]> pilppa.com Git - linux-2.6-omap-h63xx.git/commit
uml: stop saving process FP state
authorJeff Dike <jdike@addtoit.com>
Tue, 16 Oct 2007 08:26:47 +0000 (01:26 -0700)
committerLinus Torvalds <torvalds@woody.linux-foundation.org>
Tue, 16 Oct 2007 16:43:05 +0000 (09:43 -0700)
commit42daba316557e597a90a730f61c762602b7f0e0c
tree9b7e9da84cef7d2547c577f1cf94b408cf308619
parent5c8aaceab88ac787c0a4038b29143c954c2a45e0
uml: stop saving process FP state

Throw out a lot of code dealing with saving and restoring floating-point
state.  In skas mode, where processes run in a restoring floating-point state
on kernel entry and exit is pointless.

This eliminates most of arch/um/os-Linux/sys-{i386,x86_64}/registers.c.  Most
of what remained is now arch-indpendent, and can be moved up to
arch/um/os-Linux/registers.c.  Both arches need the jmp_buf accessor
get_thread_reg, and i386 needs {save,restore}_fp_regs because it cheats during
sigreturn by getting the fp state using ptrace rather than copying it out of
the process sigcontext.

After this, it turns out that arch/um/include/skas/mode-skas.h is almost
completely unneeded.  The declarations in it are variables which either don't
exist or which don't have global scope.  The one exception is
kill_off_processes_skas.  If that's removed, this header can be deleted.

This uncovered a bug in user.h, which wasn't correctly making sure that a
size_t definition was available to both userspace and kernelspace files.

Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
12 files changed:
arch/um/include/os.h
arch/um/include/registers.h
arch/um/include/skas/mode-skas.h
arch/um/include/sysdep-i386/ptrace.h
arch/um/include/user.h
arch/um/os-Linux/Makefile
arch/um/os-Linux/registers.c [new file with mode: 0644]
arch/um/os-Linux/skas/mem.c
arch/um/os-Linux/skas/process.c
arch/um/os-Linux/sys-i386/registers.c
arch/um/os-Linux/sys-x86_64/Makefile
arch/um/os-Linux/sys-x86_64/registers.c