linux-kernel - Re: [PATCH v2] mm: page_alloc: Add debug log in free_reserved

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date:   Mon, 11 Oct 2021 12:28:45 +0530
From:   Faiyaz Mohammed <faiyazm@...eaurora.org>
To:     Faiyaz Mohammed <quic_faiyazm@...eaurora.org>,
        akpm@...ux-foundation.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, david@...hat.com
Cc:     guptap@...eaurora.org
Subject: Re: [PATCH v2] mm: page_alloc: Add debug log in free_reserved_area
 for static memory

Please ignore this patch.

On 10/11/2021 12:25 PM, Faiyaz Mohammed wrote:
> From: Faiyaz Mohammed <faiyazm@...eaurora.org>
> 
> For INITRD and initmem memory is reserved through "memblock_reserve"
> during boot up but it is free via "free_reserved_area" instead
> of "memblock_free".
> For example:
> [    0.294848] Freeing initrd memory: 12K.
> [    0.696688] Freeing unused kernel memory: 4096K.
> 
> To get the start and end address of the above freed memory and to account
> proper memblock added pr_debug log in "free_reserved_area".
> After adding log:
> [    0.294837] 0x00000083600000-0x00000083603000 free_initrd_mem+0x20/0x28
> [    0.294848] Freeing initrd memory: 12K.
> [    0.695246] 0x00000081600000-0x00000081a00000 free_initmem+0x70/0xc8
> [    0.696688] Freeing unused kernel memory: 4096K.
> 
> Signed-off-by: Faiyaz Mohammed <faiyazm@...eaurora.org>
> ---
>  mm/page_alloc.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index 668edb1..8a1929d4 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -8153,6 +8153,11 @@ unsigned long free_reserved_area(void *start, void *end, int poison, const char
>  	if (pages && s)
>  		pr_info("Freeing %s memory: %ldK\n", s, K(pages));
>  
> +#ifdef CONFIG_HAVE_MEMBLOCK
> +		memblock_dbg("memblock_free: [%#016llx-%#016llx] %pS\n",
> +			__pa(start), __pa(end), (void *)_RET_IP_);
> +#endif
> +
>  	return pages;
>  }
>  
>