[PATCH v3 2/7] kho: move scratch memory in separate helper.
From: Andrey Ryabinin <hidden>
Date: 2025-09-09 20:15:34
Also in:
kexec, linux-mm, lkml
Subsystem:
kexec handover (kho), live update, the rest · Maintainers:
Mike Rapoport, Pasha Tatashin, Pratyush Yadav, Linus Torvalds
Move scratch memory initialization logic from kho_populate() into a new helper function kho_scrath_init(). This prepares for using KSTATE in KHO instead of FDT. Signed-off-by: Andrey Ryabinin <redacted> --- kernel/liveupdate/kexec_handover.c | 34 ++++++++++++++++++++---------- 1 file changed, 23 insertions(+), 11 deletions(-)
diff --git a/kernel/liveupdate/kexec_handover.c b/kernel/liveupdate/kexec_handover.c
index e5a436893f5b..a99425fdfce4 100644
--- a/kernel/liveupdate/kexec_handover.c
+++ b/kernel/liveupdate/kexec_handover.c@@ -1111,19 +1111,12 @@ static int __init kho_fdt_init(phys_addr_t fdt_phys, u64 fdt_len) return err; } -void __init kho_populate(phys_addr_t fdt_phys, u64 fdt_len, - phys_addr_t scratch_phys, u64 scratch_len) +static int __init kho_scratch_init(phys_addr_t scratch_phys, u64 scratch_len) { - - struct kho_scratch *scratch = NULL; int err = 0; + struct kho_scratch *scratch = NULL; unsigned int scratch_cnt = scratch_len / sizeof(*kho_scratch); - - err = kho_fdt_init(fdt_phys, fdt_len); - if (err) - goto out; - scratch = early_memremap(scratch_phys, scratch_len); if (!scratch) { pr_warn("setup: failed to memremap scratch (phys=0x%llx, len=%lld)\n",
@@ -1161,6 +1154,27 @@ void __init kho_populate(phys_addr_t fdt_phys, u64 fdt_len, * memory reservations from the previous kernel. */ memblock_set_kho_scratch_only(); +out: + if (scratch) + early_memunmap(scratch, scratch_len); + + return err; +} + +void __init kho_populate(phys_addr_t fdt_phys, u64 fdt_len, + phys_addr_t scratch_phys, u64 scratch_len) +{ + + int err = 0; + unsigned int scratch_cnt = scratch_len / sizeof(*kho_scratch); + + err = kho_fdt_init(fdt_phys, fdt_len); + if (err) + goto out; + + err = kho_scratch_init(scratch_phys, scratch_len); + if (err) + goto out; kho_in.fdt_phys = fdt_phys; kho_in.scratch_phys = scratch_phys;
@@ -1168,8 +1182,6 @@ void __init kho_populate(phys_addr_t fdt_phys, u64 fdt_len, pr_info("found kexec handover data. Will skip init for some devices\n"); out: - if (scratch) - early_memunmap(scratch, scratch_len); if (err) pr_warn("disabling KHO revival: %d\n", err); }
--
2.49.1