Commit 359db57c authored Apr 29, 2019 by Vincenzo Frascino Committed by Will Deacon Apr 30, 2019

arm64: compat: Reduce address limit for 64K pages



With the introduction of the config option that allows to enable kuser
helpers, it is now possible to reduce TASK_SIZE_32 when these are
disabled and 64K pages are enabled. This extends the compliance with
the section 6.5.8 of the C standard (C99).

Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Reported-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

parent 75a19a02

arch/arm64/include/asm/processor.h

+1 −1

Original line number	Diff line number	Diff line
		@@ -57,7 +57,7 @@
		#define TASK_SIZE_64 (UL(1) << vabits_user)

		#ifdef CONFIG_COMPAT
		#ifdef CONFIG_ARM64_64K_PAGES
		#if defined(CONFIG_ARM64_64K_PAGES) && defined(CONFIG_KUSER_HELPERS)
		/*
		* With CONFIG_ARM64_64K_PAGES enabled, the last page is occupied
		* by the compat vectors page.

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