memblock: don't release high memory to page allocator when HIGHMEM is off

Nathan Chancellor reports the following crash on a MIPS system with
CONFIG_HIGHMEM=n:

  Linux version 6.14.0-rc6-00359-g6faea3422e3b (nathan@ax162) (mips-linux-gcc (GCC) 14.2.0, GNU ld (GNU Binutils) 2.42) #1 SMP Fri Mar 21 08:12:02 MST 2025
  earlycon: uart8250 at I/O port 0x3f8 (options '38400n8')
  printk: legacy bootconsole [uart8250] enabled
  Config serial console: console=ttyS0,38400n8r
  CPU0 revision is: 00019300 (MIPS 24Kc)
  FPU revision is: 00739300
  MIPS: machine is mti,malta
  Software DMA cache coherency enabled
  Initial ramdisk at: 0x8fad0000 (5360128 bytes)
  OF: reserved mem: Reserved memory: No reserved-memory node in the DT
  Primary instruction cache 2kB, VIPT, 2-way, linesize 16 bytes.
  Primary data cache 2kB, 2-way, VIPT, no aliases, linesize 16 bytes
  Zone ranges:
    DMA      [mem 0x0000000000000000-0x0000000000ffffff]
    Normal   [mem 0x0000000001000000-0x000000001fffffff]
  Movable zone start for each node
  Early memory node ranges
    node   0: [mem 0x0000000000000000-0x000000000fffffff]
    node   0: [mem 0x0000000090000000-0x000000009fffffff]
  Initmem setup node 0 [mem 0x0000000000000000-0x000000009fffffff]
  On node 0, zone Normal: 16384 pages in unavailable ranges
  random: crng init done
  percpu: Embedded 3 pages/cpu s18832 r8192 d22128 u49152
  Kernel command line: rd_start=0xffffffff8fad0000 rd_size=5360128  console=ttyS0,38400n8r
  printk: log buffer data + meta data: 32768 + 102400 = 135168 bytes
  Dentry cache hash table entries: 65536 (order: 4, 262144 bytes, linear)
  Inode-cache hash table entries: 32768 (order: 3, 131072 bytes, linear)
  Writing ErrCtl register=00000000
  Readback ErrCtl register=00000000
  Built 1 zonelists, mobility grouping on.  Total pages: 16384
  mem auto-init: stack:all(zero), heap alloc:off, heap free:off
  Unhandled kernel unaligned access[#1]:
  CPU: 0 UID: 0 PID: 0 Comm: swapper Not tainted 6.14.0-rc6-00359-g6faea3422e3b #1
  Hardware name: mti,malta
  $ 0   : 00000000 00000001 81cb0880 00129027
  $ 4   : 00000001 0000000a 00000002 00129026
  $ 8   : ffffdfff 80101e00 00000002 00000000
  $12   : 81c9c224 81c63e68 00000002 00000000
  $16   : 805b1e00 00025800 81cb0880 00000002
  $20   : 00000000 81c63e6 0000000a 81f10000
  $24   : 81c63e6 81c63e60
  $28   : 81c60000 81c63de0 00000001 81cc9d20
  Hi    : 00000000
  Lo    : 00000000
  epc   : 814a227c __free_pages_ok+0x144/0x3c0
  ra    : 81cc9d20 memblock_free_all+0x1d4/0x27c
  Status: 10000002        KERNEL EXL
  Cause : 00800410 (ExcCode 04)
  BadVA : 00129026
  PrId  : 00019300 (MIPS 24Kc)
  Modules linked in:
  Process swapper (pid: 0, threadinfo=(ptrval), task=(ptrval), tls=00000000)
  Stack : 81f10000 805a9e00 81c80000 00000000 00000002 814aa240 000003ff 00000400
          00000000 81f10000 81c9c224 00003b1f 81c80000 81c63e60 81ca0000 81c63e6
          81f10000 0000000a 0000001f 81cc9d20 81f10000 81cc96d8 00000000 81c80000
          81c9c224 81c63e60 81c63e6 00000000 81f10000 00024000 00028000 00025c00
          90000000 a0000000 00000002 00000017 00000000 00000000 81f10000 81f10000
          ...
  Call Trace:
  [<814a227c>] __free_pages_ok+0x144/0x3c0
  [<81cc9d20>] memblock_free_all+0x1d4/0x27c
  [<81cc6764>] mm_core_init+0x100/0x138
  [<81cb4ba4>] start_kernel+0x4a0/0x6e4

  Code: 1080ffd5  02003825  2467ffff <8ce30000> 7c630500  1060ffd4  00000000  8ce30000  7c630180

The crash happens because commit 6faea34 ("arch, mm: streamline
HIGHMEM freeing") too eagerly frees high memory to the page allocator even
when HIGHMEM is disabled.

Make sure that when CONFIG_HIGHMEM=n the high memory is not released to the
page allocator.

Link: https://lore.kernel.org/all/20250323190647.GA1009914@ax162
Link: https://lkml.kernel.org/r/[email protected]
Reported-by: Nathan Chancellor <[email protected]>
Fixes: 6faea34 ("arch, mm: streamline HIGHMEM freeing")
Signed-off-by: Mike Rapoport (Microsoft) <[email protected]>
Tested-by: Nathan Chancellor <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: Borislav Betkov <[email protected]>
Cc: Dave Hansen <[email protected]>
Cc: "H. Peter Anvin" <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jiaxun Yang <[email protected]>
Cc: Thomas Bogendoerfer <[email protected]>
Cc: Thomas Gleinxer <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

Author: rppt

mm/memblock.c

@@ -2167,6 +2167,9 @@ static unsigned long __init __free_memory_core(phys_addr_t start,
 	unsigned long start_pfn = PFN_UP(start);
 	unsigned long end_pfn = PFN_DOWN(end);
 
+	if (!IS_ENABLED(CONFIG_HIGHMEM) && end_pfn > max_low_pfn)
+		end_pfn = max_low_pfn;
+
 	if (start_pfn >= end_pfn)
 		return 0;