linux/arch/arm64/mm
Christoffer Dall fd28f5d439 arm64: Don't report clear pmds and puds as huge
The current pmd_huge() and pud_huge() functions simply check if the table
bit is not set and reports the entries as huge in that case.  This is
counter-intuitive as a clear pmd/pud cannot also be a huge pmd/pud, and
it is inconsistent with at least arm and x86.

To prevent others from making the same mistake as me in looking at code
that calls these functions and to fix an issue with KVM on arm64 that
causes memory corruption due to incorrect page reference counting
resulting from this mistake, let's change the behavior.

Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Reviewed-by: Steve Capper <steve.capper@linaro.org>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Fixes: 084bd29810 ("ARM64: mm: HugeTLB support.")
Cc: <stable@vger.kernel.org> # 3.11+
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2015-07-01 14:29:28 +01:00
..
cache.S arm64: alternative: Merge alternative-asm.h into alternative.h 2015-06-05 10:38:53 +01:00
context.c arm64: Do not attempt to use init_mm in reset_context() 2015-06-12 15:36:18 +01:00
copypage.c arm64: export __cpu_{clear,copy}_user_page functions 2014-07-08 17:30:51 +01:00
dma-mapping.c arm64: add missing PAGE_ALIGN() to __dma_free() 2015-04-29 17:39:39 +01:00
dump.c arm64: mm: Fix build error with CONFIG_SPARSEMEM_VMEMMAP disabled 2015-05-05 12:22:17 +01:00
extable.c arm64: MMU fault handling and page table management 2012-09-17 13:41:57 +01:00
fault.c arm64: use private ratelimit state along with show_unhandled_signals 2015-06-19 16:26:15 +01:00
flush.c arm64: kill flush_cache_all() 2015-05-19 15:27:42 +01:00
hugetlbpage.c arm64: Don't report clear pmds and puds as huge 2015-07-01 14:29:28 +01:00
init.c arm64: mm: Fix freeing of the wrong memmap entries with !SPARSEMEM_VMEMMAP 2015-06-17 14:29:34 +01:00
ioremap.c arm64: add ioremap physical address information 2015-01-23 15:29:06 +00:00
Makefile arm64: use fixmap region for permanent FDT mapping 2015-06-02 16:31:33 +01:00
mm.h arm64: add better page protections to arm64 2015-01-22 14:54:29 +00:00
mmap.c mm: expose arch_mmap_rnd when available 2015-04-14 16:49:05 -07:00
mmu.c arm64: fix incorrect use of pgprot_t variable 2015-06-30 18:03:37 +01:00
pageattr.c arm64: mm: unexport set_memory_ro and set_memory_rw 2015-03-19 10:43:56 +00:00
pgd.c arm64: pgalloc: consistently use PGALLOC_GFP 2014-11-20 12:05:18 +00:00
proc-macros.S arm64: mm: increase VA range of identity map 2015-03-23 11:35:29 +00:00
proc.S arm64: kill flush_cache_all() 2015-05-19 15:27:42 +01:00