linux-kernel - [PATCH v2 1/2] mm/memblock: remove CONFIG_MEMBLOCK_KHO

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Message-ID: <20251127203724.3177621-2-usamaarif642@gmail.com>
Date: Thu, 27 Nov 2025 20:33:19 +0000
From: Usama Arif <usamaarif642@...il.com>
To: rppt@...nel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Cc: kas@...nel.org,
	changyuanl@...gle.com,
	graf@...zon.com,
	leitao@...ian.org,
	thevlad@...a.com,
	pratyush@...nel.org,
	dave.hansen@...ux.intel.com,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	kernel-team@...a.com,
	Usama Arif <usamaarif642@...il.com>
Subject: [PATCH v2 1/2] mm/memblock: remove CONFIG_MEMBLOCK_KHO_SCRATCH option

The only defconfig that selects this is CONFIG_KEXEC_HANDOVER.
Replace CONFIG_MEMBLOCK_KHO_SCRATCH with CONFIG_KEXEC_HANDOVER
to simplify code.
No functional change intended.

Suggested-by: Kiryl Shutsemau <kas@...nel.org>
Signed-off-by: Usama Arif <usamaarif642@...il.com>
---
 include/linux/memblock.h | 2 +-
 kernel/Kconfig.kexec     | 1 -
 mm/Kconfig               | 4 ----
 mm/memblock.c            | 4 ++--
 4 files changed, 3 insertions(+), 8 deletions(-)

diff --git a/include/linux/memblock.h b/include/linux/memblock.h
index 221118b5a16e1..8bd9bcaccceb8 100644
--- a/include/linux/memblock.h
+++ b/include/linux/memblock.h
@@ -611,7 +611,7 @@ static inline void early_memtest(phys_addr_t start, phys_addr_t end) { }
 static inline void memtest_report_meminfo(struct seq_file *m) { }
 #endif
 
-#ifdef CONFIG_MEMBLOCK_KHO_SCRATCH
+#ifdef CONFIG_KEXEC_HANDOVER
 void memblock_set_kho_scratch_only(void);
 void memblock_clear_kho_scratch_only(void);
 void memmap_init_kho_scratch_pages(void);
diff --git a/kernel/Kconfig.kexec b/kernel/Kconfig.kexec
index 54e5810726176..06a7c43652cfd 100644
--- a/kernel/Kconfig.kexec
+++ b/kernel/Kconfig.kexec
@@ -98,7 +98,6 @@ config KEXEC_HANDOVER
 	bool "kexec handover"
 	depends on ARCH_SUPPORTS_KEXEC_HANDOVER && ARCH_SUPPORTS_KEXEC_FILE
 	depends on !DEFERRED_STRUCT_PAGE_INIT
-	select MEMBLOCK_KHO_SCRATCH
 	select KEXEC_FILE
 	select DEBUG_FS
 	select LIBFDT
diff --git a/mm/Kconfig b/mm/Kconfig
index bd0ea5454af82..6d6002f57c18f 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -442,10 +442,6 @@ config HAVE_GUP_FAST
 	depends on MMU
 	bool
 
-# Enable memblock support for scratch memory which is needed for kexec handover
-config MEMBLOCK_KHO_SCRATCH
-	bool
-
 # Don't discard allocated memory used to track "memory" and "reserved" memblocks
 # after early boot, so it can still be used to test for validity of memory.
 # Also, memblocks are updated with memory hot(un)plug.
diff --git a/mm/memblock.c b/mm/memblock.c
index e23e16618e9b3..8b13d5c28922a 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -112,7 +112,7 @@ unsigned long min_low_pfn;
 unsigned long max_pfn;
 unsigned long long max_possible_pfn;
 
-#ifdef CONFIG_MEMBLOCK_KHO_SCRATCH
+#ifdef CONFIG_KEXEC_HANDOVER
 /* When set to true, only allocate from MEMBLOCK_KHO_SCRATCH ranges */
 static bool kho_scratch_only;
 #else
@@ -948,7 +948,7 @@ int __init_memblock memblock_physmem_add(phys_addr_t base, phys_addr_t size)
 }
 #endif
 
-#ifdef CONFIG_MEMBLOCK_KHO_SCRATCH
+#ifdef CONFIG_KEXEC_HANDOVER
 __init void memblock_set_kho_scratch_only(void)
 {
 	kho_scratch_only = true;
-- 
2.47.3