x86: fix SMP alternatives: use mutex instead of spinlock, text_poke is sleepable
text_poke is sleepable. The original fix by Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>. Signed-off-by: Pekka Paalanen <pq@iki.fi> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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@ -1,6 +1,6 @@
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#include <linux/module.h>
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#include <linux/sched.h>
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#include <linux/spinlock.h>
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#include <linux/mutex.h>
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#include <linux/list.h>
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#include <linux/kprobes.h>
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#include <linux/mm.h>
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@ -279,7 +279,7 @@ struct smp_alt_module {
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struct list_head next;
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};
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static LIST_HEAD(smp_alt_modules);
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static DEFINE_SPINLOCK(smp_alt);
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static DEFINE_MUTEX(smp_alt);
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static int smp_mode = 1; /* protected by smp_alt */
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void alternatives_smp_module_add(struct module *mod, char *name,
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@ -312,12 +312,12 @@ void alternatives_smp_module_add(struct module *mod, char *name,
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__func__, smp->locks, smp->locks_end,
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smp->text, smp->text_end, smp->name);
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spin_lock(&smp_alt);
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mutex_lock(&smp_alt);
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list_add_tail(&smp->next, &smp_alt_modules);
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if (boot_cpu_has(X86_FEATURE_UP))
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alternatives_smp_unlock(smp->locks, smp->locks_end,
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smp->text, smp->text_end);
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spin_unlock(&smp_alt);
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mutex_unlock(&smp_alt);
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}
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void alternatives_smp_module_del(struct module *mod)
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@ -327,17 +327,17 @@ void alternatives_smp_module_del(struct module *mod)
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if (smp_alt_once || noreplace_smp)
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return;
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spin_lock(&smp_alt);
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mutex_lock(&smp_alt);
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list_for_each_entry(item, &smp_alt_modules, next) {
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if (mod != item->mod)
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continue;
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list_del(&item->next);
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spin_unlock(&smp_alt);
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mutex_unlock(&smp_alt);
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DPRINTK("%s: %s\n", __func__, item->name);
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kfree(item);
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return;
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}
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spin_unlock(&smp_alt);
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mutex_unlock(&smp_alt);
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}
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void alternatives_smp_switch(int smp)
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@ -359,7 +359,7 @@ void alternatives_smp_switch(int smp)
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return;
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BUG_ON(!smp && (num_online_cpus() > 1));
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spin_lock(&smp_alt);
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mutex_lock(&smp_alt);
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/*
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* Avoid unnecessary switches because it forces JIT based VMs to
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@ -383,7 +383,7 @@ void alternatives_smp_switch(int smp)
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mod->text, mod->text_end);
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}
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smp_mode = smp;
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spin_unlock(&smp_alt);
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mutex_unlock(&smp_alt);
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}
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#endif
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