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| author | Jeremy Fitzhardinge <jeremy@goop.org> | 2008-07-01 16:46:36 -0700 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-07-08 13:16:29 +0200 |
| commit | ef5e94af16c0c82452e1ea5d387e1203dd2198d6 (patch) | |
| tree | 7d80d1bba8a0c58e91995ead6f8b2cd6eddd314e /kernel/backtracetest.c | |
| parent | 8490638cf0fb3975f7636c5268f27d5daf4eaaa5 (diff) | |
| download | lwn-ef5e94af16c0c82452e1ea5d387e1203dd2198d6.tar.gz lwn-ef5e94af16c0c82452e1ea5d387e1203dd2198d6.zip | |
x86_32: remove __PAGE_KERNEL(_EXEC)
From: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Older x86-32 processors do not support global mappings (PGD), so must
only use it if the processor supports it.
The _PAGE_KERNEL* flags always have _PAGE_KERNEL set, since logically
we always want it set.
This is OK even on processors which do not support PGD, since all
_PAGE flags are masked with __supported_pte_mask before being turned
into a real in-pagetable pte. On 32-bit systems, __supported_pte_mask
is initialized to not contain _PAGE_GLOBAL, and it is then added if
the CPU is found to support it.
The x86-32 code used to use __PAGE_KERNEL/__PAGE_KERNEL_EXEC for this
purpose, but they're now redundant and can be removed.
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: Stephen Tweedie <sct@redhat.com>
Cc: Eduardo Habkost <ehabkost@redhat.com>
Cc: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/backtracetest.c')
0 files changed, 0 insertions, 0 deletions