linux-kernel - Re: [PATCH v2 2/7] kexec_file: print out debugging message if required

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Message-ID: <971ed2ceaeeba882d2b4c39015ee5ae5db3f5e82.camel@perches.com>
Date:   Thu, 23 Nov 2023 23:16:46 -0800
From:   Joe Perches <joe@...ches.com>
To:     Baoquan He <bhe@...hat.com>, linux-kernel@...r.kernel.org
Cc:     kexec@...ts.infradead.org, x86@...nel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-riscv@...ts.infradead.org, linuxppc-dev@...ts.ozlabs.org,
        linux-parisc@...r.kernel.org, akpm@...ux-foundation.org,
        nathan@...nel.org, yujie.liu@...el.com
Subject: Re: [PATCH v2 2/7] kexec_file: print out debugging message if
 required

On Fri, 2023-11-24 at 11:36 +0800, Baoquan He wrote:
> Replace pr_debug() with the newly added kexec_dprintk() in kexec_file
> loading related codes.

trivia for pr_debug -> kexec_dprintk conversions for
the entire patch set:

> diff --git a/kernel/crash_core.c b/kernel/crash_core.c
[]
> @@ -551,9 +551,12 @@ int crash_prepare_elf64_headers(struct crash_mem *mem, int need_kernel_map,
>  		phdr->p_filesz = phdr->p_memsz = mend - mstart + 1;
>  		phdr->p_align = 0;
>  		ehdr->e_phnum++;
> -		pr_debug("Crash PT_LOAD ELF header. phdr=%p vaddr=0x%llx, paddr=0x%llx, sz=0x%llx e_phnum=%d p_offset=0x%llx\n",
> +#ifdef CONFIG_KEXEC_FILE
> +		kexec_dprintk("Crash PT_LOAD ELF header. phdr=%p vaddr=0x%llx, paddr=0x%llx, "
> +			"sz=0x%llx e_phnum=%d p_offset=0x%llx\n",
>  			phdr, phdr->p_vaddr, phdr->p_paddr, phdr->p_filesz,
>  			ehdr->e_phnum, phdr->p_offset);

It's good form to rewrap continuation lines to the open parenthesis

> diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c
[]
> @@ -389,11 +391,12 @@ SYSCALL_DEFINE5(kexec_file_load, int, kernel_fd, int, initrd_fd,
>  	if (ret)
>  		goto out;
>  
> +	kexec_dprintk("nr_segments = %lu\n", image->nr_segments);
>  	for (i = 0; i < image->nr_segments; i++) {
>  		struct kexec_segment *ksegment;
>  
>  		ksegment = &image->segment[i];
> -		pr_debug("Loading segment %d: buf=0x%p bufsz=0x%zx mem=0x%lx memsz=0x%zx\n",
> +		kexec_dprintk("segment[%d]: buf=0x%p bufsz=0x%zx mem=0x%lx memsz=0x%zx\n",
>  			 i, ksegment->buf, ksegment->bufsz, ksegment->mem,
>  			 ksegment->memsz);

here too etc...