This is a note to let you know that I've just added the patch titled
fadump: reserve param area if below boot_mem_top
to the 6.12-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
fadump-reserve-param-area-if-below-boot_mem_top.patch
and it can be found in the queue-6.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit add174fc65fbd783affc5f61983ab87bdd08233f
Author: Sourabh Jain <sourabhjain@xxxxxxxxxxxxx>
Date: Thu Nov 7 11:28:17 2024 +0530
fadump: reserve param area if below boot_mem_top
[ Upstream commit fb90dca828b6070709093934c6dec56489a2d91d ]
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 <hbathini@xxxxxxxxxxxxx>
Signed-off-by: Sourabh Jain <sourabhjain@xxxxxxxxxxxxx>
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Link: https://patch.msgid.link/20241107055817.489795-2-sourabhjain@xxxxxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/arch/powerpc/kernel/fadump.c b/arch/powerpc/kernel/fadump.c
index 6ab7934d719f7..4641de75f7fc1 100644
--- a/arch/powerpc/kernel/fadump.c
+++ b/arch/powerpc/kernel/fadump.c
@@ -136,7 +136,7 @@ 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;
