linux-kernel - Re: [PATCH v1 05/11] fs/proc/vmcore: factor out allocating a vmcore memory node

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Message-ID: <Zz2vnl1HQOC6vF20@MiWiFi-R3L-srv>
Date: Wed, 20 Nov 2024 17:45:02 +0800
From: Baoquan He <bhe@...hat.com>
To: David Hildenbrand <david@...hat.com>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-s390@...r.kernel.org, virtualization@...ts.linux.dev,
	kvm@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	kexec@...ts.infradead.org, Heiko Carstens <hca@...ux.ibm.com>,
	Vasily Gorbik <gor@...ux.ibm.com>,
	Alexander Gordeev <agordeev@...ux.ibm.com>,
	Christian Borntraeger <borntraeger@...ux.ibm.com>,
	Sven Schnelle <svens@...ux.ibm.com>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Jason Wang <jasowang@...hat.com>,
	Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
	Eugenio Pérez <eperezma@...hat.com>,
	Vivek Goyal <vgoyal@...hat.com>, Dave Young <dyoung@...hat.com>,
	Thomas Huth <thuth@...hat.com>, Cornelia Huck <cohuck@...hat.com>,
	Janosch Frank <frankja@...ux.ibm.com>,
	Claudio Imbrenda <imbrenda@...ux.ibm.com>,
	Eric Farman <farman@...ux.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v1 05/11] fs/proc/vmcore: factor out allocating a vmcore
 memory node

On 10/25/24 at 05:11pm, David Hildenbrand wrote:
> Let's factor it out into include/linux/crash_dump.h, from where we can
> use it also outside of vmcore.c later.

LGTM,

Acked-by: Baoquan He <bhe@...hat.com>

> 
> Signed-off-by: David Hildenbrand <david@...hat.com>
> ---
>  fs/proc/vmcore.c           | 21 ++-------------------
>  include/linux/crash_dump.h | 14 ++++++++++++++
>  2 files changed, 16 insertions(+), 19 deletions(-)
> 
> diff --git a/fs/proc/vmcore.c b/fs/proc/vmcore.c
> index 47652df95202..76fdc3fb8c0e 100644
> --- a/fs/proc/vmcore.c
> +++ b/fs/proc/vmcore.c
> @@ -683,11 +683,6 @@ static const struct proc_ops vmcore_proc_ops = {
>  	.proc_mmap	= mmap_vmcore,
>  };
>  
> -static struct vmcore_mem_node * __init get_new_element(void)
> -{
> -	return kzalloc(sizeof(struct vmcore_mem_node), GFP_KERNEL);
> -}
> -
>  static u64 get_vmcore_size(size_t elfsz, size_t elfnotesegsz,
>  			   struct list_head *vc_list)
>  {
> @@ -1090,7 +1085,6 @@ static int __init process_ptload_program_headers_elf64(char *elfptr,
>  						size_t elfnotes_sz,
>  						struct list_head *vc_list)
>  {
> -	struct vmcore_mem_node *new;
>  	int i;
>  	Elf64_Ehdr *ehdr_ptr;
>  	Elf64_Phdr *phdr_ptr;
> @@ -1113,13 +1107,8 @@ static int __init process_ptload_program_headers_elf64(char *elfptr,
>  		end = roundup(paddr + phdr_ptr->p_memsz, PAGE_SIZE);
>  		size = end - start;
>  
> -		/* Add this contiguous chunk of memory to vmcore list.*/
> -		new = get_new_element();
> -		if (!new)
> +		if (vmcore_alloc_add_mem_node(vc_list, start, size))
>  			return -ENOMEM;
> -		new->paddr = start;
> -		new->size = size;
> -		list_add_tail(&new->list, vc_list);
>  
>  		/* Update the program header offset. */
>  		phdr_ptr->p_offset = vmcore_off + (paddr - start);
> @@ -1133,7 +1122,6 @@ static int __init process_ptload_program_headers_elf32(char *elfptr,
>  						size_t elfnotes_sz,
>  						struct list_head *vc_list)
>  {
> -	struct vmcore_mem_node *new;
>  	int i;
>  	Elf32_Ehdr *ehdr_ptr;
>  	Elf32_Phdr *phdr_ptr;
> @@ -1156,13 +1144,8 @@ static int __init process_ptload_program_headers_elf32(char *elfptr,
>  		end = roundup(paddr + phdr_ptr->p_memsz, PAGE_SIZE);
>  		size = end - start;
>  
> -		/* Add this contiguous chunk of memory to vmcore list.*/
> -		new = get_new_element();
> -		if (!new)
> +		if (vmcore_alloc_add_mem_node(vc_list, start, size))
>  			return -ENOMEM;
> -		new->paddr = start;
> -		new->size = size;
> -		list_add_tail(&new->list, vc_list);
>  
>  		/* Update the program header offset */
>  		phdr_ptr->p_offset = vmcore_off + (paddr - start);
> diff --git a/include/linux/crash_dump.h b/include/linux/crash_dump.h
> index 5e48ab12c12b..ae77049fc023 100644
> --- a/include/linux/crash_dump.h
> +++ b/include/linux/crash_dump.h
> @@ -121,6 +121,20 @@ struct vmcore_mem_node {
>  	loff_t offset;
>  };
>  
> +/* Allocate a vmcore memory node and add it to the list. */
> +static inline int vmcore_alloc_add_mem_node(struct list_head *list,
> +		unsigned long long paddr, unsigned long long size)
> +{
> +	struct vmcore_mem_node *m = kzalloc(sizeof(*m), GFP_KERNEL);
> +
> +	if (!m)
> +		return -ENOMEM;
> +	m->paddr = paddr;
> +	m->size = size;
> +	list_add_tail(&m->list, list);
> +	return 0;
> +}
> +
>  #else /* !CONFIG_CRASH_DUMP */
>  static inline bool is_kdump_kernel(void) { return false; }
>  #endif /* CONFIG_CRASH_DUMP */
> -- 
> 2.46.1
>