sprint_symbol(): use less stack
sprint_symbol(), itself used when dumping stacks, has been wasting 128
bytes of stack: lookup the symbol directly into the buffer supplied by the
caller, instead of using a locally declared namebuf.
I believe the name != buffer strcpy() is obsolete: the design here dates
from when module symbol lookup pointed into a supposedly const but sadly
volatile table; nowadays it copies, but an uncalled strcpy() looks better
here than the risk of a recursive BUG_ON().
Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/kernel/kallsyms.c b/kernel/kallsyms.c
index 5072cf1..7b8b0f2 100644
--- a/kernel/kallsyms.c
+++ b/kernel/kallsyms.c
@@ -304,17 +304,24 @@
char *modname;
const char *name;
unsigned long offset, size;
- char namebuf[KSYM_NAME_LEN];
+ int len;
- name = kallsyms_lookup(address, &size, &offset, &modname, namebuf);
+ name = kallsyms_lookup(address, &size, &offset, &modname, buffer);
if (!name)
return sprintf(buffer, "0x%lx", address);
+ if (name != buffer)
+ strcpy(buffer, name);
+ len = strlen(buffer);
+ buffer += len;
+
if (modname)
- return sprintf(buffer, "%s+%#lx/%#lx [%s]", name, offset,
- size, modname);
+ len += sprintf(buffer, "+%#lx/%#lx [%s]",
+ offset, size, modname);
else
- return sprintf(buffer, "%s+%#lx/%#lx", name, offset, size);
+ len += sprintf(buffer, "+%#lx/%#lx", offset, size);
+
+ return len;
}
/* Look up a kernel symbol and print it to the kernel messages. */
