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SubjectRe: [PATCH] arm64: Stop printing the virtual memory layout
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On 12/19/2017 01:04 PM, Kees Cook wrote:
> On Tue, Dec 19, 2017 at 11:28 AM, Laura Abbott <labbott@redhat.com> wrote:
>> Printing kernel addresses should be done in limited circumstances, mostly
>> for debugging purposes. Printing out the virtual memory layout at every
>> kernel bootup doesn't really fall into this category so delete the prints.
>> There are other ways to get the same information.
>
> In looking at this patch, I wonder: is there anything listed here that
> is _missing_ from CONFIG_PTDUMP? I would expect all of these to
> already be listed there, but I thought I'd ask...
>

It doesn't print the .text etc. but those can be calculated other ways.

> Regardless:
>
> Acked-by: Kees Cook <keescook@chromium.org>
>
> -Kees
>
>>
>> Signed-off-by: Laura Abbott <labbott@redhat.com>
>> ---
>> Follow up to my previous proposal to switch all these to %px
>> ---
>> arch/arm64/mm/init.c | 43 -------------------------------------------
>> 1 file changed, 43 deletions(-)
>>
>> diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
>> index 5960bef0170d..672094ed7e07 100644
>> --- a/arch/arm64/mm/init.c
>> +++ b/arch/arm64/mm/init.c
>> @@ -599,49 +599,6 @@ void __init mem_init(void)
>>
>> mem_init_print_info(NULL);
>>
>> -#define MLK(b, t) b, t, ((t) - (b)) >> 10
>> -#define MLM(b, t) b, t, ((t) - (b)) >> 20
>> -#define MLG(b, t) b, t, ((t) - (b)) >> 30
>> -#define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
>> -
>> - pr_notice("Virtual kernel memory layout:\n");
>> -#ifdef CONFIG_KASAN
>> - pr_notice(" kasan : 0x%16lx - 0x%16lx (%6ld GB)\n",
>> - MLG(KASAN_SHADOW_START, KASAN_SHADOW_END));
>> -#endif
>> - pr_notice(" modules : 0x%16lx - 0x%16lx (%6ld MB)\n",
>> - MLM(MODULES_VADDR, MODULES_END));
>> - pr_notice(" vmalloc : 0x%16lx - 0x%16lx (%6ld GB)\n",
>> - MLG(VMALLOC_START, VMALLOC_END));
>> - pr_notice(" .text : 0x%p" " - 0x%p" " (%6ld KB)\n",
>> - MLK_ROUNDUP(_text, _etext));
>> - pr_notice(" .rodata : 0x%p" " - 0x%p" " (%6ld KB)\n",
>> - MLK_ROUNDUP(__start_rodata, __init_begin));
>> - pr_notice(" .init : 0x%p" " - 0x%p" " (%6ld KB)\n",
>> - MLK_ROUNDUP(__init_begin, __init_end));
>> - pr_notice(" .data : 0x%p" " - 0x%p" " (%6ld KB)\n",
>> - MLK_ROUNDUP(_sdata, _edata));
>> - pr_notice(" .bss : 0x%p" " - 0x%p" " (%6ld KB)\n",
>> - MLK_ROUNDUP(__bss_start, __bss_stop));
>> - pr_notice(" fixed : 0x%16lx - 0x%16lx (%6ld KB)\n",
>> - MLK(FIXADDR_START, FIXADDR_TOP));
>> - pr_notice(" PCI I/O : 0x%16lx - 0x%16lx (%6ld MB)\n",
>> - MLM(PCI_IO_START, PCI_IO_END));
>> -#ifdef CONFIG_SPARSEMEM_VMEMMAP
>> - pr_notice(" vmemmap : 0x%16lx - 0x%16lx (%6ld GB maximum)\n",
>> - MLG(VMEMMAP_START, VMEMMAP_START + VMEMMAP_SIZE));
>> - pr_notice(" 0x%16lx - 0x%16lx (%6ld MB actual)\n",
>> - MLM((unsigned long)phys_to_page(memblock_start_of_DRAM()),
>> - (unsigned long)virt_to_page(high_memory)));
>> -#endif
>> - pr_notice(" memory : 0x%16lx - 0x%16lx (%6ld MB)\n",
>> - MLM(__phys_to_virt(memblock_start_of_DRAM()),
>> - (unsigned long)high_memory));
>> -
>> -#undef MLK
>> -#undef MLM
>> -#undef MLK_ROUNDUP
>> -
>> /*
>> * Check boundaries twice: Some fundamental inconsistencies can be
>> * detected at build time already.
>> --
>> 2.14.3
>>
>
>
>

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