linux-kernel - Re: [PATCHv3] mm: use stack_depot_early

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Date:   Wed, 18 Jan 2023 14:34:30 +0000
From:   Catalin Marinas <catalin.marinas@....com>
To:     "zhaoyang.huang" <zhaoyang.huang@...soc.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Nathan Chancellor <nathan@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Zhaoyang Huang <huangzhaoyang@...il.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, ke.wang@...soc.com,
        Mirsad Todorovac <mirsad.todorovac@....unizg.hr>
Subject: Re: [PATCHv3] mm: use stack_depot_early_init for kmemleak

On Wed, Jan 18, 2023 at 10:07:35AM +0800, zhaoyang.huang wrote:
> Mirsad report bellow error which caused by stack_depot_init failed in kvcalloc.
> Solve this by having stackdepot use stack_depot_early_init.
[...]
> diff --git a/mm/kmemleak.c b/mm/kmemleak.c
> index 762b91f..ddc1ddf 100644
> --- a/mm/kmemleak.c
> +++ b/mm/kmemleak.c
> @@ -2070,8 +2070,10 @@ static int __init kmemleak_boot_config(char *str)
>  		return -EINVAL;
>  	if (strcmp(str, "off") == 0)
>  		kmemleak_disable();
> -	else if (strcmp(str, "on") == 0)
> +	else if (strcmp(str, "on") == 0) {
>  		kmemleak_skip_disable = 1;
> +		stack_depot_want_early_init();
> +	}

Does this fix still work if kmemleak is default on and no option passed
on the kernel command line? I thought we also need something like:

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 881c3f84e88a..80c69d026890 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -754,6 +754,7 @@ config DEBUG_KMEMLEAK
 	select KALLSYMS
 	select CRC32
 	select STACKDEPOT
+	select STACKDEPOT_ALWAYS_INIT if !DEBUG_KMEMLEAK_DEFAULT_OFF
 	help
 	  Say Y here if you want to enable the memory leak
 	  detector. The memory allocation/freeing is traced in a way

-- 
Catalin