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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>		17 years ago
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alpha	avoid overflows in kernel/time.c	17 years ago
arm	…
avr32	…
blackfin	…
cris	avoid overflows in kernel/time.c	17 years ago
frv	CONFIG_HIGHPTE vs. sub-page page tables.	17 years ago
h8300	avoid overflows in kernel/time.c	17 years ago
ia64	…
m32r	avoid overflows in kernel/time.c	17 years ago
m68k	avoid overflows in kernel/time.c	17 years ago
m68knommu	avoid overflows in kernel/time.c	17 years ago
mips	MIPS: Mark all but i8259 interrupts as no-probe.	17 years ago
mn10300	…
parisc	…
powerpc	CONFIG_HIGHPTE vs. sub-page page tables.	17 years ago
ppc	CONFIG_HIGHPTE vs. sub-page page tables.	17 years ago
s390	CONFIG_HIGHPTE vs. sub-page page tables.	17 years ago
sh	…
sparc	CONFIG_HIGHPTE vs. sub-page page tables.	17 years ago
sparc64	…
um	uml: runtime host VMSPLIT detection	17 years ago
v850	avoid overflows in kernel/time.c	17 years ago
x86	CONFIG_HIGHPTE vs. sub-page page tables.	17 years ago
xtensa	avoid overflows in kernel/time.c	17 years ago
.gitignore	…
Kconfig	…