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authorJeff Dike <jdike@addtoit.com>2007-10-16 01:26:47 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-16 09:43:05 -0700
commit42daba316557e597a90a730f61c762602b7f0e0c (patch)
tree9b7e9da84cef7d2547c577f1cf94b408cf308619 /arch/um/include/user.h
parent5c8aaceab88ac787c0a4038b29143c954c2a45e0 (diff)
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>
Diffstat (limited to 'arch/um/include/user.h')
-rw-r--r--arch/um/include/user.h8
1 files changed, 5 insertions, 3 deletions
diff --git a/arch/um/include/user.h b/arch/um/include/user.h
index d380e6d91a9..99033ff28a7 100644
--- a/arch/um/include/user.h
+++ b/arch/um/include/user.h
@@ -14,10 +14,12 @@
*/
#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
-/*
- * This will provide the size_t definition in both kernel and userspace builds
- */
+/* This is to get size_t */
+#ifdef __KERNEL__
#include <linux/types.h>
+#else
+#include <stddef.h>
+#endif
extern void panic(const char *fmt, ...)
__attribute__ ((format (printf, 1, 2)));