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Linux Kernel Markers

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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 <mathieu.desnoyers@polymtl.ca>
Acked-by: "Frank Ch. Eigler" <fche@redhat.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Mike Mason <mmlnx@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mathieu Desnoyers 2007-10-18 23:41:06 -07:00 • committed by Linus Torvalds
parent 09cadedbdc
commit 8256e47cdc
7 changed files with 710 additions and 1 deletions
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30
kernel/module.c
View file

@ -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