linux-kernel - Re: [PATCH v3 5/7] kexec_file, ricv: print out debugging message if required

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Message-ID: <20231201-blog-blasphemy-985d2665903c@wendy>
Date:   Fri, 1 Dec 2023 10:38:13 +0000
From:   Conor Dooley <conor.dooley@...rochip.com>
To:     Baoquan He <bhe@...hat.com>
CC:     <linux-kernel@...r.kernel.org>, <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>,
        <joe@...ches.com>, <nathan@...nel.org>
Subject: Re: [PATCH v3 5/7] kexec_file, ricv: print out debugging message if
 required

On Thu, Nov 30, 2023 at 10:39:53AM +0800, Baoquan He wrote:

$subject has a typo in the arch bit :)

> Replace pr_debug() with the newly added kexec_dprintk() in kexec_file
> loading related codes.

Commit messages should be understandable in isolation, but this only
explains (part of) what is obvious in the diff. Why is this change
being made?

> 
> And also remove kexec_image_info() because the content has been printed
> out in generic code.
> 
> Signed-off-by: Baoquan He <bhe@...hat.com>
> ---
>  arch/riscv/kernel/elf_kexec.c     | 11 ++++++-----
>  arch/riscv/kernel/machine_kexec.c | 26 --------------------------
>  2 files changed, 6 insertions(+), 31 deletions(-)
> 
> diff --git a/arch/riscv/kernel/elf_kexec.c b/arch/riscv/kernel/elf_kexec.c
> index e60fbd8660c4..5bd1ec3341fe 100644
> --- a/arch/riscv/kernel/elf_kexec.c
> +++ b/arch/riscv/kernel/elf_kexec.c
> @@ -216,7 +216,6 @@ static void *elf_kexec_load(struct kimage *image, char *kernel_buf,
>  	if (ret)
>  		goto out;
>  	kernel_start = image->start;
> -	pr_notice("The entry point of kernel at 0x%lx\n", image->start);
>  
>  	/* Add the kernel binary to the image */
>  	ret = riscv_kexec_elf_load(image, &ehdr, &elf_info,
> @@ -252,8 +251,8 @@ static void *elf_kexec_load(struct kimage *image, char *kernel_buf,
>  		image->elf_load_addr = kbuf.mem;
>  		image->elf_headers_sz = headers_sz;
>  
> -		pr_debug("Loaded elf core header at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
> -			 image->elf_load_addr, kbuf.bufsz, kbuf.memsz);
> +		kexec_dprintk("Loaded elf core header at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
> +			      image->elf_load_addr, kbuf.bufsz, kbuf.memsz);
>  
>  		/* Setup cmdline for kdump kernel case */
>  		modified_cmdline = setup_kdump_cmdline(image, cmdline,
> @@ -275,6 +274,8 @@ static void *elf_kexec_load(struct kimage *image, char *kernel_buf,
>  		pr_err("Error loading purgatory ret=%d\n", ret);
>  		goto out;
>  	}
> +	kexec_dprintk("Loaded purgatory at 0x%lx\n", kbuf.mem);
> +
>  	ret = kexec_purgatory_get_set_symbol(image, "riscv_kernel_entry",
>  					     &kernel_start,
>  					     sizeof(kernel_start), 0);
> @@ -293,7 +294,7 @@ static void *elf_kexec_load(struct kimage *image, char *kernel_buf,
>  		if (ret)
>  			goto out;
>  		initrd_pbase = kbuf.mem;

> -		pr_notice("Loaded initrd at 0x%lx\n", initrd_pbase);
> +		kexec_dprintk("Loaded initrd at 0x%lx\n", initrd_pbase);

This is not a pr_debug().

>  	}
>  
>  	/* Add the DTB to the image */
> @@ -318,7 +319,7 @@ static void *elf_kexec_load(struct kimage *image, char *kernel_buf,
>  	}
>  	/* Cache the fdt buffer address for memory cleanup */
>  	image->arch.fdt = fdt;

> -	pr_notice("Loaded device tree at 0x%lx\n", kbuf.mem);
> +	kexec_dprintk("Loaded device tree at 0x%lx\n", kbuf.mem);

Neither is this. Why are they being moved from pr_notice()?

Thanks,
Conor.

>  	goto out;
>  
>  out_free_fdt:
> diff --git a/arch/riscv/kernel/machine_kexec.c b/arch/riscv/kernel/machine_kexec.c
> index 2d139b724bc8..ed9cad20c039 100644
> --- a/arch/riscv/kernel/machine_kexec.c
> +++ b/arch/riscv/kernel/machine_kexec.c
> @@ -18,30 +18,6 @@
>  #include <linux/interrupt.h>
>  #include <linux/irq.h>
>  
> -/*
> - * kexec_image_info - Print received image details
> - */
> -static void
> -kexec_image_info(const struct kimage *image)
> -{
> -	unsigned long i;
> -
> -	pr_debug("Kexec image info:\n");
> -	pr_debug("\ttype:        %d\n", image->type);
> -	pr_debug("\tstart:       %lx\n", image->start);
> -	pr_debug("\thead:        %lx\n", image->head);
> -	pr_debug("\tnr_segments: %lu\n", image->nr_segments);
> -
> -	for (i = 0; i < image->nr_segments; i++) {
> -		pr_debug("\t    segment[%lu]: %016lx - %016lx", i,
> -			image->segment[i].mem,
> -			image->segment[i].mem + image->segment[i].memsz);
> -		pr_debug("\t\t0x%lx bytes, %lu pages\n",
> -			(unsigned long) image->segment[i].memsz,
> -			(unsigned long) image->segment[i].memsz /  PAGE_SIZE);
> -	}
> -}
> -
>  /*
>   * machine_kexec_prepare - Initialize kexec
>   *
> @@ -60,8 +36,6 @@ machine_kexec_prepare(struct kimage *image)
>  	unsigned int control_code_buffer_sz = 0;
>  	int i = 0;
>  
> -	kexec_image_info(image);
> -
>  	/* Find the Flattened Device Tree and save its physical address */
>  	for (i = 0; i < image->nr_segments; i++) {
>  		if (image->segment[i].memsz <= sizeof(fdt))
> -- 
> 2.41.0
> 

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