults in almost a month on a rp3440 running as a debian buildd
machine.
There is a small preformance hit.
Signed-off-by: John David Anglin <dave.anglin@bell.net>
Signed-off-by: Helge Deller <deller@gmx.de>
Cc: stable@vger.kernel.org # v5.18+
Diffstat (limited to 'drivers')
0 files changed, 0 insertions, 0 deletions