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| author | Borislav Petkov <bp@suse.de> | 2021-10-13 10:07:19 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-01-27 13:04:39 +0300 |
| commit | f2bde2aeb1aea77b56d151b293a03cd5b1a19d07 (patch) | |
| tree | c4b1f38797836dd22c75286e72932c2a71a5877d /arch/x86/kernel/cpu/mce/core.c | |
| parent | 3903e62795309c8cd041191f506941aa3fe2c548 (diff) | |
| download | linux-f2bde2aeb1aea77b56d151b293a03cd5b1a19d07.tar.xz | |
x86/mce: Allow instrumentation during task work queueing
[ Upstream commit 4fbce464db81a42f9a57ee242d6150ec7f996415 ]
Fixes
vmlinux.o: warning: objtool: do_machine_check()+0xdb1: call to queue_task_work() leaves .noinstr.text section
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lore.kernel.org/r/20211208111343.8130-6-bp@alien8.de
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'arch/x86/kernel/cpu/mce/core.c')
| -rw-r--r-- | arch/x86/kernel/cpu/mce/core.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/mce/core.c b/arch/x86/kernel/cpu/mce/core.c index 193204aee880..c8d121085c8f 100644 --- a/arch/x86/kernel/cpu/mce/core.c +++ b/arch/x86/kernel/cpu/mce/core.c @@ -1454,6 +1454,14 @@ noinstr void do_machine_check(struct pt_regs *regs) if (worst != MCE_AR_SEVERITY && !kill_current_task) goto out; + /* + * Enable instrumentation around the external facilities like + * task_work_add() (via queue_task_work()), fixup_exception() etc. + * For now, that is. Fixing this properly would need a lot more involved + * reorganization. + */ + instrumentation_begin(); + /* Fault was in user mode and we need to take some action */ if ((m.cs & 3) == 3) { /* If this triggers there is no way to recover. Die hard. */ @@ -1479,6 +1487,9 @@ noinstr void do_machine_check(struct pt_regs *regs) if (m.kflags & MCE_IN_KERNEL_COPYIN) queue_task_work(&m, msg, kill_current_task); } + + instrumentation_end(); + out: mce_wrmsrl(MSR_IA32_MCG_STATUS, 0); } |