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ARC: Allow SMP kernel to build/boot on UP-only infrastructure

Browse source 
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>
This commit is contained in:
Vineet Gupta 2014-09-04 10:57:33 +05:30
parent 2ce7598c9a
commit 619f30188f
5 changed files with 13 additions and 16 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

10
arch/arc/include/asm/smp.h
View file

@ -59,7 +59,15 @@ struct plat_smp_ops {
/* 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.

13
arch/arc/kernel/setup.c
View file

@ -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 @@ void setup_processor(void)
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 @@ void __init setup_arch(char **cmdline_p)
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 @@ static int show_cpuinfo(struct seq_file *m, void *v)
(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:

2
arch/arc/kernel/smp.c
View file

@ -101,7 +101,7 @@ void __weak arc_platform_smp_wait_to_boot(int cpu)
const char *arc_platform_smp_cpuinfo(void)
{
return plat_smp_ops.info;
return plat_smp_ops.info ? : "";
}
/*

2
arch/arc/plat-arcfpga/Kconfig
View file

@ -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.

2
arch/arc/plat-arcfpga/platform.c
View file

@ -71,7 +71,7 @@ MACHINE_START(ML509, "ml509")
.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