btfdiff: Add utility to compare pahole output produced from DWARF and BTF
$ btfdiff
Usage: btfdiff <filename_with_BTF_and_DWARF_info>
$ btfdiff ~/git/build/v4.20-rc5+/net/ipv4/tcp.o
--- /tmp/btfdiff.LRlcgc 2019-01-11 13:55:16.808989679 -0300
+++ /tmp/btfdiff.SHuCev 2019-01-11 13:55:16.819989781 -0300
@@ -585,11 +585,17 @@
__u16 vesapm_off; /* 48 2 */
__u16 pages; /* 50 2 */
__u16 vesa_attributes; /* 52 2 */
- __u32 capabilities; /* 54 4 */
- __u32 ext_lfb_base; /* 58 4 */
+ __u32 capabilities; /* 52 4 */
+ __u32 ext_lfb_base; /* 56 4 */
+
+ /* XXX 2 bytes hole, try to pack */
+
__u8 _reserved[2]; /* 62 2 */
/* size: 64, cachelines: 1, members: 36 */
+ /* sum members: 60, holes: 1, sum holes: 2 */
+
+ /* BRAIN FART ALERT! 64 != 60 + 2(holes), diff = 2 */
};
struct apm_bios_info {
__u16 version; /* 0 2 */
<SNIP>
$
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
1 file changed
