[GIT PULL] Kselftest fixes update for Linux 6.3-rc5

[Shuah Khan]

Hi Linus,

Please pull the following Kselftest fixes update for Linux 6.3-rc5.

This Kselftest fixes update for Linux 6.3-rc5 consists of one single
fix for sigaltstack test -Wuninitialized warning found when building
with clang.

diff is attached.

thanks,
-- Shuah

----------------------------------------------------------------
The following changes since commit 624c60f326c6e5a80b008e8a5c7feffe8c27dc72:

  selftests: fix LLVM build for i386 and x86_64 (2023-03-10 13:41:10 -0700)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest tags/linux-kselftest-fixes-6.3-rc5

for you to fetch changes up to 05107edc910135d27fe557267dc45be9630bf3dd:

  selftests: sigaltstack: fix -Wuninitialized (2023-03-20 17:28:31 -0600)

----------------------------------------------------------------
linux-kselftest-fixes-6.3-rc5

This Kselftest fixes update for Linux 6.3-rc5 consists of one single
fix for sigaltstack test -Wuninitialized warning found when building
with clang.

----------------------------------------------------------------
Nick Desaulniers (1):
      selftests: sigaltstack: fix -Wuninitialized

 .../selftests/sigaltstack/current_stack_pointer.h  | 23 ++++++++++++++++++++++
 tools/testing/selftests/sigaltstack/sas.c          |  7 +------
 2 files changed, 24 insertions(+), 6 deletions(-)
 create mode 100644 tools/testing/selftests/sigaltstack/current_stack_pointer.
----------------------------------------------------------------diff --git a/tools/testing/selftests/sigaltstack/current_stack_pointer.h b/tools/testing/selftests/sigaltstack/current_stack_pointer.h
new file mode 100644
index 000000000000..ea9bdf3a90b1
--- /dev/null
+++ b/tools/testing/selftests/sigaltstack/current_stack_pointer.h
@@ -0,0 +1,23 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#if __alpha__
+register unsigned long sp asm("$30");
+#elif __arm__ || __aarch64__ || __csky__ || __m68k__ || __mips__ || __riscv
+register unsigned long sp asm("sp");
+#elif __i386__
+register unsigned long sp asm("esp");
+#elif __loongarch64
+register unsigned long sp asm("$sp");
+#elif __ppc__
+register unsigned long sp asm("r1");
+#elif __s390x__
+register unsigned long sp asm("%15");
+#elif __sh__
+register unsigned long sp asm("r15");
+#elif __x86_64__
+register unsigned long sp asm("rsp");
+#elif __XTENSA__
+register unsigned long sp asm("a1");
+#else
+#error "implement current_stack_pointer equivalent"
+#endif
diff --git a/tools/testing/selftests/sigaltstack/sas.c b/tools/testing/selftests/sigaltstack/sas.c
index c53b070755b6..98d37cb744fb 100644
--- a/tools/testing/selftests/sigaltstack/sas.c
+++ b/tools/testing/selftests/sigaltstack/sas.c
@@ -20,6 +20,7 @@
 #include <sys/auxv.h>
 
 #include "../kselftest.h"
+#include "current_stack_pointer.h"
 
 #ifndef SS_AUTODISARM
 #define SS_AUTODISARM  (1U << 31)
@@ -46,12 +47,6 @@ void my_usr1(int sig, siginfo_t *si, void *u)
 	stack_t stk;
 	struct stk_data *p;
 
-#if __s390x__
-	register unsigned long sp asm("%15");
-#else
-	register unsigned long sp asm("sp");
-#endif
-
 	if (sp < (unsigned long)sstack ||
 			sp >= (unsigned long)sstack + stack_size) {
 		ksft_exit_fail_msg("SP is not on sigaltstack\n");