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| author | Steve Capper <[email protected]> | 2016-06-07 16:58:06 +0000 |
|---|---|---|
| committer | Russell King <[email protected]> | 2016-06-09 16:51:47 +0000 |
| commit | 56530f5d2ddc9b9fade7ef8db9cb886e9dc689b5 (patch) | |
| tree | f9386825ee9feadc54787360aafb744d78bc9ed5 /drivers/acpi/cppc_acpi.c | |
| parent | ARM: 8578/1: mm: ensure pmd_present only checks the valid bit (diff) | |
| download | kernel-56530f5d2ddc9b9fade7ef8db9cb886e9dc689b5.tar.gz kernel-56530f5d2ddc9b9fade7ef8db9cb886e9dc689b5.zip | |
ARM: 8579/1: mm: Fix definition of pmd_mknotpresent
Currently pmd_mknotpresent will use a zero entry to respresent an
invalidated pmd.
Unfortunately this definition clashes with pmd_none, thus it is
possible for a race condition to occur if zap_pmd_range sees pmd_none
whilst __split_huge_pmd_locked is running too with pmdp_invalidate
just called.
This patch fixes the race condition by modifying pmd_mknotpresent to
create non-zero faulting entries (as is done in other architectures),
removing the ambiguity with pmd_none.
[[email protected]: using L_PMD_SECT_VALID instead of PMD_TYPE_SECT]
Fixes: 8d9625070073 ("ARM: mm: Transparent huge page support for LPAE systems.")
Cc: <[email protected]> # 3.11+
Reported-by: Kirill A. Shutemov <[email protected]>
Acked-by: Will Deacon <[email protected]>
Cc: Russell King <[email protected]>
Signed-off-by: Steve Capper <[email protected]>
Signed-off-by: Catalin Marinas <[email protected]>
Signed-off-by: Russell King <[email protected]>
Diffstat (limited to 'drivers/acpi/cppc_acpi.c')
0 files changed, 0 insertions, 0 deletions