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author | Vineet Gupta <vgupta@synopsys.com> | 2014-09-04 10:57:33 +0530 |
---|---|---|
committer | Vineet Gupta <vgupta@synopsys.com> | 2014-09-27 14:49:01 +0530 |
commit | 619f30188ff0d10fccc3cd952a79cb56ff62db54 (patch) | |
tree | 9bf015ba703fdd05d781b370792c0bba1f98d373 /arch | |
parent | 2ce7598c9a453e0acd0e07be7be3f5eb39608ebd (diff) | |
download | linux-619f30188ff0d10fccc3cd952a79cb56ff62db54.tar.gz linux-619f30188ff0d10fccc3cd952a79cb56ff62db54.tar.bz2 linux-619f30188ff0d10fccc3cd952a79cb56ff62db54.zip |
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>
Diffstat (limited to 'arch')
-rw-r--r-- | arch/arc/include/asm/smp.h | 10 | ||||
-rw-r--r-- | arch/arc/kernel/setup.c | 13 | ||||
-rw-r--r-- | arch/arc/kernel/smp.c | 2 | ||||
-rw-r--r-- | arch/arc/plat-arcfpga/Kconfig | 2 | ||||
-rw-r--r-- | arch/arc/plat-arcfpga/platform.c | 2 |
5 files changed, 13 insertions, 16 deletions
diff --git a/arch/arc/include/asm/smp.h b/arch/arc/include/asm/smp.h index 5d06eee43ea9..3845b9e94f69 100644 --- a/arch/arc/include/asm/smp.h +++ b/arch/arc/include/asm/smp.h @@ -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. diff --git a/arch/arc/kernel/setup.c b/arch/arc/kernel/setup.c index 119dddb752b2..da61f2205dc5 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 @@ 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: diff --git a/arch/arc/kernel/smp.c b/arch/arc/kernel/smp.c index dcd317c47d09..d01df0c517a2 100644 --- a/arch/arc/kernel/smp.c +++ b/arch/arc/kernel/smp.c @@ -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 ? : ""; } /* diff --git a/arch/arc/plat-arcfpga/Kconfig b/arch/arc/plat-arcfpga/Kconfig index b9f34cf55acf..4965f9f4ffdc 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 1038949a99a1..6abc341e276d 100644 --- a/arch/arc/plat-arcfpga/platform.c +++ b/arch/arc/plat-arcfpga/platform.c @@ -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 |