scripts/bloat-o-meter: ignore __noinstr_text_start

__noinstr_text_start is adding noise to the script, ignore it.

For instance using __always_inline on __skb_incr_checksum_unnecessary and
CC=clang build.

Before this patch, __noinstr_text_start can show up and confuse us.

$ scripts/bloat-o-meter -t vmlinux.old vmlinux.new
add/remove: 0/2 grow/shrink: 3/0 up/down: 212/-206 (6)
Function                                     old     new   delta
tcp6_gro_complete                            208     283     +75
tcp4_gro_complete                            376     449     +73
__noinstr_text_start                        3536    3600     +64
__pfx___skb_incr_checksum_unnecessary         32       -     -32
__skb_incr_checksum_unnecessary              174       -    -174
Total: Before=25509464, After=25509470, chg +0.00%

After this patch we have a more precise result.

$ scripts/bloat-o-meter -t vmlinux.old vmlinux.new
add/remove: 0/2 grow/shrink: 2/0 up/down: 148/-206 (-58)
Function                                     old     new   delta
tcp6_gro_complete                            208     283     +75
tcp4_gro_complete                            376     449     +73
__pfx___skb_incr_checksum_unnecessary         32       -     -32
__skb_incr_checksum_unnecessary              174       -    -174
Total: Before=25505928, After=25505870, chg -0.00%

Link: https://lkml.kernel.org/r/20260117083448.3877418-1-edumazet@google.com
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/scripts/bloat-o-meter b/scripts/bloat-o-meter
index 888ce286a351e6e324374396036de48777e2c50d..db5dd18dc2d58eff9ec028e2411a303aad07db38 100755 (executable)
--- a/scripts/bloat-o-meter
+++ b/scripts/bloat-o-meter
@@ -42,6 +42,7 @@ def getsizes(file, format):
                 if name.startswith("__se_sys"): continue
                 if name.startswith("__se_compat_sys"): continue
                 if name.startswith("__addressable_"): continue
+                if name.startswith("__noinstr_text_start"): continue
                 if name == "linux_banner": continue
                 if name == "vermagic": continue
                 # statics and some other optimizations adds random .NUMBER