From 8256e47cdc8923e9959eb1d7f95d80da538add80 Mon Sep 17 00:00:00 2001 From: Mathieu Desnoyers Date: Thu, 18 Oct 2007 23:41:06 -0700 Subject: Linux Kernel Markers The marker activation functions sits in kernel/marker.c. A hash table is used to keep track of the registered probes and armed markers, so the markers within a newly loaded module that should be active can be activated at module load time. marker_query has been removed. marker_get_first, marker_get_next and marker_release should be used as iterators on the markers. [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Mathieu Desnoyers Acked-by: "Frank Ch. Eigler" Cc: Christoph Hellwig Cc: Rusty Russell Cc: Mike Mason Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- kernel/module.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) (limited to 'kernel/module.c') diff --git a/kernel/module.c b/kernel/module.c index 7734595bd329..3202c9950073 100644 --- a/kernel/module.c +++ b/kernel/module.c @@ -1673,6 +1673,8 @@ static struct module *load_module(void __user *umod, unsigned int unusedcrcindex; unsigned int unusedgplindex; unsigned int unusedgplcrcindex; + unsigned int markersindex; + unsigned int markersstringsindex; struct module *mod; long err = 0; void *percpu = NULL, *ptr = NULL; /* Stops spurious gcc warning */ @@ -1939,6 +1941,9 @@ static struct module *load_module(void __user *umod, add_taint_module(mod, TAINT_FORCED_MODULE); } #endif + markersindex = find_sec(hdr, sechdrs, secstrings, "__markers"); + markersstringsindex = find_sec(hdr, sechdrs, secstrings, + "__markers_strings"); /* Now do relocations. */ for (i = 1; i < hdr->e_shnum; i++) { @@ -1961,6 +1966,11 @@ static struct module *load_module(void __user *umod, if (err < 0) goto cleanup; } +#ifdef CONFIG_MARKERS + mod->markers = (void *)sechdrs[markersindex].sh_addr; + mod->num_markers = + sechdrs[markersindex].sh_size / sizeof(*mod->markers); +#endif /* Find duplicate symbols */ err = verify_export_symbols(mod); @@ -1979,6 +1989,11 @@ static struct module *load_module(void __user *umod, add_kallsyms(mod, sechdrs, symindex, strindex, secstrings); +#ifdef CONFIG_MARKERS + if (!mod->taints) + marker_update_probe_range(mod->markers, + mod->markers + mod->num_markers, NULL, NULL); +#endif err = module_finalize(hdr, sechdrs, mod); if (err < 0) goto cleanup; @@ -2570,3 +2585,18 @@ EXPORT_SYMBOL(module_remove_driver); void struct_module(struct module *mod) { return; } EXPORT_SYMBOL(struct_module); #endif + +#ifdef CONFIG_MARKERS +void module_update_markers(struct module *probe_module, int *refcount) +{ + struct module *mod; + + mutex_lock(&module_mutex); + list_for_each_entry(mod, &modules, list) + if (!mod->taints) + marker_update_probe_range(mod->markers, + mod->markers + mod->num_markers, + probe_module, refcount); + mutex_unlock(&module_mutex); +} +#endif -- cgit v1.2.3-59-g8ed1b