[PATCH v0 04/12] x86/mce: Remove noinstr annotation from mce_setup()

Borislav Petkov
2021-11-04T14:40:59Z

Instead, sandwitch around the call which is done in noinstr context and
mark the caller - mce_gather_info() - as noinstr.

Signed-off-by: Borislav Petkov <bp@suse.de>
---
arch/x86/kernel/cpu/mce/core.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/cpu/mce/core.c b/arch/x86/kernel/cpu/mce/core.c
index c660008ccd4a..c7181e8e2845 100644
--- a/arch/x86/kernel/cpu/mce/core.c
+++ b/arch/x86/kernel/cpu/mce/core.c
@@ -128,7 +128,7 @@ static struct irq_work mce_irq_work;
BLOCKING_NOTIFIER_HEAD(x86_mce_decoder_chain);

/* Do initial initialization of a struct mce */
-noinstr void mce_setup(struct mce *m)
+void mce_setup(struct mce *m)
{
memset(m, 0, sizeof(struct mce));
m->cpu = m->extcpu = smp_processor_id();
@@ -433,9 +433,11 @@ static noinstr void mce_wrmsrl(u32 msr, u64 v)
* check into our "mce" struct so that we can use it later to assess
* the severity of the problem as we read per-bank specific details.
*/
-static inline void mce_gather_info(struct mce *m, struct pt_regs *regs)
+static noinstr void mce_gather_info(struct mce *m, struct pt_regs *regs)
{
+ instrumentation_begin();
mce_setup(m);
+ instrumentation_end();

m->mcgstatus = mce_rdmsrl(MSR_IA32_MCG_STATUS);
if (regs) {
--
2.29.2