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authorJohn David Anglin <dave.anglin@bell.net>2016-12-06 21:47:04 -0500
committerHelge Deller <deller@gmx.de>2016-12-07 08:56:40 +0100
commitc78e710c1c9fbeff43dddc0aa3d0ff458e70b0cc (patch)
tree981210b6bafc21ba73f0ea3b2f5ac00f8b60a6b9 /Documentation
parentbc3913a5378cd0ddefd1dfec6917cc12eb23a946 (diff)
parisc: Purge TLB before setting PTE
The attached change interchanges the order of purging the TLB and setting the corresponding page table entry. TLB purges are strongly ordered. It occurred to me one night that setting the PTE first might have subtle ordering issues on SMP machines and cause random memory corruption. A TLB lock guards the insertion of user TLB entries. So after the TLB is purged, a new entry can't be inserted until the lock is released. This ensures that the new PTE value is used when the lock is released. Since making this change, no random segmentation faults have been observed on the Debian hppa buildd servers. Signed-off-by: John David Anglin <dave.anglin@bell.net> Cc: <stable@vger.kernel.org> # v3.16+ Signed-off-by: Helge Deller <deller@gmx.de>
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