From fb90dca828b6070709093934c6dec56489a2d91d Mon Sep 17 00:00:00 2001 From: Sourabh Jain Date: Thu, 7 Nov 2024 11:28:17 +0530 Subject: fadump: reserve param area if below boot_mem_top 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 to issues in the fadump kernel. Fixes: 3416c9daa6b1 ("powerpc/fadump: pass additional parameters when fadump is active") Acked-by: Hari Bathini Signed-off-by: Sourabh Jain Signed-off-by: Michael Ellerman Link: https://patch.msgid.link/20241107055817.489795-2-sourabhjain@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 5583017bbfbc..4b371c738213 100644 --- a/arch/powerpc/kernel/fadump.c +++ b/arch/powerpc/kernel/fadump.c @@ -153,7 +153,7 @@ 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; -- cgit v1.2.3-70-g09d2