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authorHugh Dickins <hugh@veritas.com>2005-11-23 22:37:37 +0100
committerLinus Torvalds <torvalds@g5.osdl.org>2005-11-24 01:08:38 +0100
commit7b6ac9dffe6f4dd8776908b234ac1410ed15f112 (patch)
tree1e30fde299519eb964899be79560599e04a32a66 /lib/crc32defs.h
parent[PATCH] revert floppy-fix-read-only-handling (diff)
downloadlinux-7b6ac9dffe6f4dd8776908b234ac1410ed15f112.tar.xz
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[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 'lib/crc32defs.h')
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