parisc: Protect huge page pte changes with spinlocks

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commit b0e551313e upstream.

PA-RISC doesn't have atomic instructions to modify page table entries, so it
takes spinlock in the TLB handler and modifies the page table entry
non-atomically. If you modify the page table entry without the spinlock, you
may race with TLB handler on another CPU and your modification may be lost.
Protect against that with usage of purge_tlb_start() and purge_tlb_end() which
handles the TLB spinlock.

Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Helge Deller 2015-11-26 21:14:02 +01:00 • committed by Greg Kroah-Hartman

parent a623f87a72

commit 583097a3b2

2 changed files with 52 additions and 28 deletions

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20

arch/parisc/include/asm/hugetlb.h

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60

arch/parisc/mm/hugetlbpage.c

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