[PATCH] powerpc/fadump: reset dump area size variable if memblock reserve fails

Sourabh Jain sourabhjain at linux.ibm.com
Thu Jun 8 19:22:46 AEST 2023

If the memory reservation process (memblock_reserve) fails to reserve
the memory, the reserve dump variable retains the dump area size.
Consequently, the size of the dump area calculated for reservation
is displayed in /sys/kernel/fadump/mem_reserved.

To resolve this issue, the reserve dump area size variable is set to 0
if the memblock_reserve fails to reserve memory.

Fixes: 8255da95e545 ("powerpc/fadump: release all the memory above boot memory size")
Signed-off-by: Sourabh Jain <sourabhjain at linux.ibm.com>
Acked-by: Mahesh Salgaonkar <mahesh at linux.ibm.com>
 arch/powerpc/kernel/fadump.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/powerpc/kernel/fadump.c b/arch/powerpc/kernel/fadump.c
index ea0a073abd96..a8f2c3b2fa1e 100644
--- a/arch/powerpc/kernel/fadump.c
+++ b/arch/powerpc/kernel/fadump.c
@@ -641,6 +641,7 @@ int __init fadump_reserve_mem(void)
 			goto error_out;
 		if (memblock_reserve(base, size)) {
+			fw_dump.reserve_dump_area_size = 0;
 			pr_err("Failed to reserve memory!\n");
 			goto error_out;

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