From: Torsten Duwe duwe@suse.de
commit 49af7a2cd5f678217b8b4f86a29411aebebf3e78 upstream.
When initrd is loaded low, the secondary kernel fails like this:
INITRD: 0xdc581000+0x00eef000 overlaps in-use memory region
This initrd load address corresponds to the _end symbol, but the reservation is aligned on PMD_SIZE, as explained by a comment in setup_bootmem().
It is technically possible to align the initrd load address accordingly, leaving a hole between the end of kernel and the initrd, but it is much simpler to allocate the initrd top-down.
Fixes: 838b3e28488f ("RISC-V: Load purgatory in kexec_file") Signed-off-by: Torsten Duwe duwe@suse.de Signed-off-by: Petr Tesarik petr.tesarik.ext@huawei.com Cc: stable@vger.kernel.org Reviewed-by: Conor Dooley conor.dooley@microchip.com Link: https://lore.kernel.org/all/67c8eb9eea25717c2c8208d9bfbfaa39e6e2a1c6.1690365... Signed-off-by: Palmer Dabbelt palmer@rivosinc.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/riscv/kernel/elf_kexec.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/riscv/kernel/elf_kexec.c +++ b/arch/riscv/kernel/elf_kexec.c @@ -281,7 +281,7 @@ static void *elf_kexec_load(struct kimag kbuf.buffer = initrd; kbuf.bufsz = kbuf.memsz = initrd_len; kbuf.buf_align = PAGE_SIZE; - kbuf.top_down = false; + kbuf.top_down = true; kbuf.mem = KEXEC_BUF_MEM_UNKNOWN; ret = kexec_add_buffer(&kbuf); if (ret)