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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>
This commit is contained in:
Vincenzo Frascino 2019-04-29 18:27:13 +01:00 committed by Will Deacon
parent 75a19a0202
commit 359db57c34
1 changed files with 1 additions and 1 deletions
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2
arch/arm64/include/asm/processor.h
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@ -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.