+ riscv-export-symbols-needed-for-riscv32-efi-stub.patch added to mm-nonmm-unstable branch

+ riscv-export-symbols-needed-for-riscv32-efi-stub.patch added to mm-nonmm-unstable branch

[Andrew Morton]

The patch titled
     Subject: riscv: export symbols needed for riscv32 EFI stub
has been added to the -mm mm-nonmm-unstable branch.  Its filename is
     riscv-export-symbols-needed-for-riscv32-efi-stub.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/riscv-export-symbols-needed-for-riscv32-efi-stub.patch

This patch will later appear in the mm-nonmm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Dmitry Antipov <dmantipov@yandex.ru>
Subject: riscv: export symbols needed for riscv32 EFI stub
Date: Fri, 3 Apr 2026 13:33:38 +0300

Fix the following link error observed when building EFI-enabled kernel
with CONFIG_EFI_STUB=y and CONFIG_EFI_GENERIC_STUB=y:

riscv32-linux-gnu-ld: ./drivers/firmware/efi/libstub/lib-cmdline.stub.o: in function `__efistub_.L49':
__efistub_cmdline.c:(.init.text+0x1f2): undefined reference to `__efistub___ashldi3'
riscv32-linux-gnu-ld: __efistub_cmdline.c:(.init.text+0x202): undefined reference to `__efistub___lshrdi3'

Note: compile (gcc 15.2.1 and clang 21.1.8) tested only.

Link: https://lkml.kernel.org/r/20260403103338.1122415-7-dmantipov@yandex.ru
Signed-off-by: Dmitry Antipov <dmantipov@yandex.ru>
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202603041925.KLKqpK6N-lkp@intel.com
Suggested-by: Ard Biesheuvel <ardb@kernel.org>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: Alexandre Ghiti <alex@ghiti.fr>
Cc: Andy Shevchenko <andriy.shevchenko@intel.com>
Cc: "Darrick J. Wong" <djwong@kernel.org>
Cc: Kees Cook <kees@kernel.org>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Paul Walmsley <pjw@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 arch/riscv/kernel/image-vars.h |    9 +++++++++
 1 file changed, 9 insertions(+)

--- a/arch/riscv/kernel/image-vars.h~riscv-export-symbols-needed-for-riscv32-efi-stub
+++ a/arch/riscv/kernel/image-vars.h
@@ -32,6 +32,15 @@ __efistub___init_text_end	= __init_text_
 __efistub_sysfb_primary_display	= sysfb_primary_display;
 #endif
 
+#ifdef CONFIG_CC_IS_GCC
+/*
+ * Double-word integer shifts are used by the library code and so EFI stub as
+ * well. Not needed for clang and please let me know if anyone understands why.
+ */
+PROVIDE(__efistub___lshrdi3    = __lshrdi3);
+PROVIDE(__efistub___ashldi3    = __ashldi3);
+#endif /* CONFIG_CC_IS_GCC */
+
 #endif
 
 #endif /* __RISCV_KERNEL_IMAGE_VARS_H */
_

Patches currently in -mm which might be from dmantipov@yandex.ru are

lib-fix-_parse_integer_limit-to-handle-overflow.patch
lib-fix-memparse-to-handle-overflow.patch
lib-add-more-string-to-64-bit-integer-conversion-overflow-tests.patch
lib-cmdline_kunit-add-test-case-for-memparse.patch
lib-cmdline-adjust-a-few-comments-to-fix-kernel-doc-wreturn-warnings.patch
riscv-export-symbols-needed-for-riscv32-efi-stub.patch