5.15-stable review patch. If anyone has any objections, please let me know.
------------------
From: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
commit 17c743b9da9e0d073ff19fd5313f521744514939 upstream.
Building the sigaltstack test with GCC on 64-bit powerpc errors with:
gcc -Wall sas.c -o /home/michael/linux/.build/kselftest/sigaltstack/sas
In file included from sas.c:23:
current_stack_pointer.h:22:2: error: #error "implement current_stack_pointer equivalent"
22 | #error "implement current_stack_pointer equivalent"
| ^~~~~
sas.c: In function ‘my_usr1’:
sas.c:50:13: error: ‘sp’ undeclared (first use in this function); did you mean ‘p’?
50 | if (sp < (unsigned long)sstack ||
| ^~
This happens because GCC doesn't define __ppc__ for 64-bit builds, only
32-bit builds. Instead use __powerpc__ to detect powerpc builds, which
is defined by clang and GCC for 64-bit and 32-bit builds.
Fixes: 05107edc9101 ("selftests: sigaltstack: fix -Wuninitialized")
Cc: stable@xxxxxxxxxxxxxxx # v6.3+
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Link: https://msgid.link/20240520062647.688667-1-mpe@xxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
tools/testing/selftests/sigaltstack/current_stack_pointer.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/tools/testing/selftests/sigaltstack/current_stack_pointer.h
+++ b/tools/testing/selftests/sigaltstack/current_stack_pointer.h
@@ -8,7 +8,7 @@ register unsigned long sp asm("sp");
register unsigned long sp asm("esp");
#elif __loongarch64
register unsigned long sp asm("$sp");
-#elif __ppc__
+#elif __powerpc__
register unsigned long sp asm("r1");
#elif __s390x__
register unsigned long sp asm("%15");
