linux

Steve Capper 9919761a5d ARM: 8579/1: mm: Fix definition of pmd_mknotpresent commit `56530f5d2d` upstream. 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. [catalin.marinas@arm.com: using L_PMD_SECT_VALID instead of PMD_TYPE_SECT] Fixes: `8d96250700` ("ARM: mm: Transparent huge page support for LPAE systems.") Reported-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Acked-by: Will Deacon <will.deacon@arm.com> Cc: Russell King <linux@armlinux.org.uk> Signed-off-by: Steve Capper <steve.capper@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> [bwh: Backported to 3.16: also convert from a macro to a function, as done earlier upstream] Signed-off-by: Ben Hutchings <ben@decadent.org.uk>		History 2016-08-22 22:38:14 +01:00
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asm	ARM: 8579/1: mm: Fix definition of pmd_mknotpresent	2016-08-22 22:38:14 +01:00
debug	Samsung Exynos updates for 3.16	2014-05-30 21:44:49 -07:00
uapi/asm	ARM: 8097/1: unistd.h: relocate comments back to place	2014-09-05 16:36:28 -07:00