mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-19 02:34:01 +08:00
536788fe2d
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> |
||
|---|---|---|
| .. | ||
| skas | ||
| asm-offsets.c | ||
| config.c.in | ||
| dyn.lds.S | ||
| exec.c | ||
| exitcode.c | ||
| gmon_syms.c | ||
| gprof_syms.c | ||
| init_task.c | ||
| initrd.c | ||
| irq.c | ||
| ksyms.c | ||
| Makefile | ||
| mem.c | ||
| physmem.c | ||
| process.c | ||
| ptrace.c | ||
| reboot.c | ||
| sigio.c | ||
| signal.c | ||
| smp.c | ||
| syscall.c | ||
| sysrq.c | ||
| time.c | ||
| tlb.c | ||
| trap.c | ||
| uaccess.c | ||
| um_arch.c | ||
| umid.c | ||
| uml.lds.S | ||
| vmlinux.lds.S | ||