The param area is a memory region where the kernel places additional command-line arguments for fadump kernel. Currently, the param memory area is reserved in fadump kernel if it is above boot_mem_top. However, it should be reserved if it is below boot_mem_top because the fadump kernel already reserves memory from boot_mem_top to the end of DRAM.
Currently, there is no impact from not reserving param memory if it is below boot_mem_top, as it is not used after the early boot phase of the fadump kernel. However, if this changes in the future, it could lead t issues in the fadump kernel. Cc: Mahesh Salgaonkar <mah...@linux.ibm.com> Cc: Hari Bathini <hbath...@linux.ibm.com> Cc: Michael Ellerman <m...@ellerman.id.au> Signed-off-by: Sourabh Jain <sourabhj...@linux.ibm.com> --- arch/powerpc/kernel/fadump.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/powerpc/kernel/fadump.c b/arch/powerpc/kernel/fadump.c index 4a3f80f42118..35a8a107e16b 100644 --- a/arch/powerpc/kernel/fadump.c +++ b/arch/powerpc/kernel/fadump.c @@ -143,7 +143,7 @@ void __init fadump_append_bootargs(void) if (!fw_dump.dump_active || !fw_dump.param_area_supported || !fw_dump.param_area) return; - if (fw_dump.param_area >= fw_dump.boot_mem_top) { + if (fw_dump.param_area < fw_dump.boot_mem_top) { if (memblock_reserve(fw_dump.param_area, COMMAND_LINE_SIZE)) { pr_warn("WARNING: Can't use additional parameters area!\n"); fw_dump.param_area = 0; -- 2.46.2