powerpc/audit: Convert powerpc to AUDIT_ARCH_COMPAT_GENERIC

Commit e65e1fc ("[PATCH] syscall class hookup for all normal
targets") added generic support for AUDIT but that didn't include
support for bi-arch like powerpc.

Commit 4b58841 ("audit: Add generic compat syscall support")
added generic support for bi-arch.

Convert powerpc to that bi-arch generic audit support.

With this change generated text is similar.

Thomas has confirmed that the previously failing filter_exclude/test
is now successful both without and with this patch, see [1]

[1] https://lore.kernel.org/all/20260306115350-ef265661-6d6b-4043-9bd0-8e6b437d0d67@linutronix.de/

Link: linuxppc/issues#412
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/261b1be5b8dc526b83d73e8281e682a73536ea28.1773155031.git.chleroy@kernel.org

Author: chleroy

arch/powerpc/Kconfig

@@ -189,6 +189,7 @@ config PPC
 	select ARCH_WANT_OPTIMIZE_DAX_VMEMMAP	if PPC_RADIX_MMU
 	select ARCH_WANTS_MODULES_DATA_IN_VMALLOC	if PPC_BOOK3S_32 || PPC_8xx
 	select ARCH_WEAK_RELEASE_ACQUIRE
+	select AUDIT_ARCH_COMPAT_GENERIC
 	select BINFMT_ELF
 	select BUILDTIME_TABLE_SORT
 	select CLONE_BACKWARDS
@@ -371,10 +372,6 @@ config GENERIC_TBSYNC
 	bool
 	default y if PPC32 && SMP
 
-config AUDIT_ARCH
-	bool
-	default y
-
 config GENERIC_BUG
 	bool
 	default y

arch/powerpc/include/asm/unistd32.h

@@ -0,0 +1,7 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+#ifndef _ASM_POWERPC_UNISTD32_H_
+#define _ASM_POWERPC_UNISTD32_H_
+
+#include <asm/unistd_32.h>
+
+#endif /* _ASM_POWERPC_UNISTD32_H_ */

arch/powerpc/kernel/Makefile

@@ -149,9 +149,6 @@ obj-$(CONFIG_PCI)		+= pci_$(BITS).o $(pci64-y) \
 				   pci-common.o pci_of_scan.o
 obj-$(CONFIG_PCI_MSI)		+= msi.o
 
-obj-$(CONFIG_AUDIT)		+= audit.o
-obj64-$(CONFIG_AUDIT)		+= compat_audit.o
-
 obj-y				+= trace/
 
 ifneq ($(CONFIG_PPC_INDIRECT_PIO),y)