From: Geert Uytterhoeven geert@linux-m68k.org
[ Upstream commit bed1369f51901b17108a4bb4f7210aab183bea42 ]
When running the kernel in Fast RAM on Atari:
Ignoring memory chunk at 0x0:0xe00000 before the first chunk ... Unable to handle kernel NULL pointer dereference at virtual address (ptrval) Oops: 00000000 Modules linked in: PC: [<0069dbac>] free_all_bootmem+0x12c/0x186 SR: 2714 SP: (ptrval) a2: 005e3314 d0: 00000000 d1: 0000000a d2: 00000e00 d3: 00000000 d4: 005e1fc0 d5: 0000001a a0: 01000000 a1: 00000000 Process swapper (pid: 0, task=(ptrval)) Frame format=7 eff addr=00000736 ssw=0505 faddr=00000736 wb 1 stat/addr/data: 0000 00000000 00000000 wb 2 stat/addr/data: 0000 00000000 00000000 wb 3 stat/addr/data: 0000 00000736 00000000 push data: 00000000 00000000 00000000 00000000 Stack from 005e1f84: 00000000 0000000a 027d3260 006b5006 00000000 00000000 00000000 00000000 0004f062 0003a220 0069e272 005e1ff8 0000054c 00000000 00e00000 00000000 00000001 00693cd8 027d3260 0004f062 0003a220 00691be6 00000000 00000000 00000000 00000000 00000000 00000000 006b5006 00000000 00690872 Call Trace: [<0004f062>] printk+0x0/0x18 [<0003a220>] parse_args+0x0/0x2d4 [<0069e272>] memblock_virt_alloc_try_nid+0x0/0xa4 [<00693cd8>] mem_init+0xa/0x5c [<0004f062>] printk+0x0/0x18 [<0003a220>] parse_args+0x0/0x2d4 [<00691be6>] start_kernel+0x1ca/0x462 [<00690872>] _sinittext+0x872/0x11f8 Code: 7a1a eaae 2270 6db0 0061 ef14 2f01 2f03 <96a9> 0736 2203 e589 d681 e78b d6a9 0732 2f03 2f40 0034 4eb9 0069 b8d0 260e 4fef Disabling lock debugging due to kernel taint Kernel panic - not syncing: Attempted to kill the idle task!
As the kernel must run in the memory chunk with the lowest address, ST-RAM is ignored, and removed from the m68k_memory[] array. However, it is not removed from memblock, causing a crash later.
More investigation shows that there are 3 places where memory chunks are ignored, all after the calls to memblock_add() in m68k_parse_bootinfo(), and thus causing crashes: 1. On classic m68k CPUs with a MMU, paging_init() ignores all memory chunks below the first chunk, cfr. above, 2. On Amigas equipped with a Zorro III bus, config_amiga() ignores all Zorro II memory, 3. If CONFIG_SINGLE_MEMORY_CHUNK=y, m68k_parse_bootinfo() ignores all but the first memory chunk.
Fix this by moving the calls to memblock_add() from m68k_parse_bootinfo() to paging_init(), after all ignored memory chunks have been removed from m68k_memory[].
Reported-by: Andreas Schwab schwab@linux-m68k.org Fixes: 1008a11590b966b4 ("m68k: switch to MEMBLOCK + NO_BOOTMEM") Signed-off-by: Geert Uytterhoeven geert@linux-m68k.org Signed-off-by: Sasha Levin sashal@kernel.org --- arch/m68k/kernel/setup_mm.c | 2 -- arch/m68k/mm/motorola.c | 2 ++ 2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/m68k/kernel/setup_mm.c b/arch/m68k/kernel/setup_mm.c index 5d3596c180f9..de44899c0e61 100644 --- a/arch/m68k/kernel/setup_mm.c +++ b/arch/m68k/kernel/setup_mm.c @@ -165,8 +165,6 @@ static void __init m68k_parse_bootinfo(const struct bi_record *record) be32_to_cpu(m->addr); m68k_memory[m68k_num_memory].size = be32_to_cpu(m->size); - memblock_add(m68k_memory[m68k_num_memory].addr, - m68k_memory[m68k_num_memory].size); m68k_num_memory++; } else pr_warn("%s: too many memory chunks\n", diff --git a/arch/m68k/mm/motorola.c b/arch/m68k/mm/motorola.c index 4e17ecb5928a..2eb2b31fb16a 100644 --- a/arch/m68k/mm/motorola.c +++ b/arch/m68k/mm/motorola.c @@ -228,6 +228,7 @@ void __init paging_init(void)
min_addr = m68k_memory[0].addr; max_addr = min_addr + m68k_memory[0].size; + memblock_add(m68k_memory[0].addr, m68k_memory[0].size); for (i = 1; i < m68k_num_memory;) { if (m68k_memory[i].addr < min_addr) { printk("Ignoring memory chunk at 0x%lx:0x%lx before the first chunk\n", @@ -238,6 +239,7 @@ void __init paging_init(void) (m68k_num_memory - i) * sizeof(struct m68k_mem_info)); continue; } + memblock_add(m68k_memory[i].addr, m68k_memory[i].size); addr = m68k_memory[i].addr + m68k_memory[i].size; if (addr > max_addr) max_addr = addr;