diff options
| author | Zachary Amsden <[email protected]> | 2006-10-01 06:29:36 +0000 |
|---|---|---|
| committer | Linus Torvalds <[email protected]> | 2006-10-01 07:39:34 +0000 |
| commit | d6d861e3c963b4077c83e078e3e300c4b81f93e7 (patch) | |
| tree | 842071ac905575aa0ea8bedd3a1ac5db29416bcf /lib/genalloc.c | |
| parent | [PATCH] paravirt: kpte flush (diff) | |
| download | kernel-d6d861e3c963b4077c83e078e3e300c4b81f93e7.tar.gz kernel-d6d861e3c963b4077c83e078e3e300c4b81f93e7.zip | |
[PATCH] paravirt: optimize ptep establish for pae
The ptep_establish macro is only used on user-level PTEs, for P->P mapping
changes. Since these always happen under protection of the pagetable lock,
the strong synchronization of a 64-bit cmpxchg is not needed, in fact, not
even a lock prefix needs to be used. We can simply instead clear the P-bit,
followed by a normal set. The write ordering is still important to avoid the
possibility of the TLB snooping a partially written PTE and getting a bad
mapping installed.
Signed-off-by: Zachary Amsden <[email protected]>
Cc: Rusty Russell <[email protected]>
Cc: Jeremy Fitzhardinge <[email protected]>
Cc: Andi Kleen <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Diffstat (limited to 'lib/genalloc.c')
0 files changed, 0 insertions, 0 deletions