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x86: make x86_64 accept the max_cpus parameter 

The parameter passing parsing is done in the common smpboot.c

Signed-off-by: Glauber Costa <gcosta@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Glauber Costa 2008-03-03 14:13:08 -03:00 committed by Ingo Molnar
parent 69c18c15d3
commit 89b08200ad
3 changed files with 19 additions and 13 deletions
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7
arch/x86/kernel/mpparse_64.c
View File

@ -32,6 +32,7 @@
/* Have we found an MP table */ /* Have we found an MP table */
int smp_found_config; int smp_found_config;
unsigned int __cpuinitdata maxcpus = NR_CPUS;
/* /*
* Various Linux-internal data structures created from the * Various Linux-internal data structures created from the
@ -115,6 +116,12 @@ static void __cpuinit MP_processor_info(struct mpc_config_processor *m)
return; return;
} }
if (num_processors >= maxcpus) {
printk(KERN_WARNING "WARNING: maxcpus limit of %i reached."
" Processor ignored.\n", maxcpus);
return;
}
num_processors++; num_processors++;
cpus_complement(tmp_map, cpu_present_map); cpus_complement(tmp_map, cpu_present_map);
cpu = first_cpu(tmp_map); cpu = first_cpu(tmp_map);

12
arch/x86/kernel/smpboot.c
View File

@ -268,3 +268,15 @@ void __cpu_die(unsigned int cpu)
} }
#endif #endif
/*
* If the BIOS enumerates physical processors before logical,
* maxcpus=N at enumeration-time can be used to disable HT.
*/
static int __init parse_maxcpus(char *arg)
{
extern unsigned int maxcpus;
maxcpus = simple_strtoul(arg, NULL, 0);
return 0;
}
early_param("maxcpus", parse_maxcpus);

13
arch/x86/kernel/smpboot_32.c
View File

@ -1113,16 +1113,3 @@ void __init smp_intr_init(void)
/* IPI for generic function call */ /* IPI for generic function call */
set_intr_gate(CALL_FUNCTION_VECTOR, call_function_interrupt); set_intr_gate(CALL_FUNCTION_VECTOR, call_function_interrupt);
} }
/*
* If the BIOS enumerates physical processors before logical,
* maxcpus=N at enumeration-time can be used to disable HT.
*/
static int __init parse_maxcpus(char *arg)
{
extern unsigned int maxcpus;
maxcpus = simple_strtoul(arg, NULL, 0);
return 0;
}
early_param("maxcpus", parse_maxcpus);