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ARM: 7294/1: vectors: use gate_vma for vectors user mapping

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The current user mapping for the vectors page is inserted as a `horrible
hack vma' into each task via arch_setup_additional_pages. This causes
problems with the MM subsystem and vm_normal_page, as described here:

https://lkml.org/lkml/2012/1/14/55

Following the suggestion from Hugh in the above thread, this patch uses
the gate_vma for the vectors user mapping, therefore consolidating
the horrible hack VMAs into one.

Acked-and-Tested-by: Nicolas Pitre <nico@linaro.org>

Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Will Deacon
2012-01-20 12:01:13 +01:00
committed by Russell King
parent 195864cf3d
commit f9d4861fc3
4 changed files with 31 additions and 42 deletions
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arch/arm/include/asm/page.h
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@@ -151,6 +151,8 @@ extern void __cpu_copy_user_highpage(struct page *to, struct page *from,
#define clear_page(page) memset((void *)(page), 0, PAGE_SIZE)
extern void copy_page(void *to, const void *from);
#define __HAVE_ARCH_GATE_AREA 1
#ifdef CONFIG_ARM_LPAE
#include <asm/pgtable-3level-types.h>
#else