2020-04-29 21:12:02 +00:00
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From 91c23fffe0d253ad886fc37ea48699da4d8a8b57 Mon Sep 17 00:00:00 2001
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2020-04-23 20:47:21 +00:00
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From: Jiri Benc <jbenc@redhat.com>
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Date: Wed, 19 Feb 2020 11:52:21 +0100
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Subject: [PATCH] redhat: rh_kabi: deduplication friendly structs
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Acked-by: Bruno Meneguele <bmeneg@redhat.com>
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RH-Acked-by: Jesper Brouer <brouer@redhat.com>
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RH-Acked-by: Prarit Bhargava <prarit@redhat.com>
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RH-Acked-by: Jiri Olsa <jolsa@redhat.com>
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RH-Acked-by: Toke Høiland-Jørgensen <toke@redhat.com>
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Upstream status: RHEL only
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We don't really need the field names to be globally unique, it is enough
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when they are unique in the given struct. Since structs do not generally
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span mutliple files, using the line number is enough to ensure an unique
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identifier. It means that we can't use two RH_KABI_RENAME macros on the same
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line but that's not happening anyway.
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This allows pahole to deduplicate the type info of structs using kABI
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macros, lowering the size of vmlinuz from 26M to 8.5M.
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Upstream Status: RHEL only
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Signed-off-by: Jiri Benc <jbenc@redhat.com>
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---
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include/linux/rh_kabi.h | 6 ++++--
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1 file changed, 4 insertions(+), 2 deletions(-)
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diff --git a/include/linux/rh_kabi.h b/include/linux/rh_kabi.h
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index b90601e8a657..ea9c136bf884 100644
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--- a/include/linux/rh_kabi.h
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+++ b/include/linux/rh_kabi.h
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@@ -163,6 +163,8 @@
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# define __RH_KABI_CHECK_SIZE(_item, _size)
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#endif
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2020-04-27 02:15:20 +00:00
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2020-04-23 20:47:21 +00:00
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+#define RH_KABI_UNIQUE_ID __PASTE(rh_kabi_hidden_, __LINE__)
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+
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# define _RH_KABI_DEPRECATE(_type, _orig) _type rh_reserved_##_orig
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# define _RH_KABI_DEPRECATE_FN(_type, _orig, _args...) \
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_type (* rh_reserved_##_orig)(_args)
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@@ -171,7 +173,7 @@
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_new; \
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struct { \
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_orig; \
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- } __UNIQUE_ID(rh_kabi_hide); \
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+ } RH_KABI_UNIQUE_ID; \
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__RH_KABI_CHECK_SIZE_ALIGN(_orig, _new); \
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}
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# define _RH_KABI_REPLACE_UNSAFE(_orig, _new) _new
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@@ -218,7 +220,7 @@
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#define RH_KABI_EXTEND_WITH_SIZE(_new, _size) \
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RH_KABI_EXTEND(union { \
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_new; \
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- unsigned long __UNIQUE_ID(rh_kabi_reserved)[_size]; \
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+ unsigned long RH_KABI_UNIQUE_ID[_size]; \
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__RH_KABI_CHECK_SIZE(_new, 8 * (_size)); \
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})
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2020-04-27 02:15:20 +00:00
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2020-04-23 20:47:21 +00:00
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--
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2020-04-27 02:15:20 +00:00
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2.26.2
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2020-04-23 20:47:21 +00:00
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