[PATCH] ppc/fadump: collect dump if the collected size is lesser than reserved
From: Shivang Upadhyay <hidden>
Date: 2026-07-14 17:30:43
Also in:
lkml
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Linus Torvalds
When a machine is subjected to CPUs add/remove, using dlpar operations, the number of collected CPU_NOTES can change. As per PAPR, collected dump size should not be more than allocated size. Reflecting the same in source. Signed-off-by: Shivang Upadhyay <redacted> --- arch/powerpc/platforms/pseries/rtas-fadump.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/arch/powerpc/platforms/pseries/rtas-fadump.c b/arch/powerpc/platforms/pseries/rtas-fadump.c
index 3bb4ac2ab6cc..19a5adaf326b 100644
--- a/arch/powerpc/platforms/pseries/rtas-fadump.c
+++ b/arch/powerpc/platforms/pseries/rtas-fadump.c@@ -469,7 +469,8 @@ static int __init rtas_fadump_process(struct fw_dump *fadump_conf) pr_err("Dump taken by platform is not valid (%d)\n", i); rc = -EINVAL; } - if (fdm_active->rgn[i].bytes_dumped != fdm_active->rgn[i].source_len) { + if (be64_to_cpu(fdm_active->rgn[i].bytes_dumped) + > be64_to_cpu(fdm_active->rgn[i].source_len)) { pr_err("Dump taken by platform is incomplete (%d)\n", i); rc = -EINVAL; }
--
2.54.0