diff options
| author | Nicholas Piggin <npiggin@gmail.com> | 2020-05-08 14:34:05 +1000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-05-19 00:10:34 +1000 |
| commit | abd106fb437ad1cd8c8df8ccabd0fa941ef6342a (patch) | |
| tree | cfa122e700d8609a592b2647576ee867ee8c3531 /arch | |
| parent | f2d7f62e4abdb03de3f4267361d96c417312d05c (diff) | |
powerpc/64s: machine check do not trace real-mode handler
Rather than notrace annotations throughout a significant part of the
machine check code across kernel/ pseries/ and powernv/ which can
easily be broken and is infrequently tested, use paca->ftrace_enabled
to blanket-disable tracing of the real-mode non-maskable handler.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Reviewed-by: Christophe Leroy <christophe.leroy@c-s.fr>
Acked-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Link: https://lore.kernel.org/r/20200508043408.886394-14-npiggin@gmail.com
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/kernel/mce.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/mce.c b/arch/powerpc/kernel/mce.c index be7e3f92a7b5..fd90c0eda229 100644 --- a/arch/powerpc/kernel/mce.c +++ b/arch/powerpc/kernel/mce.c @@ -16,6 +16,7 @@ #include <linux/export.h> #include <linux/irq_work.h> #include <linux/extable.h> +#include <linux/ftrace.h> #include <asm/machdep.h> #include <asm/mce.h> @@ -571,10 +572,14 @@ EXPORT_SYMBOL_GPL(machine_check_print_event_info); * * regs->nip and regs->msr contains srr0 and ssr1. */ -long machine_check_early(struct pt_regs *regs) +long notrace machine_check_early(struct pt_regs *regs) { long handled = 0; bool nested = in_nmi(); + u8 ftrace_enabled = this_cpu_get_ftrace_enabled(); + + this_cpu_set_ftrace_enabled(0); + if (!nested) nmi_enter(); @@ -589,6 +594,8 @@ long machine_check_early(struct pt_regs *regs) if (!nested) nmi_exit(); + this_cpu_set_ftrace_enabled(ftrace_enabled); + return handled; } |