[ Upstream commit 3f7023171d ]
When a crashkernel is launched on RISC-V, the entry to purgatory is
done by trapping via the stvec CSR. From riscv_kexec_norelocate():
| ...
| /*
| * Switch to physical addressing
| * This will also trigger a jump to CSR_STVEC
| * which in this case is the address of the new
| * kernel.
| */
| csrw CSR_STVEC, a2
| csrw CSR_SATP, zero
stvec requires that the address is 4B aligned, which was not the case,
e.g.:
| Loaded purgatory at 0xffffc000
| kexec_file: kexec_file_load: type:1, start:0xffffd232 head:0x4 flags:0x6
The address 0xffffd232 not 4B aligned.
Correct by adding proper function alignment.
With this change, crashkernels loaded with kexec-file will be able to
properly enter the purgatory.
Fixes: 736e30af58 ("RISC-V: Add purgatory")
Signed-off-by: Björn Töpel <bjorn@rivosinc.com>
Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Link: https://lore.kernel.org/r/20250328085313.1193815-1-bjorn@kernel.org
Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
c35ec5e046