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Martin Schwidefsky 2f569afd9c CONFIG_HIGHPTE vs. sub-page page tables. ... Background: I've implemented 1K/2K page tables for s390. These sub-page page tables are required to properly support the s390 virtualization instruction with KVM. The SIE instruction requires that the page tables have 256 page table entries (pte) followed by 256 page status table entries (pgste). The pgstes are only required if the process is using the SIE instruction. The pgstes are updated by the hardware and by the hypervisor for a number of reasons, one of them is dirty and reference bit tracking. To avoid wasting memory the standard pte table allocation should return 1K/2K (31/64 bit) and 2K/4K if the process is using SIE. Problem: Page size on s390 is 4K, page table size is 1K or 2K. That means the s390 version for pte_alloc_one cannot return a pointer to a struct page. Trouble is that with the CONFIG_HIGHPTE feature on x86 pte_alloc_one cannot return a pointer to a pte either, since that would require more than 32 bit for the return value of pte_alloc_one (and the pte * would not be accessible since its not kmapped). Solution: The only solution I found to this dilemma is a new typedef: a pgtable_t. For s390 pgtable_t will be a (pte *) - to be introduced with a later patch. For everybody else it will be a (struct page *). The additional problem with the initialization of the ptl lock and the NR_PAGETABLE accounting is solved with a constructor pgtable_page_ctor and a destructor pgtable_page_dtor. The page table allocation and free functions need to call these two whenever a page table page is allocated or freed. pmd_populate will get a pgtable_t instead of a struct page pointer. To get the pgtable_t back from a pmd entry that has been installed with pmd_populate a new function pmd_pgtable is added. It replaces the pmd_page call in free_pte_range and apply_to_pte_range. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: <linux-arch@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		17 years ago
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acpi	Merge branches 'release' and 'fluff' into release	17 years ago
asm-alpha	CONFIG_HIGHPTE vs. sub-page page tables.	17 years ago
asm-arm	CONFIG_HIGHPTE vs. sub-page page tables.	17 years ago
asm-avr32	CONFIG_HIGHPTE vs. sub-page page tables.	17 years ago
asm-blackfin	asm-*/posix_types.h: scrub __GLIBC__	17 years ago
asm-cris	CONFIG_HIGHPTE vs. sub-page page tables.	17 years ago
asm-frv	CONFIG_HIGHPTE vs. sub-page page tables.	17 years ago
asm-generic	asm-generic: remove fastcall	17 years ago
asm-h8300	avoid overflows in kernel/time.c	17 years ago
asm-ia64	CONFIG_HIGHPTE vs. sub-page page tables.	17 years ago
asm-m32r	CONFIG_HIGHPTE vs. sub-page page tables.	17 years ago
asm-m68k	CONFIG_HIGHPTE vs. sub-page page tables.	17 years ago
asm-m68knommu	avoid overflows in kernel/time.c	17 years ago
asm-mips	CONFIG_HIGHPTE vs. sub-page page tables.	17 years ago
asm-mn10300	mn10300: add the MN10300/AM33 architecture to the kernel	17 years ago
asm-parisc	CONFIG_HIGHPTE vs. sub-page page tables.	17 years ago
asm-powerpc	CONFIG_HIGHPTE vs. sub-page page tables.	17 years ago
asm-ppc	CONFIG_HIGHPTE vs. sub-page page tables.	17 years ago
asm-s390	CONFIG_HIGHPTE vs. sub-page page tables.	17 years ago
asm-sh	CONFIG_HIGHPTE vs. sub-page page tables.	17 years ago
asm-sparc	CONFIG_HIGHPTE vs. sub-page page tables.	17 years ago
asm-sparc64	CONFIG_HIGHPTE vs. sub-page page tables.	17 years ago
asm-um	CONFIG_HIGHPTE vs. sub-page page tables.	17 years ago
asm-v850	avoid overflows in kernel/time.c	17 years ago
asm-x86	CONFIG_HIGHPTE vs. sub-page page tables.	17 years ago
asm-xtensa	CONFIG_HIGHPTE vs. sub-page page tables.	17 years ago
crypto	…
keys	…
linux	CONFIG_HIGHPTE vs. sub-page page tables.	17 years ago
math-emu	…
media	include/media/: Spelling fixes	17 years ago
mtd	Merge git://git.infradead.org/~dedekind/ubi-2.6	17 years ago
net	9p: add support for sticky bit	17 years ago
pcmcia	pcmcia: replace kio_addr_t with unsigned int everywhere	17 years ago
rdma	…
rxrpc	…
scsi	[SCSI] Small cleanups for scsi_host.h	17 years ago
sound	[ALSA] version 1.0.16rc2	17 years ago
video	atmel_lcdfb: backlight control	17 years ago
xen	…
Kbuild	…