Commit 8afa901c authored Mar 13, 2025 by Mike Rapoport (Microsoft) Committed by Andrew Morton Mar 17, 2025

arch, mm: make releasing of memory to page allocator more explicit

The point where the memory is released from memblock to the buddy
allocator is hidden inside arch-specific mem_init()s and the call to
memblock_free_all() is needlessly duplicated in every artiste cure and
after introduction of arch_mm_preinit() hook, mem_init() implementation on
many architecture only contains the call to memblock_free_all().

Pull memblock_free_all() call into mm_core_init() and drop mem_init() on
relevant architectures to make it more explicit where the free memory is
released from memblock to the buddy allocator and to reduce code
duplication in architecture specific code.

Link: https://lkml.kernel.org/r/20250313135003.836600-14-rppt@kernel.org


Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Acked-by: Dave Hansen <dave.hansen@linux.intel.com>	[x86]
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>	[m68k]
Tested-by: Mark Brown <broonie@kernel.org>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Andreas Larsson <andreas@gaisler.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Ard Biesheuvel <ardb@kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Borislav Betkov <bp@alien8.de>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Dinh Nguyen <dinguyen@kernel.org>
Cc: Gerald Schaefer <gerald.schaefer@linux.ibm.com>
Cc: Guo Ren (csky) <guoren@kernel.org>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Helge Deller <deller@gmx.de>
Cc: Huacai Chen <chenhuacai@kernel.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc: Johannes Berg <johannes@sipsolutions.net>
Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Richard Weinberger <richard@nod.at>
Cc: Russel King <linux@armlinux.org.uk>
Cc: Stafford Horne <shorne@gmail.com>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Thomas Gleinxer <tglx@linutronix.de>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Vineet Gupta <vgupta@kernel.org>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

parent 0d98484e

arch/alpha/mm/init.c

+0 −6

Original line number	Diff line number	Diff line
		@@ -273,12 +273,6 @@ srm_paging_stop (void)
		}
		#endif

		void __init
		mem_init(void)
		{
		memblock_free_all();
		}

		static const pgprot_t protection_map[16] = {
		[VM_NONE] = _PAGE_P(_PAGE_FOE \| _PAGE_FOW \|
		_PAGE_FOR),

arch/arc/mm/init.c

+0 −11

Original line number	Diff line number	Diff line
		@@ -169,17 +169,6 @@ void __init arch_mm_preinit(void)
		BUILD_BUG_ON((PTRS_PER_PTE * sizeof(pte_t)) > PAGE_SIZE);
		}

		/*
		* mem_init - initializes memory
		*
		* Frees up bootmem
		* Calculates and displays memory available/used
		*/
		void __init mem_init(void)
		{
		memblock_free_all();
		}

		#ifdef CONFIG_HIGHMEM
		int pfn_valid(unsigned long pfn)
		{

arch/arm/mm/init.c

+0 −11

Original line number	Diff line number	Diff line
		@@ -263,17 +263,6 @@ void __init arch_mm_preinit(void)
		#endif
		}

		/*
		* mem_init() marks the free areas in the mem_map and tells us how much
		* memory is free. This is done after various parts of the system have
		* claimed their memory after the kernel image.
		*/
		void __init mem_init(void)
		{
		/* this will put all unused low memory onto the freelists */
		memblock_free_all();
		}

		#ifdef CONFIG_STRICT_KERNEL_RWX
		struct section_perm {
		const char *name;

arch/arm64/mm/init.c

+0 −11

Original line number	Diff line number	Diff line
		@@ -406,17 +406,6 @@ void __init arch_mm_preinit(void)
		}
		}

		/*
		* mem_init() marks the free areas in the mem_map and tells us how much memory
		* is free. This is done after various parts of the system have claimed their
		* memory after the kernel image.
		*/
		void __init mem_init(void)
		{
		/* this will put all unused low memory onto the freelists */
		memblock_free_all();
		}

		void free_initmem(void)
		{
		void *lm_init_begin = lm_alias(__init_begin);

arch/csky/mm/init.c

+0 −5

Original line number	Diff line number	Diff line
		@@ -42,11 +42,6 @@ unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]
		__page_aligned_bss;
		EXPORT_SYMBOL(empty_zero_page);

		void __init mem_init(void)
		{
		memblock_free_all();
		}

		void free_initmem(void)
		{
		free_initmem_default(-1);