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author | Hugh Dickins <hugh@veritas.com> | 2005-11-23 13:37:37 -0800 |
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committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-11-23 16:08:38 -0800 |
commit | 7b6ac9dffe6f4dd8776908b234ac1410ed15f112 (patch) | |
tree | 1e30fde299519eb964899be79560599e04a32a66 /CREDITS | |
parent | c101e77301877086e6f977fcfb140d1cbbe23fd5 (diff) | |
download | linux-7b6ac9dffe6f4dd8776908b234ac1410ed15f112.tar.bz2 |
[PATCH] mm: update split ptlock Kconfig
Closer attention to the arithmetic shows that neither ppc64 nor sparc really
uses one page for multiple page tables: how on earth could they, while
pte_alloc_one returns just a struct page pointer, with no offset?
Well, arm26 manages it by returning a pte_t pointer cast to a struct page
pointer, harumph, then compensating in its pmd_populate. But arm26 is never
SMP, so it's not a problem for split ptlock either.
And the PA-RISC situation has been recently improved: CONFIG_PA20 works
without the 16-byte alignment which inflated its spinlock_t. But the current
union of spinlock_t with private does make the 7xxx struct page significantly
larger, even without debug, so disable its split ptlock.
Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'CREDITS')
0 files changed, 0 insertions, 0 deletions