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authorHugh Dickins <hugh@veritas.com>2008-11-19 15:36:36 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2008-11-19 18:49:58 -0800
commit966c8c12dc9e77f931e2281ba25d2f0244b06949 (patch)
tree8914c842252f6872cca006b482d32ee7a12da808
parent3fa59dfbc3b223f02c26593be69ce6fc9a940405 (diff)
downloadop-kernel-dev-966c8c12dc9e77f931e2281ba25d2f0244b06949.zip
op-kernel-dev-966c8c12dc9e77f931e2281ba25d2f0244b06949.tar.gz
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 I believe the name != buffer strcpy() is obsolete: the design here dates from when module symbol lookup pointed into a supposedly const but sadly volatile table; nowadays it copies, but an uncalled strcpy()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>
-rw-r--r--kernel/kallsyms.c17
1 files changed, 12 insertions, 5 deletions
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 @@ int sprint_symbol(char *buffer, unsigned long address)
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. */
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