#include <linux/kallsyms.h>
#include <wrapper/kallsyms.h>
+#include <lttng-kernel-version.h>
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,8,0))
+
+/*
+ * wrapper_vmalloc_sync_mappings was removed in v5.8, the vmalloc mappings
+ * are now synchronized when they are created or torn down.
+ */
+static inline
+void wrapper_vmalloc_sync_mappings(void)
+{}
+
+#elif (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0) \
+ || LTTNG_KERNEL_RANGE(5,5,12, 5,6,0) \
+ || LTTNG_KERNEL_RANGE(5,4,28, 5,5,0) \
+ || LTTNG_KERNEL_RANGE(5,2,37, 5,3,0) \
+ || LTTNG_KERNEL_RANGE(4,19,113, 4,20,0) \
+ || LTTNG_KERNEL_RANGE(4,14,175, 4,15,0) \
+ || LTTNG_KERNEL_RANGE(4,9,218, 4,10,0) \
+ || LTTNG_KERNEL_RANGE(4,4,218, 4,5,0)) \
+ || LTTNG_UBUNTU_KERNEL_RANGE(4,15,18,97, 4,16,0,0) \
+ || LTTNG_UBUNTU_KERNEL_RANGE(5,0,21,48, 5,1,0,0) \
+ || LTTNG_UBUNTU_KERNEL_RANGE(5,3,18,52, 5,4,0,0)
+
+static inline
+void wrapper_vmalloc_sync_mappings(void)
+{
+ void (*vmalloc_sync_mappings_sym)(void);
+
+ vmalloc_sync_mappings_sym = (void *) kallsyms_lookup_funcptr("vmalloc_sync_mappings");
+ if (vmalloc_sync_mappings_sym) {
+ vmalloc_sync_mappings_sym();
+ } else {
+#ifdef CONFIG_X86
+ /*
+ * Only x86 needs vmalloc_sync_mappings to make sure LTTng does not
+ * trigger recursive page faults.
+ */
+ printk_once(KERN_WARNING "LTTng: vmalloc_sync_mappings symbol lookup failed.\n");
+ printk_once(KERN_WARNING "Page fault handler and NMI tracing might trigger faults.\n");
+#endif
+ }
+}
+
+#else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) */
+
+/*
+ * Map vmalloc_sync_mappings to vmalloc_sync_all() on kernels before 5.7.
+ */
static inline
-void wrapper_vmalloc_sync_all(void)
+void wrapper_vmalloc_sync_mappings(void)
{
void (*vmalloc_sync_all_sym)(void);
#endif
}
}
+
+#endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) */
+
#else
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0) \
+ || LTTNG_KERNEL_RANGE(5,5,12, 5,6,0) \
+ || LTTNG_KERNEL_RANGE(5,4,28, 5,5,0) \
+ || LTTNG_KERNEL_RANGE(5,2,37, 5,3,0) \
+ || LTTNG_KERNEL_RANGE(4,19,113, 4,20,0) \
+ || LTTNG_KERNEL_RANGE(4,14,175, 4,15,0) \
+ || LTTNG_KERNEL_RANGE(4,9,218, 4,10,0) \
+ || LTTNG_KERNEL_RANGE(4,4,218, 4,5,0)) \
+ || LTTNG_UBUNTU_KERNEL_RANGE(4,15,18,97, 4,18,0,0) \
+ || LTTNG_UBUNTU_KERNEL_RANGE(5,0,21,48, 5,1,0,0) \
+ || LTTNG_UBUNTU_KERNEL_RANGE(5,3,18,52, 5,4,0,0)
+
+static inline
+void wrapper_vmalloc_sync_mappings(void)
+{
+ return vmalloc_sync_mappings();
+}
+
+#else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) */
+
static inline
-void wrapper_vmalloc_sync_all(void)
+void wrapper_vmalloc_sync_mappings(void)
{
return vmalloc_sync_all();
}
+
+#endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) */
+
#endif
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,12,0))
* Make sure we don't trigger recursive page faults in the
* tracing fast path.
*/
- wrapper_vmalloc_sync_all();
+ wrapper_vmalloc_sync_mappings();
}
return ret;
}
* Make sure we don't trigger recursive page faults in the
* tracing fast path.
*/
- wrapper_vmalloc_sync_all();
+ wrapper_vmalloc_sync_mappings();
}
return ret;
}