diff options
| author | Jani Nikula <jani.nikula@intel.com> | 2017-10-18 12:37:31 +0300 |
|---|---|---|
| committer | Jani Nikula <jani.nikula@intel.com> | 2017-10-18 12:37:31 +0300 |
| commit | 526b96c4f8dceb0104e267c61e5a3b22c538570c (patch) | |
| tree | 8825258c4f678f5ad9fddc0afaf72d640458481a /kernel/extable.c | |
| parent | cb8d50dfb341e9615c8d203a3e6513dae9ff901d (diff) | |
| parent | 40d86701a625eed9e644281b9af228d6a52d8ed9 (diff) | |
Merge drm-upstream/drm-next into drm-intel-next-queued
Needed for timer_setup() and drm_dev_{get,put}() conversions in i915.
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Diffstat (limited to 'kernel/extable.c')
| -rw-r--r-- | kernel/extable.c | 45 |
1 files changed, 31 insertions, 14 deletions
diff --git a/kernel/extable.c b/kernel/extable.c index 38c2412401a1..9aa1cc41ecf7 100644 --- a/kernel/extable.c +++ b/kernel/extable.c @@ -102,15 +102,7 @@ int core_kernel_data(unsigned long addr) int __kernel_text_address(unsigned long addr) { - if (core_kernel_text(addr)) - return 1; - if (is_module_text_address(addr)) - return 1; - if (is_ftrace_trampoline(addr)) - return 1; - if (is_kprobe_optinsn_slot(addr) || is_kprobe_insn_slot(addr)) - return 1; - if (is_bpf_text_address(addr)) + if (kernel_text_address(addr)) return 1; /* * There might be init symbols in saved stacktraces. @@ -127,17 +119,42 @@ int __kernel_text_address(unsigned long addr) int kernel_text_address(unsigned long addr) { + bool no_rcu; + int ret = 1; + if (core_kernel_text(addr)) return 1; + + /* + * If a stack dump happens while RCU is not watching, then + * RCU needs to be notified that it requires to start + * watching again. This can happen either by tracing that + * triggers a stack trace, or a WARN() that happens during + * coming back from idle, or cpu on or offlining. + * + * is_module_text_address() as well as the kprobe slots + * and is_bpf_text_address() require RCU to be watching. + */ + no_rcu = !rcu_is_watching(); + + /* Treat this like an NMI as it can happen anywhere */ + if (no_rcu) + rcu_nmi_enter(); + if (is_module_text_address(addr)) - return 1; + goto out; if (is_ftrace_trampoline(addr)) - return 1; + goto out; if (is_kprobe_optinsn_slot(addr) || is_kprobe_insn_slot(addr)) - return 1; + goto out; if (is_bpf_text_address(addr)) - return 1; - return 0; + goto out; + ret = 0; +out: + if (no_rcu) + rcu_nmi_exit(); + + return ret; } /* |