powerpc/kdump: Fix powernv build break when KEXEC_CORE=n

Web:        https://git.kernel.org/torvalds/c/910961754572a2f4c83ad7e610d180e3e6c29bda
Commit:     910961754572a2f4c83ad7e610d180e3e6c29bda
Parent:     82343484a2d4c97a03bfd81303b5493c65f05c50
Refname:    refs/heads/master
Author:     Guenter Roeck <[email protected]>
AuthorDate: Mon Feb 12 14:34:07 2018 -0800
Committer:  Michael Ellerman <[email protected]>
CommitDate: Tue Feb 13 22:39:37 2018 +1100

    powerpc/kdump: Fix powernv build break when KEXEC_CORE=n
    
    If KEXEC_CORE is not enabled, powernv builds fail as follows.
    
      arch/powerpc/platforms/powernv/smp.c: In function 'pnv_smp_cpu_kill_self':
      arch/powerpc/platforms/powernv/smp.c:236:4: error:
            implicit declaration of function 'crash_ipi_callback'
    
    Add dummy function calls, similar to kdump_in_progress(), to solve the
    problem.
    
    Fixes: 4145f358644b ("powernv/kdump: Fix cases where the kdump kernel can get HMI's")
    Signed-off-by: Guenter Roeck <[email protected]>
    Acked-by: Balbir Singh <[email protected]>
    Signed-off-by: Michael Ellerman <[email protected]>
---
 arch/powerpc/include/asm/kexec.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/powerpc/include/asm/kexec.h b/arch/powerpc/include/asm/kexec.h
index 9dcbfa6bbb91..d8b1e8e7e035 100644
--- a/arch/powerpc/include/asm/kexec.h
+++ b/arch/powerpc/include/asm/kexec.h
@@ -140,6 +140,12 @@ static inline bool kdump_in_progress(void)
 	return false;
 }
 
+static inline void crash_ipi_callback(struct pt_regs *regs) { }
+
+static inline void crash_send_ipi(void (*crash_ipi_callback)(struct pt_regs *))
+{
+}
+
 #endif /* CONFIG_KEXEC_CORE */
 #endif /* ! __ASSEMBLY__ */
 #endif /* __KERNEL__ */
--
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