linux/include
Jeff Dike 536788fe2d uml: runtime host VMSPLIT detection
Calculate TASK_SIZE at run-time by figuring out the host's VMSPLIT - this is
needed on i386 if UML is to run on hosts with varying VMSPLITs without
recompilation.

TASK_SIZE is now defined in terms of a variable, task_size.  This gets rid of
an include of pgtable.h from processor.h, which can cause include loops.

On i386, task_size is calculated early in boot by probing the address space in
a binary search to figure out where the boundary between usable and non-usable
memory is.  This tries to make sure that a page that is considered to be in
userspace is, or can be made, read-write.  I'm concerned about a system-global
VDSO page in kernel memory being hit and considered to be a userspace page.

On x86_64, task_size is just the old value of CONFIG_TOP_ADDR.

A bunch of config variable are gone now.  CONFIG_TOP_ADDR is directly replaced
by TASK_SIZE.  NEST_LEVEL is gone since the relocation of the stubs makes it
irrelevant.  All the HOST_VMSPLIT stuff is gone.  All references to these in
arch/um/Makefile are also gone.

I noticed and fixed a missing extern in os.h when adding os_get_task_size.

Note: This has been revised to fix the 32-bit UML on 64-bit host bug that
Miklos ran into.

Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Cc: Miklos Szeredi <miklos@szeredi.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-02-08 09:22:42 -08:00
..
acpi
asm-alpha CONFIG_HIGHPTE vs. sub-page page tables. 2008-02-08 09:22:42 -08:00
asm-arm CONFIG_HIGHPTE vs. sub-page page tables. 2008-02-08 09:22:42 -08:00
asm-avr32 CONFIG_HIGHPTE vs. sub-page page tables. 2008-02-08 09:22:42 -08:00
asm-blackfin asm-*/posix_types.h: scrub __GLIBC__ 2008-02-08 09:22:34 -08:00
asm-cris CONFIG_HIGHPTE vs. sub-page page tables. 2008-02-08 09:22:42 -08:00
asm-frv CONFIG_HIGHPTE vs. sub-page page tables. 2008-02-08 09:22:42 -08:00
asm-generic asm-generic: remove fastcall 2008-02-08 09:22:31 -08:00
asm-h8300 avoid overflows in kernel/time.c 2008-02-08 09:22:39 -08:00
asm-ia64 CONFIG_HIGHPTE vs. sub-page page tables. 2008-02-08 09:22:42 -08:00
asm-m32r CONFIG_HIGHPTE vs. sub-page page tables. 2008-02-08 09:22:42 -08:00
asm-m68k CONFIG_HIGHPTE vs. sub-page page tables. 2008-02-08 09:22:42 -08:00
asm-m68knommu avoid overflows in kernel/time.c 2008-02-08 09:22:39 -08:00
asm-mips CONFIG_HIGHPTE vs. sub-page page tables. 2008-02-08 09:22:42 -08:00
asm-mn10300 mn10300: add the MN10300/AM33 architecture to the kernel 2008-02-08 09:22:30 -08:00
asm-parisc CONFIG_HIGHPTE vs. sub-page page tables. 2008-02-08 09:22:42 -08:00
asm-powerpc CONFIG_HIGHPTE vs. sub-page page tables. 2008-02-08 09:22:42 -08:00
asm-ppc CONFIG_HIGHPTE vs. sub-page page tables. 2008-02-08 09:22:42 -08:00
asm-s390 CONFIG_HIGHPTE vs. sub-page page tables. 2008-02-08 09:22:42 -08:00
asm-sh CONFIG_HIGHPTE vs. sub-page page tables. 2008-02-08 09:22:42 -08:00
asm-sparc CONFIG_HIGHPTE vs. sub-page page tables. 2008-02-08 09:22:42 -08:00
asm-sparc64 CONFIG_HIGHPTE vs. sub-page page tables. 2008-02-08 09:22:42 -08:00
asm-um uml: runtime host VMSPLIT detection 2008-02-08 09:22:42 -08:00
asm-v850 avoid overflows in kernel/time.c 2008-02-08 09:22:39 -08:00
asm-x86 CONFIG_HIGHPTE vs. sub-page page tables. 2008-02-08 09:22:42 -08:00
asm-xtensa CONFIG_HIGHPTE vs. sub-page page tables. 2008-02-08 09:22:42 -08:00
crypto
keys
linux CONFIG_HIGHPTE vs. sub-page page tables. 2008-02-08 09:22:42 -08:00
math-emu
media
mtd
net
pcmcia
rdma
rxrpc
scsi [SCSI] Small cleanups for scsi_host.h 2008-02-07 18:02:43 -06:00
sound
video
xen
Kbuild