Commit 10d59752 authored by Borislav Petkov's avatar Borislav Petkov Committed by Thadeu Lima de Souza Cascardo

x86/oprofile/ppro: Do not use __this_cpu*() in preemptible context

BugLink: http://bugs.launchpad.net/bugs/1732698

commit a743bbee upstream.

The warning below says it all:

  BUG: using __this_cpu_read() in preemptible [00000000] code: swapper/0/1
  caller is __this_cpu_preempt_check
  CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.14.0-rc8 #4
  Call Trace:
   dump_stack
   check_preemption_disabled
   ? do_early_param
   __this_cpu_preempt_check
   arch_perfmon_init
   op_nmi_init
   ? alloc_pci_root_info
   oprofile_arch_init
   oprofile_init
   do_one_initcall
   ...

These accessors should not have been used in the first place: it is PPro so
no mixed silicon revisions and thus it can simply use boot_cpu_data.
Reported-by: default avatarFengguang Wu <fengguang.wu@intel.com>
Tested-by: default avatarFengguang Wu <fengguang.wu@intel.com>
Fix-creation-mandated-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Cc: Robert Richter <rric@kernel.org>
Cc: x86@kernel.org
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: default avatarStefan Bader <stefan.bader@canonical.com>
Signed-off-by: default avatarThadeu Lima de Souza Cascardo <cascardo@canonical.com>
parent e929b957
......@@ -212,8 +212,8 @@ static void arch_perfmon_setup_counters(void)
eax.full = cpuid_eax(0xa);
/* Workaround for BIOS bugs in 6/15. Taken from perfmon2 */
if (eax.split.version_id == 0 && __this_cpu_read(cpu_info.x86) == 6 &&
__this_cpu_read(cpu_info.x86_model) == 15) {
if (eax.split.version_id == 0 && boot_cpu_data.x86 == 6 &&
boot_cpu_data.x86_model == 15) {
eax.split.version_id = 2;
eax.split.num_counters = 2;
eax.split.bit_width = 40;
......
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