linux-kernel - [PATCH 02/10] linker: add kflagstab section to vmlinux and modules

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Message-ID: <20250829105418.3053274-3-sidnayyar@google.com>
Date: Fri, 29 Aug 2025 10:54:10 +0000
From: Siddharth Nayyar <sidnayyar@...gle.com>
To: Nathan Chancellor <nathan@...nel.org>, Luis Chamberlain <mcgrof@...nel.org>, 
	Sami Tolvanen <samitolvanen@...gle.com>
Cc: Nicolas Schier <nicolas.schier@...ux.dev>, Petr Pavlu <petr.pavlu@...e.com>, 
	Arnd Bergmann <arnd@...db.de>, linux-kbuild@...r.kernel.org, linux-arch@...r.kernel.org, 
	linux-modules@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Siddharth Nayyar <sidnayyar@...gle.com>
Subject: [PATCH 02/10] linker: add kflagstab section to vmlinux and modules

This section will contain read-only kernel symbol flag values in the
form of a 8-bit bitset.

Signed-off-by: Siddharth Nayyar <sidnayyar@...gle.com>
---
 include/asm-generic/vmlinux.lds.h | 7 +++++++
 scripts/module.lds.S              | 1 +
 2 files changed, 8 insertions(+)

diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index ae2d2359b79e..310e2de56211 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -518,6 +518,13 @@ defined(CONFIG_AUTOFDO_CLANG) || defined(CONFIG_PROPELLER_CLANG)
 		__stop___kcrctab_gpl = .;				\
 	}								\
 									\
+	/* Kernel symbol flags table */					\
+	__kflagstab       : AT(ADDR(__kflagstab) - LOAD_OFFSET) {	\
+		__start___kflagstab = .;				\
+		KEEP(*(SORT(___kflagstab+*)))				\
+		__stop___kflagstab = .;					\
+	}								\
+									\
 	/* Kernel symbol table: strings */				\
         __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) {	\
 		*(__ksymtab_strings)					\
diff --git a/scripts/module.lds.S b/scripts/module.lds.S
index ee79c41059f3..9a8a3b6d1569 100644
--- a/scripts/module.lds.S
+++ b/scripts/module.lds.S
@@ -23,6 +23,7 @@ SECTIONS {
 	__ksymtab_gpl		0 : ALIGN(8) { *(SORT(___ksymtab_gpl+*)) }
 	__kcrctab		0 : ALIGN(4) { *(SORT(___kcrctab+*)) }
 	__kcrctab_gpl		0 : ALIGN(4) { *(SORT(___kcrctab_gpl+*)) }
+	__kflagstab		0 : ALIGN(1) { *(SORT(___kflagstab+*)) }
 
 	.ctors			0 : ALIGN(8) { *(SORT(.ctors.*)) *(.ctors) }
 	.init_array		0 : ALIGN(8) { *(SORT(.init_array.*)) *(.init_array) }
-- 
2.51.0.338.gd7d06c2dae-goog