powerpc: drop dependency on <asm/machdep.h> in archrandom.h

archrandom.h includes <asm/machdep.h> to refer ppc_md. This causes
circular header dependency, if generic nodemask.h  includes random.h:

In file included from include/linux/cred.h:16,
                 from include/linux/seq_file.h:13,
                 from arch/powerpc/include/asm/machdep.h:6,
                 from arch/powerpc/include/asm/archrandom.h:5,
                 from include/linux/random.h:109,
                 from include/linux/nodemask.h:97,
                 from include/linux/list_lru.h:12,
                 from include/linux/fs.h:13,
                 from include/linux/compat.h:17,
                 from arch/powerpc/kernel/asm-offsets.c:12:
include/linux/sched.h:1203:9: error: unknown type name 'nodemask_t'
 1203 |         nodemask_t                      mems_allowed;
      |         ^~~~~~~~~~

Fix it by removing <asm/machdep.h> dependency from archrandom.h

Now as arch_get_random_seed_long() moved to c-file, and not exported,
it's not available for modules. As Michael Ellerman says:

  I think we actually don't need it exported to modules, I think it's
  a private detail of the RNG <-> architecture interface, not something
  that modules should be calling.

CC: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
CC: Benjamin Herrenschmidt <benh@kernel.crashing.org>
CC: Michael Ellerman <mpe@ellerman.id.au>
CC: Paul Mackerras <paulus@samba.org>
CC: Rasmus Villemoes <linux@rasmusvillemoes.dk>
CC: Stephen Rothwell <sfr@canb.auug.org.au>
CC: linuxppc-dev@lists.ozlabs.org
Suggested-by: Michael Ellerman <mpe@ellerman.id.au> (for non-exporting)
Acked-by: Michael Ellerman <mpe@ellerman.id.au>
Acked-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Yury Norov <yury.norov@gmail.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/arch/powerpc/kernel/setup-common.c b/arch/powerpc/kernel/setup-common.c
index eb0077b302e2..5175726c703d 100644
--- a/arch/powerpc/kernel/setup-common.c
+++ b/arch/powerpc/kernel/setup-common.c
@@ -171,6 +171,18 @@ EXPORT_SYMBOL_GPL(machine_power_off);
 void (*pm_power_off)(void);
 EXPORT_SYMBOL_GPL(pm_power_off);
 
+#ifdef CONFIG_ARCH_RANDOM
+bool __must_check arch_get_random_seed_long(unsigned long *v)
+{
+	if (ppc_md.get_random_seed)
+		return ppc_md.get_random_seed(v);
+
+	return false;
+}
+EXPORT_SYMBOL(arch_get_random_seed_long);
+
+#endif
+
 void machine_halt(void)
 {
 	machine_shutdown();