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[PATCH] powerpc64: remove broken/bitrotted HMT support

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HMT support is currently broken and needs to be reworked to play nicely
with the SMT scheduler. Remove the bit rotten bits for the time being.

I also updated an incorrect comment, we enter __secondary_hold with the
physical cpu id in r3.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Anton Blanchard
2006-02-13 18:11:13 +11:00
committed by Paul Mackerras
parent cb2c9b2741
commit f1870f772c
3 changed files with 4 additions and 138 deletions
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38
arch/powerpc/kernel/prom_init.c
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@ -205,14 +205,6 @@ static cell_t __initdata regbuf[1024];
#define MAX_CPU_THREADS 2
/* TO GO */
#ifdef CONFIG_HMT
struct {
unsigned int pir;
unsigned int threadid;
} hmt_thread_data[NR_CPUS];
#endif /* CONFIG_HMT */
/*
* Error results ... some OF calls will return "-1" on error, some
* will return 0, some will return either. To simplify, here are
@ -1319,10 +1311,6 @@ static void __init prom_hold_cpus(void)
*/
*spinloop = 0;
#ifdef CONFIG_HMT
for (i = 0; i < NR_CPUS; i++)
RELOC(hmt_thread_data)[i].pir = 0xdeadbeef;
#endif
/* look for cpus */
for (node = 0; prom_next_node(&node); ) {
type[0] = 0;
@ -1389,32 +1377,6 @@ static void __init prom_hold_cpus(void)
/* Reserve cpu #s for secondary threads. They start later. */
cpuid += cpu_threads;
}
#ifdef CONFIG_HMT
/* Only enable HMT on processors that provide support. */
if (__is_processor(PV_PULSAR) ||
__is_processor(PV_ICESTAR) ||
__is_processor(PV_SSTAR)) {
prom_printf(" starting secondary threads\n");
for (i = 0; i < NR_CPUS; i += 2) {
if (!cpu_online(i))
continue;
if (i == 0) {
unsigned long pir = mfspr(SPRN_PIR);
if (__is_processor(PV_PULSAR)) {
RELOC(hmt_thread_data)[i].pir =
pir & 0x1f;
} else {
RELOC(hmt_thread_data)[i].pir =
pir & 0x3ff;
}
}
}
} else {
prom_printf("Processor is not HMT capable\n");
}
#endif
if (cpuid > NR_CPUS)
prom_printf("WARNING: maximum CPUs (" __stringify(NR_CPUS)