powerpc/crash: Fix non-smp kexec preparation

[ Upstream commit 882b25af265de8e05c66f72b9a29f6047102958f ]

In non-smp configurations, crash_kexec_prepare is never called in
the crash shutdown path. One result of this is that the crashing_cpu
variable is never set, preventing crash_save_cpu from storing the
NT_PRSTATUS elf note in the core dump.

Fixes: c7255058b543 ("powerpc/crash: save cpu register data in crash_smp_send_stop()")
Signed-off-by: Eddie James <eajames@linux.ibm.com>
Reviewed-by: Hari Bathini <hbathini@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250211162054.857762-1-eajames@linux.ibm.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/arch/powerpc/kexec/crash.c b/arch/powerpc/kexec/crash.c
index 252724ed666a3a5cb6c853ce46f64d01484ac9f1..14abe7046cd7431f520f1ba1d20e136268df49ee 100644 (file)
--- a/arch/powerpc/kexec/crash.c
+++ b/arch/powerpc/kexec/crash.c
@@ -356,7 +356,10 @@ void default_machine_crash_shutdown(struct pt_regs *regs)
        if (TRAP(regs) == INTERRUPT_SYSTEM_RESET)
                is_via_system_reset = 1;
 
-       crash_smp_send_stop();
+       if (IS_ENABLED(CONFIG_SMP))
+               crash_smp_send_stop();
+       else
+               crash_kexec_prepare();
 
        crash_save_cpu(regs, crashing_cpu);