libstub: Fix compilation warning for rv32

Fix the following warning which appears when compiled for rv32 by using
unsigned long type instead of u64.

../drivers/firmware/efi/libstub/efi-stub-helper.c: In function 'efi_kaslr_relocate_kernel':
../drivers/firmware/efi/libstub/efi-stub-helper.c:846:28: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
  846 |                            (u64)_end < EFI_ALLOC_LIMIT) {

Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Tested-by: Conor Dooley <conor.dooley@microchip.com>
Tested-by: Song Shuai <songshuaishuai@tinylab.org>
Reviewed-by: Sami Tolvanen <samitolvanen@google.com>
Tested-by: Sami Tolvanen <samitolvanen@google.com>
Link: https://lore.kernel.org/r/20230722123850.634544-5-alexghiti@rivosinc.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>

diff --git a/drivers/firmware/efi/libstub/kaslr.c b/drivers/firmware/efi/libstub/kaslr.c
index be0c8ab..afb8573 100644 (file)
--- a/drivers/firmware/efi/libstub/kaslr.c
+++ b/drivers/firmware/efi/libstub/kaslr.c
@@ -130,7 +130,7 @@ efi_status_t efi_kaslr_relocate_kernel(unsigned long *image_addr,
                if (!check_image_region(*image_addr, kernel_memsize)) {
                        efi_err("FIRMWARE BUG: Image BSS overlaps adjacent EFI memory region\n");
                } else if (IS_ALIGNED(*image_addr, min_kimg_align) &&
-                          (u64)_end < EFI_ALLOC_LIMIT) {
+                          (unsigned long)_end < EFI_ALLOC_LIMIT) {
                        /*
                         * Just execute from wherever we were loaded by the
                         * UEFI PE/COFF loader if the placement is suitable.