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vmlinux.lds.h: Add markers for text_unlikely and text_hot sections

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Add markers like __hot_text_start, __hot_text_end, __unlikely_text_start,
and __unlikely_text_end which will be included in System.map. These markers
indicate how the compiler groups functions, providing valuable information
to developers about the layout and optimization of the code.

Co-developed-by: Han Shen <shenhan@google.com>
Signed-off-by: Han Shen <shenhan@google.com>
Signed-off-by: Rong Xu <xur@google.com>
Suggested-by: Sriraman Tallam <tmsriram@google.com>
Tested-by: Yonghong Song <yonghong.song@linux.dev>
Tested-by: Yabin Cui <yabinc@google.com>
Tested-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Kees Cook <kees@kernel.org>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
This commit is contained in:
Rong Xu
2024-11-02 10:51:11 -07:00
committed by Masahiro Yamada
parent 0043ecea23
commit db0b2991ae
1 changed files with 12 additions and 2 deletions
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14
include/asm-generic/vmlinux.lds.h
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@@ -549,6 +549,16 @@
__cpuidle_text_end = .; \
__noinstr_text_end = .;
#define TEXT_UNLIKELY \
__unlikely_text_start = .; \
*(.text.unlikely .text.unlikely.*) \
__unlikely_text_end = .;
#define TEXT_HOT \
__hot_text_start = .; \
*(.text.hot .text.hot.*) \
__hot_text_end = .;
/*
* .text section. Map to function alignment to avoid address changes
* during second ld run in second ld pass when generating System.map
@@ -565,9 +575,9 @@
ALIGN_FUNCTION(); \
*(.text.asan.* .text.tsan.*) \
*(.text.unknown .text.unknown.*) \
*(.text.unlikely .text.unlikely.*) \
TEXT_UNLIKELY \
. = ALIGN(PAGE_SIZE); \
*(.text.hot .text.hot.*) \
TEXT_HOT \
*(TEXT_MAIN .text.fixup) \
NOINSTR_TEXT \
*(.ref.text)