Add ppc buildfix for ELN

Signed-off-by: Justin M. Forbes <jforbes@fedoraproject.org>

patch-6.3-redhat.patch

@@ -3014,3 +3014,102 @@ index cf6cc576736f..3653a4f35265 100644
  #ifdef CONFIG_PERF_EVENTS
  int security_perf_event_open(struct perf_event_attr *attr, int type)
  {
+From 08cebf1329a31940a8783c447969ad09b6d0c607 Mon Sep 17 00:00:00 2001
+From: Marco Elver <elver@google.com>
+Date: Mon, 27 Feb 2023 10:47:27 +0100
+Subject: [PATCH] kasan, powerpc: Don't rename memintrinsics if compiler adds
+ prefixes
+
+With appropriate compiler support [1], KASAN builds use __asan prefixed
+meminstrinsics, and KASAN no longer overrides memcpy/memset/memmove.
+
+If compiler support is detected (CC_HAS_KASAN_MEMINTRINSIC_PREFIX),
+define memintrinsics normally (do not prefix '__').
+
+On powerpc, KASAN is the only user of __mem functions, which are used to
+define instrumented memintrinsics. Alias the normal versions for KASAN
+to use in its implementation.
+
+Link: https://lore.kernel.org/all/20230224085942.1791837-1-elver@google.com/ [1]
+Link: https://lore.kernel.org/oe-kbuild-all/202302271348.U5lvmo0S-lkp@intel.com/
+Reported-by: kernel test robot <lkp@intel.com>
+Signed-off-by: Marco Elver <elver@google.com>
+Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc)
+---
+ arch/powerpc/include/asm/kasan.h       |  2 +-
+ arch/powerpc/include/asm/string.h      | 15 +++++++++++----
+ arch/powerpc/kernel/prom_init_check.sh |  9 +++++++--
+ 3 files changed, 19 insertions(+), 7 deletions(-)
+
+diff --git a/arch/powerpc/include/asm/kasan.h b/arch/powerpc/include/asm/kasan.h
+index 92a968202ba7..365d2720097c 100644
+--- a/arch/powerpc/include/asm/kasan.h
++++ b/arch/powerpc/include/asm/kasan.h
+@@ -2,7 +2,7 @@
+ #ifndef __ASM_KASAN_H
+ #define __ASM_KASAN_H
+
+-#ifdef CONFIG_KASAN
++#if defined(CONFIG_KASAN) && !defined(CONFIG_CC_HAS_KASAN_MEMINTRINSIC_PREFIX)
+ #define _GLOBAL_KASAN(fn)	_GLOBAL(__##fn)
+ #define _GLOBAL_TOC_KASAN(fn)	_GLOBAL_TOC(__##fn)
+ #define EXPORT_SYMBOL_KASAN(fn)	EXPORT_SYMBOL(__##fn)
+diff --git a/arch/powerpc/include/asm/string.h b/arch/powerpc/include/asm/string.h
+index 2aa0e31e6884..60ba22770f51 100644
+--- a/arch/powerpc/include/asm/string.h
++++ b/arch/powerpc/include/asm/string.h
+@@ -30,11 +30,17 @@ extern int memcmp(const void *,const void *,__kernel_size_t);
+ extern void * memchr(const void *,int,__kernel_size_t);
+ void memcpy_flushcache(void *dest, const void *src, size_t size);
+
++#ifdef CONFIG_KASAN
++/* __mem variants are used by KASAN to implement instrumented meminstrinsics. */
++#ifdef CONFIG_CC_HAS_KASAN_MEMINTRINSIC_PREFIX
++#define __memset memset
++#define __memcpy memcpy
++#define __memmove memmove
++#else /* CONFIG_CC_HAS_KASAN_MEMINTRINSIC_PREFIX */
+ void *__memset(void *s, int c, __kernel_size_t count);
+ void *__memcpy(void *to, const void *from, __kernel_size_t n);
+ void *__memmove(void *to, const void *from, __kernel_size_t n);
+-
+-#if defined(CONFIG_KASAN) && !defined(__SANITIZE_ADDRESS__)
++#ifndef __SANITIZE_ADDRESS__
+ /*
+  * For files that are not instrumented (e.g. mm/slub.c) we
+  * should use not instrumented version of mem* functions.
+@@ -46,8 +52,9 @@ void *__memmove(void *to, const void *from, __kernel_size_t n);
+ #ifndef __NO_FORTIFY
+ #define __NO_FORTIFY /* FORTIFY_SOURCE uses __builtin_memcpy, etc. */
+ #endif
+-
+-#endif
++#endif /* !__SANITIZE_ADDRESS__ */
++#endif /* CONFIG_CC_HAS_KASAN_MEMINTRINSIC_PREFIX */
++#endif /* CONFIG_KASAN */
+
+ #ifdef CONFIG_PPC64
+ #ifndef CONFIG_KASAN
+diff --git a/arch/powerpc/kernel/prom_init_check.sh b/arch/powerpc/kernel/prom_init_check.sh
+index 5a319863f289..69623b9045d5 100644
+--- a/arch/powerpc/kernel/prom_init_check.sh
++++ b/arch/powerpc/kernel/prom_init_check.sh
+@@ -13,8 +13,13 @@
+ # If you really need to reference something from prom_init.o add
+ # it to the list below:
+
+-grep "^CONFIG_KASAN=y$" ${KCONFIG_CONFIG} >/dev/null
+-if [ $? -eq 0 ]
++has_renamed_memintrinsics()
++{
++	grep -q "^CONFIG_KASAN=y$" ${KCONFIG_CONFIG} && \
++		! grep -q "^CONFIG_CC_HAS_KASAN_MEMINTRINSIC_PREFIX=y" ${KCONFIG_CONFIG}
++}
++
++if has_renamed_memintrinsics
+ then
+ 	MEM_FUNCS="__memcpy __memset"
+ else
+-- 
+2.39.2
+