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x86/microcode/intel: Remove pointless mutex

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There is no concurrency.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20230812195728.069849788@linutronix.de
This commit is contained in:
Thomas Gleixner 2023-08-12 21:58:50 +02:00 • committed by Borislav Petkov (AMD)
parent d44450c593
commit d2700f4067
1 changed files with 2 additions and 22 deletions
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24
arch/x86/kernel/cpu/microcode/intel.c
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@ -397,22 +397,6 @@ next:
return patch;
}
/*
* Save this microcode patch. It will be loaded early when a CPU is
* hot-added or resumes.
*/
static void save_mc_for_early(struct ucode_cpu_info *uci, u8 *mc, unsigned int size)
{
/* Synchronization during CPU hotplug. */
static DEFINE_MUTEX(x86_cpu_microcode_mutex);
mutex_lock(&x86_cpu_microcode_mutex);
save_microcode_patch(uci, mc, size);
mutex_unlock(&x86_cpu_microcode_mutex);
}
static bool load_builtin_intel_microcode(struct cpio_data *cp)
{
unsigned int eax = 1, ebx, ecx = 0, edx;
@ -829,12 +813,8 @@ static enum ucode_state generic_load_microcode(int cpu, struct iov_iter *iter)
vfree(uci->mc);
uci->mc = (struct microcode_intel *)new_mc;
/*
* If early loading microcode is supported, save this mc into
* permanent memory. So it will be loaded early when a CPU is hot added
* or resumes.
*/
save_mc_for_early(uci, new_mc, new_mc_size);
/* Save for CPU hotplug */
save_microcode_patch(uci, new_mc, new_mc_size);
pr_debug("CPU%d found a matching microcode update with version 0x%x (current=0x%x)\n",
cpu, new_rev, uci->cpu_sig.rev);