linux-kernel - Re: [PATCH v2 2/2] mm/vmalloc: Print a warning message first on failure

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Message-ID: <20210509194643.GA2999@pc638.lan>
Date:   Sun, 9 May 2021 21:46:43 +0200
From:   Uladzislau Rezki <urezki@...il.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        LKML <linux-kernel@...r.kernel.org>,
        Matthew Wilcox <willy@...radead.org>,
        Nicholas Piggin <npiggin@...il.com>,
        Mel Gorman <mgorman@...e.de>, Hillf Danton <hdanton@...a.com>,
        Michal Hocko <mhocko@...e.com>,
        Oleksiy Avramchenko <oleksiy.avramchenko@...ymobile.com>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH v2 2/2] mm/vmalloc: Print a warning message first on
 failure

> When a memory allocation for array of pages are not succeed
> emit a warning message as a first step and then perform the
> further cleanup.
> 
> Signed-off-by: Uladzislau Rezki (Sony) <urezki@...il.com>
> ---
>  Makefile     | 2 +-
>  mm/vmalloc.c | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/Makefile b/Makefile
> index bb50a5ac2e13..1d658e171495 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -430,7 +430,7 @@ HOSTCXX	= g++
>  endif
>  
>  export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \
> -			      -O2 -fomit-frame-pointer -std=gnu89
> +			      -O0 -g -fomit-frame-pointer -std=gnu89
>  export KBUILD_USERLDFLAGS :=
>  
>  KBUILD_HOSTCFLAGS   := $(KBUILD_USERCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS)
> diff --git a/mm/vmalloc.c b/mm/vmalloc.c
> index dbc6744400d5..1f664a17d9ea 100644
> --- a/mm/vmalloc.c
> +++ b/mm/vmalloc.c
> @@ -2781,11 +2781,11 @@ static void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask,
>  	}
>  
>  	if (!area->pages) {
> -		free_vm_area(area);
>  		warn_alloc(gfp_mask, NULL,
>  			   "vmalloc size %lu allocation failure: "
>  			   "page array size %lu allocation failed",
>  			   nr_small_pages * PAGE_SIZE, array_size);
> +		free_vm_area(area);
>  		return NULL;
>  	}
>  
> -- 
> 2.20.1
> 
Please consider a V3 of this patch. Apparently a modification of
Makefile was included in the patch. What is wrong :)

>From 9c484d83a630c4430dcb055a26c879d8e3c5cae1 Mon Sep 17 00:00:00 2001
From: "Uladzislau Rezki (Sony)" <urezki@...il.com>
Date: Sat, 8 May 2021 23:41:21 +0200
Subject: [PATCH v3 2/2] mm/vmalloc: Print a warning message first on failure

When a memory allocation for array of pages are not succeed
emit a warning message as a first step and then perform the
further cleanup.

Signed-off-by: Uladzislau Rezki (Sony) <urezki@...il.com>
---
 mm/vmalloc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index dbc6744400d5..1f664a17d9ea 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -2781,11 +2781,11 @@ static void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask,
 	}
 
 	if (!area->pages) {
-		free_vm_area(area);
 		warn_alloc(gfp_mask, NULL,
 			   "vmalloc size %lu allocation failure: "
 			   "page array size %lu allocation failed",
 			   nr_small_pages * PAGE_SIZE, array_size);
+		free_vm_area(area);
 		return NULL;
 	}
 
-- 
2.20.1

--
Vlad Rezki