linux-kernel - [PATCH 1/2] asm-generic: export: Stub EXPORT_SYMBOL with __DISABLE

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Date:   Wed,  3 Feb 2021 14:19:30 +0000
From:   Quentin Perret <qperret@...gle.com>
To:     arnd@...db.de, maz@...nel.org, catalin.marinas@....com,
        will@...nel.org
Cc:     james.morse@....com, julien.thierry.kdev@...il.com,
        suzuki.poulose@....com, ardb@...nel.org,
        linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        kernel-team@...roid.com, qperret@...gle.com
Subject: [PATCH 1/2] asm-generic: export: Stub EXPORT_SYMBOL with __DISABLE_EXPORTS

It is currently possible to stub EXPORT_SYMBOL() macros in C code using
__DISABLE_EXPORTS, which is necessary to run in constrained environments
such as the EFI stub or the decompressor. But this currently doesn't
apply to exports from assembly, which can lead to somewhat confusing
situations.

Consolidate the __DISABLE_EXPORTS infrastructure by checking it from
asm-generic/export.h as well.

Signed-off-by: Quentin Perret <qperret@...gle.com>
---
 include/asm-generic/export.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/asm-generic/export.h b/include/asm-generic/export.h
index 365345f9a9e3..07a36a874dca 100644
--- a/include/asm-generic/export.h
+++ b/include/asm-generic/export.h
@@ -33,7 +33,7 @@
  */
 
 .macro ___EXPORT_SYMBOL name,val,sec
-#ifdef CONFIG_MODULES
+#if defined(CONFIG_MODULES) && !defined(__DISABLE_EXPORTS)
 	.section ___ksymtab\sec+\name,"a"
 	.balign KSYM_ALIGN
 __ksymtab_\name:
-- 
2.30.0.365.g02bc693789-goog