uapi headers: simplify the <linux/compiler.h> stuff.
We don't really need <linux/compiler.h> and <linux/compiler_types.h>. We
already have a mechanism to remove unused macros, so let's do that. We
don't currently have a way to remove unused #includes, so we still need
<linux/compiler.h> and <linux/compiler_types.h> files (but I've clarified
the comments in them).
I've kept the empty definitions of `__user` and `__force` for source
compatibility. (We had one security test at least that was assuming
a kernel struct definition will "just work".)
Bug: http://b/262917450
Test: treehugger
Change-Id: Iacbbbc1aeef9a4fac52dabd7811ab875cc267d4f
diff --git a/libc/kernel/uapi/asm-generic/signal-defs.h b/libc/kernel/uapi/asm-generic/signal-defs.h
index c7e9504..dea8fbc 100644
--- a/libc/kernel/uapi/asm-generic/signal-defs.h
+++ b/libc/kernel/uapi/asm-generic/signal-defs.h
@@ -55,11 +55,11 @@
#endif
#ifndef __ASSEMBLY__
typedef void __signalfn_t(int);
-typedef __signalfn_t __user * __sighandler_t;
+typedef __signalfn_t * __sighandler_t;
typedef void __restorefn_t(void);
-typedef __restorefn_t __user * __sigrestore_t;
-#define SIG_DFL ((__force __sighandler_t) 0)
-#define SIG_IGN ((__force __sighandler_t) 1)
-#define SIG_ERR ((__force __sighandler_t) - 1)
+typedef __restorefn_t * __sigrestore_t;
+#define SIG_DFL (( __sighandler_t) 0)
+#define SIG_IGN (( __sighandler_t) 1)
+#define SIG_ERR (( __sighandler_t) - 1)
#endif
#endif