riscv: fix building compressed EFI image

When building vmlinuz.efi with CONFIG_EFI_ZBOOT enabled, '__lshrdi3()'
is also needed to fix yet another link error observed when building
riscv32 and loongarch32 images:

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

/usr/bin/loongarch32-linux-gnu-ld: ./drivers/firmware/efi/libstub/lib-cmdline.stub.o: in function `__efistub_.L47':
__efistub_cmdline.c:(.init.text+0x26c): undefined reference to `__efistub___lshrdi3'

And since both riscv64 and loongarch64 can have CONFIG_EFI_ZBOOT but
doesn't need these library routines, rely on CONFIG_32BIT to manage
linking of lib-ashldi3.o and lib-lshrdi3.o on 32-bit variants only.

[dmantipov@yandex.ru: fix loongarch32]
Link: https://lore.kernel.org/8095016e47aceab4830c2523ce78af968ec0497e.camel@yandex.ru
Link: https://lore.kernel.org/20260519172259.908980-9-dmantipov@yandex.ru
Signed-off-by: Dmitry Antipov <dmantipov@yandex.ru>
Reported-by: Charlie Jenkins <thecharlesjenkins@gmail.com>
Closes: https://lore.kernel.org/linux-riscv/20260409050018.GA371560@inky.localdomain
Tested-by: Charlie Jenkins <thecharlesjenkins@gmail.com>
Suggested-by: Ard Biesheuvel <ardb@kernel.org>
Assisted-by: Gemini:gemini-3.1-pro-preview sashiko
Tested-by: Charlie Jenkins <thecharlesjenkins@gmail.com>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: Alexandre Ghiti <alex@ghiti.fr>
Cc: Andriy Shevchenko <andriy.shevchenko@intel.com>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/drivers/firmware/efi/libstub/Makefile b/drivers/firmware/efi/libstub/Makefile
index cfedb3025c26385451e7229fb49ed82227fa66fe..77a2b2d74f3f6266704b16441e4759f2990c8f16 100644 (file)
--- a/drivers/firmware/efi/libstub/Makefile
+++ b/drivers/firmware/efi/libstub/Makefile
@@ -95,8 +95,10 @@ CFLAGS_zboot-decompress-gzip.o       += -I$(srctree)/lib/zlib_inflate
 zboot-obj-$(CONFIG_KERNEL_ZSTD)        := zboot-decompress-zstd.o lib-xxhash.o
 CFLAGS_zboot-decompress-zstd.o += -I$(srctree)/lib/zstd
 
-zboot-obj-$(CONFIG_RISCV)      += lib-clz_ctz.o lib-ashldi3.o
-zboot-obj-$(CONFIG_LOONGARCH)  += lib-clz_ctz.o lib-ashldi3.o
+zboot-riscv-obj-$(CONFIG_32BIT)        := lib-ashldi3.o lib-lshrdi3.o
+zboot-obj-$(CONFIG_RISCV)      += lib-clz_ctz.o $(zboot-riscv-obj-y)
+zboot-loongarch-obj-$(CONFIG_32BIT) := lib-ashldi3.o lib-lshrdi3.o
+zboot-obj-$(CONFIG_LOONGARCH)  += lib-clz_ctz.o $(zboot-loongarch-obj-y)
 lib-$(CONFIG_EFI_ZBOOT)                += zboot.o $(zboot-obj-y)
 
 lib-$(CONFIG_UNACCEPTED_MEMORY) += unaccepted_memory.o bitmap.o find.o