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ARM: idmap: add identity mapping usage note

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Add a note about the usage of the identity mapping; we do not support
accesses outside of the identity map region and kernel image while a
CPU is using the identity map.  This is because the identity mapping
may overwrite vmalloc space, IO mappings, the vectors pages, etc.

Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2014-07-29 12:18:34 +01:00
parent 811a2407a3
commit c5cc87fa8d
1 changed files with 5 additions and 0 deletions
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5
arch/arm/mm/idmap.c
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@ -9,6 +9,11 @@
#include <asm/sections.h> #include <asm/sections.h>
#include <asm/system_info.h> #include <asm/system_info.h>
/*
* Note: accesses outside of the kernel image and the identity map area
* are not supported on any CPU using the idmap tables as its current
* page tables.
*/
pgd_t *idmap_pgd; pgd_t *idmap_pgd;
phys_addr_t (*arch_virt_to_idmap) (unsigned long x); phys_addr_t (*arch_virt_to_idmap) (unsigned long x);