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powerpc/mem: Move CMA reservations to arch_mm_preinit

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commit 4267739cab ("arch, mm: consolidate initialization of SPARSE memory model"),
changed the initialization order of "pageblock_order" from...
start_kernel()
    - setup_arch()
       - initmem_init()
         - sparse_init()
           - set_pageblock_order();  // this sets the pageblock_order
       - xxx_cma_reserve();

to...
start_kernel()
    - setup_arch()
       - xxx_cma_reserve();
    - mm_core_init_early()
       - free_area_init()
          - sparse_init()
             - set_pageblock_order() // this sets the pageblock_order.

So this means, pageblock_order is not initialized before these cma
reservation function calls, hence we are seeing CMA failures like...

[    0.000000] kvm_cma_reserve: reserving 3276 MiB for global area
[    0.000000] cma: pageblock_order not yet initialized. Called during early boot?
[    0.000000] cma: Failed to reserve 3276 MiB
....
[    0.000000][    T0] cma: pageblock_order not yet initialized. Called during early boot?
[    0.000000][    T0] cma: Failed to reserve 1024 MiB

This patch moves these CMA reservations to arch_mm_preinit() which
happens in mm_core_init() (which happens after pageblock_order is
initialized), but before the memblock moves the free memory to buddy.

Fixes: 4267739cab ("arch, mm: consolidate initialization of SPARSE memory model")
Suggested-by: Mike Rapoport <rppt@kernel.org>
Reported-and-tested-by: Sourabh Jain <sourabhjain@linux.ibm.com>
Closes: https://lore.kernel.org/linuxppc-dev/4c338a29-d190-44f3-8874-6cfa0a031f0b@linux.ibm.com/
Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Tested-by: Dan Horák <dan@danny.cz>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/6e532cf0db5be99afbe20eed699163d5e86cd71f.1772303986.git.ritesh.list@gmail.com
This commit is contained in:
Ritesh Harjani (IBM)
2026-03-01 00:17:59 +05:30
committed by Madhavan Srinivasan
parent 35e4f2a17e
commit 0a8321dde0
2 changed files with 14 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
arch/powerpc/kernel/setup-common.c
View File

@@ -35,7 +35,6 @@
#include <linux/of_irq.h>
#include <linux/hugetlb.h>
#include <linux/pgtable.h>
#include <asm/kexec.h>
#include <asm/io.h>
#include <asm/paca.h>
#include <asm/processor.h>
@@ -995,15 +994,6 @@ void __init setup_arch(char **cmdline_p)
initmem_init();
/*
* Reserve large chunks of memory for use by CMA for kdump, fadump, KVM and
* hugetlb. These must be called after initmem_init(), so that
* pageblock_order is initialised.
*/
fadump_cma_init();
kdump_cma_reserve();
kvm_cma_reserve();
early_memtest(min_low_pfn << PAGE_SHIFT, max_low_pfn << PAGE_SHIFT);
if (ppc_md.setup_arch)

14
arch/powerpc/mm/mem.c
View File

@@ -30,6 +30,10 @@
#include <asm/setup.h>
#include <asm/fixmap.h>
#include <asm/fadump.h>
#include <asm/kexec.h>
#include <asm/kvm_ppc.h>
#include <mm/mmu_decl.h>
unsigned long long memory_limit __initdata;
@@ -268,6 +272,16 @@ void __init paging_init(void)
void __init arch_mm_preinit(void)
{
/*
* Reserve large chunks of memory for use by CMA for kdump, fadump, KVM
* and hugetlb. These must be called after pageblock_order is
* initialised.
*/
fadump_cma_init();
kdump_cma_reserve();
kvm_cma_reserve();
/*
* book3s is limited to 16 page sizes due to encoding this in
* a 4-bit field for slices.