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| author | Santosh Shilimkar <santosh.shilimkar@ti.com> | 2013-07-31 12:44:42 -0400 |
|---|---|---|
| committer | Santosh Shilimkar <santosh.shilimkar@ti.com> | 2013-10-10 20:25:06 -0400 |
| commit | 4dc9a81715973cb137a14399420bb35b0ed7d6ef (patch) | |
| tree | cb54075d8504d655d9aa422dbe38e072e7a0cdc3 /arch/arm/kernel/smp.c | |
| parent | ca5a45c06cd4764fb8510740f7fc550d9a0208d4 (diff) | |
| download | lwn-4dc9a81715973cb137a14399420bb35b0ed7d6ef.tar.gz lwn-4dc9a81715973cb137a14399420bb35b0ed7d6ef.zip | |
ARM: mm: Introduce virt_to_idmap() with an arch hook
On some PAE systems (e.g. TI Keystone), memory is above the
32-bit addressable limit, and the interconnect provides an
aliased view of parts of physical memory in the 32-bit addressable
space. This alias is strictly for boot time usage, and is not
otherwise usable because of coherency limitations. On such systems,
the idmap mechanism needs to take this aliased mapping into account.
This patch introduces virt_to_idmap() and a arch function pointer which
can be populated by platform which needs it. Also populate necessary
idmap spots with now available virt_to_idmap(). Avoided #ifdef approach
to be compatible with multi-platform builds.
Most architecture won't touch it and in that case virt_to_idmap()
fall-back to existing virt_to_phys() macro.
Cc: Russell King <linux@arm.linux.org.uk>
Acked-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Diffstat (limited to 'arch/arm/kernel/smp.c')
| -rw-r--r-- | arch/arm/kernel/smp.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c index 72024ea8a3a6..a0eb830c3daf 100644 --- a/arch/arm/kernel/smp.c +++ b/arch/arm/kernel/smp.c @@ -80,7 +80,7 @@ void __init smp_set_ops(struct smp_operations *ops) static unsigned long get_arch_pgd(pgd_t *pgd) { - phys_addr_t pgdir = virt_to_phys(pgd); + phys_addr_t pgdir = virt_to_idmap(pgd); BUG_ON(pgdir & ARCH_PGD_MASK); return pgdir >> ARCH_PGD_SHIFT; } |