ARC: Allow SMP kernel to build/boot on UP-only infrastructure
In light of recent SNAFU with SMP build, allow simple platform to build
as SMP but run UP.
* Remove the dependence on simulation SMP extension to enable quick
build/test iterations of SMP kernel.
* In absence of platform SMP registration, prevent the NULL smp feature
name from borkign the system
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
diff --git a/arch/arc/include/asm/smp.h b/arch/arc/include/asm/smp.h
index 5d06eee..3845b9e 100644
--- a/arch/arc/include/asm/smp.h
+++ b/arch/arc/include/asm/smp.h
@@ -59,7 +59,15 @@
/* TBD: stop exporting it for direct population by platform */
extern struct plat_smp_ops plat_smp_ops;
-#endif /* CONFIG_SMP */
+#else /* CONFIG_SMP */
+
+static inline void smp_init_cpus(void) {}
+static inline const char *arc_platform_smp_cpuinfo(void)
+{
+ return "";
+}
+
+#endif /* !CONFIG_SMP */
/*
* ARC700 doesn't support atomic Read-Modify-Write ops.
diff --git a/arch/arc/kernel/setup.c b/arch/arc/kernel/setup.c
index 119dddb..da61f22 100644
--- a/arch/arc/kernel/setup.c
+++ b/arch/arc/kernel/setup.c
@@ -24,6 +24,7 @@
#include <asm/unwind.h>
#include <asm/clk.h>
#include <asm/mach_desc.h>
+#include <asm/smp.h>
#define FIX_PTR(x) __asm__ __volatile__(";" : "+r"(x))
@@ -306,10 +307,7 @@
arc_chk_ccms();
printk(arc_extn_mumbojumbo(cpu_id, str, sizeof(str)));
-
-#ifdef CONFIG_SMP
printk(arc_platform_smp_cpuinfo());
-#endif
arc_chk_fpu();
}
@@ -360,11 +358,7 @@
machine_desc->init_early();
setup_processor();
-
-#ifdef CONFIG_SMP
smp_init_cpus();
-#endif
-
setup_arch_memory();
/* copy flat DT out of .init and then unflatten it */
@@ -424,14 +418,9 @@
(loops_per_jiffy / (5000 / HZ)) % 100);
seq_printf(m, arc_mmu_mumbojumbo(cpu_id, str, PAGE_SIZE));
-
seq_printf(m, arc_cache_mumbojumbo(cpu_id, str, PAGE_SIZE));
-
seq_printf(m, arc_extn_mumbojumbo(cpu_id, str, PAGE_SIZE));
-
-#ifdef CONFIG_SMP
seq_printf(m, arc_platform_smp_cpuinfo());
-#endif
free_page((unsigned long)str);
done:
diff --git a/arch/arc/kernel/smp.c b/arch/arc/kernel/smp.c
index dcd317c..d01df0c 100644
--- a/arch/arc/kernel/smp.c
+++ b/arch/arc/kernel/smp.c
@@ -101,7 +101,7 @@
const char *arc_platform_smp_cpuinfo(void)
{
- return plat_smp_ops.info;
+ return plat_smp_ops.info ? : "";
}
/*
diff --git a/arch/arc/plat-arcfpga/Kconfig b/arch/arc/plat-arcfpga/Kconfig
index b9f34cf..4965f9f 100644
--- a/arch/arc/plat-arcfpga/Kconfig
+++ b/arch/arc/plat-arcfpga/Kconfig
@@ -8,7 +8,7 @@
menuconfig ARC_PLAT_FPGA_LEGACY
bool "\"Legacy\" ARC FPGA dev Boards"
- select ISS_SMP_EXTN if SMP
+ select ARC_HAS_COH_CACHES if SMP
help
Support for ARC development boards, provided by Synopsys.
These are based on FPGA or ISS. e.g.
diff --git a/arch/arc/plat-arcfpga/platform.c b/arch/arc/plat-arcfpga/platform.c
index 1038949..6abc341 100644
--- a/arch/arc/plat-arcfpga/platform.c
+++ b/arch/arc/plat-arcfpga/platform.c
@@ -71,7 +71,7 @@
.dt_compat = ml509_compat,
.init_early = plat_fpga_early_init,
.init_machine = plat_fpga_populate_dev,
-#ifdef CONFIG_SMP
+#ifdef CONFIG_ISS_SMP_EXTN
.init_smp = iss_model_init_smp,
#endif
MACHINE_END