diff options
Diffstat (limited to '0001-redhat-rh_kabi-deduplication-friendly-structs.patch')
| -rw-r--r-- | 0001-redhat-rh_kabi-deduplication-friendly-structs.patch | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/0001-redhat-rh_kabi-deduplication-friendly-structs.patch b/0001-redhat-rh_kabi-deduplication-friendly-structs.patch new file mode 100644 index 000000000..1e1edd71e --- /dev/null +++ b/0001-redhat-rh_kabi-deduplication-friendly-structs.patch @@ -0,0 +1,65 @@ +From 712d5caafb841524ec3a5e9499e5ab9f4818d9ca Mon Sep 17 00:00:00 2001 +From: Jiri Benc <jbenc@redhat.com> +Date: Wed, 19 Feb 2020 11:52:21 +0100 +Subject: [PATCH] redhat: rh_kabi: deduplication friendly structs +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +RH-Acked-by: Bruno Meneguele <bmeneg@redhat.com> +RH-Acked-by: Jesper Brouer <brouer@redhat.com> +RH-Acked-by: Prarit Bhargava <prarit@redhat.com> +RH-Acked-by: Jiri Olsa <jolsa@redhat.com> +RH-Acked-by: Toke Høiland-Jørgensen <toke@redhat.com> + +Upstream status: RHEL only + +We don't really need the field names to be globally unique, it is enough +when they are unique in the given struct. Since structs do not generally +span mutliple files, using the line number is enough to ensure an unique +identifier. It means that we can't use two RH_KABI_RENAME macros on the same +line but that's not happening anyway. + +This allows pahole to deduplicate the type info of structs using kABI +macros, lowering the size of vmlinuz from 26M to 8.5M. + +Upstream Status: RHEL only +Signed-off-by: Jiri Benc <jbenc@redhat.com> +--- + include/linux/rh_kabi.h | 6 ++++-- + 1 file changed, 4 insertions(+), 2 deletions(-) + +diff --git a/include/linux/rh_kabi.h b/include/linux/rh_kabi.h +index b90601e8a657..ea9c136bf884 100644 +--- a/include/linux/rh_kabi.h ++++ b/include/linux/rh_kabi.h +@@ -163,6 +163,8 @@ + # define __RH_KABI_CHECK_SIZE(_item, _size) + #endif + ++#define RH_KABI_UNIQUE_ID __PASTE(rh_kabi_hidden_, __LINE__) ++ + # define _RH_KABI_DEPRECATE(_type, _orig) _type rh_reserved_##_orig + # define _RH_KABI_DEPRECATE_FN(_type, _orig, _args...) \ + _type (* rh_reserved_##_orig)(_args) +@@ -171,7 +173,7 @@ + _new; \ + struct { \ + _orig; \ +- } __UNIQUE_ID(rh_kabi_hide); \ ++ } RH_KABI_UNIQUE_ID; \ + __RH_KABI_CHECK_SIZE_ALIGN(_orig, _new); \ + } + # define _RH_KABI_REPLACE_UNSAFE(_orig, _new) _new +@@ -218,7 +220,7 @@ + #define RH_KABI_EXTEND_WITH_SIZE(_new, _size) \ + RH_KABI_EXTEND(union { \ + _new; \ +- unsigned long __UNIQUE_ID(rh_kabi_reserved)[_size]; \ ++ unsigned long RH_KABI_UNIQUE_ID[_size]; \ + __RH_KABI_CHECK_SIZE(_new, 8 * (_size)); \ + }) + +-- +2.26.0 + |