[PATCH] kho: always print scratch sizes

[Pratyush Yadav]

From: "Pratyush Yadav (Google)" <pratyush at kernel.org>

Currently, KHO only prints scratch sizes when the size is specified
by the command line. It prints nothing when the size is calculated
at runtime by counting RSRV_KERN.

These prints are completely useless. When the user specified the size on
the command line, they already know how large the scratch areas are. And
that information is readily available by looking at the command line. It
is a lot more useful to know the sizes that are calculated at runtime
since they can vary by kernel version. Plus, if KHO fails to allocate
the scratch areas, the calculated scratch sizes are not available via
debugfs.

Print the scratch sizes in kho_reserve_scratch(). Do it before making
the allocations. The size can provide hints for the failure reason.

Signed-off-by: Pratyush Yadav (Google) <pratyush at kernel.org>
---
 kernel/liveupdate/kexec_handover.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/kernel/liveupdate/kexec_handover.c b/kernel/liveupdate/kexec_handover.c
index 33fcf848ef95..b030f53f2235 100644
--- a/kernel/liveupdate/kexec_handover.c
+++ b/kernel/liveupdate/kexec_handover.c
@@ -621,11 +621,6 @@ static int __init kho_parse_scratch_size(char *p)
 	scratch_size_pernode = sizes[2];
 	scratch_scale = 0;
 
-	pr_notice("scratch areas: lowmem: %lluMiB global: %lluMiB pernode: %lldMiB\n",
-		  (u64)(scratch_size_lowmem >> 20),
-		  (u64)(scratch_size_global >> 20),
-		  (u64)(scratch_size_pernode >> 20));
-
 	return 0;
 }
 early_param("kho_scratch", kho_parse_scratch_size);
@@ -691,6 +686,10 @@ static void __init kho_reserve_scratch(void)
 		goto err_disable_kho;
 	}
 
+	pr_notice("scratch areas: lowmem: %lluMiB global: %lluMiB\n",
+		  (u64)(scratch_size_lowmem >> 20),
+		  (u64)(scratch_size_global >> 20));
+
 	/*
 	 * reserve scratch area in low memory for lowmem allocations in the
 	 * next kernel
@@ -725,6 +724,9 @@ static void __init kho_reserve_scratch(void)
 	 */
 	for_each_node_state(nid, N_MEMORY) {
 		size = scratch_size_node(nid);
+
+		pr_notice("scratch_areas: nid %d: %lluMiB\n", nid, size >> 20);
+
 		addr = memblock_alloc_range_nid(size, CMA_MIN_ALIGNMENT_BYTES,
 						0, MEMBLOCK_ALLOC_ACCESSIBLE,
 						nid, true);

base-commit: 34e8f02817e31826e76bb2ded48bf28fe921f20b
-- 
2.54.0.563.g4f69b47b94-goog