Re: [PATCH v2 2/8] crash_core: change the prototype of function parse_crashkernel()

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On 2023/8/29 20:16, Baoquan He wrote:
> Add two parameters 'low_size' and 'high' to function parse_crashkernel(),
> later crashkernel=,high|low parsing will be added. Make adjustments in all
> call sites of parse_crashkernel() in arch.

Reviewed-by: Zhen Lei <thunder.leizhen@xxxxxxxxxx>

> 
> Signed-off-by: Baoquan He <bhe@xxxxxxxxxx>
> ---
>  arch/arm/kernel/setup.c              |  3 ++-
>  arch/arm64/mm/init.c                 |  2 +-
>  arch/ia64/kernel/setup.c             |  2 +-
>  arch/loongarch/kernel/setup.c        |  4 +++-
>  arch/mips/kernel/setup.c             |  3 ++-
>  arch/powerpc/kernel/fadump.c         |  2 +-
>  arch/powerpc/kexec/core.c            |  2 +-
>  arch/powerpc/mm/nohash/kaslr_booke.c |  2 +-
>  arch/riscv/mm/init.c                 |  2 +-
>  arch/s390/kernel/setup.c             |  4 ++--
>  arch/sh/kernel/machine_kexec.c       |  2 +-
>  arch/x86/kernel/setup.c              |  3 ++-
>  include/linux/crash_core.h           |  3 ++-
>  kernel/crash_core.c                  | 15 ++++++++++++---
>  14 files changed, 32 insertions(+), 17 deletions(-)
> 
> diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
> index c66b560562b3..e2bb7afd0683 100644
> --- a/arch/arm/kernel/setup.c
> +++ b/arch/arm/kernel/setup.c
> @@ -1010,7 +1010,8 @@ static void __init reserve_crashkernel(void)
>  
>  	total_mem = get_total_mem();
>  	ret = parse_crashkernel(boot_command_line, total_mem,
> -				&crash_size, &crash_base);
> +				&crash_size, &crash_base,
> +				NULL, NULL);
>  	/* invalid value specified or crashkernel=0 */
>  	if (ret || !crash_size)
>  		return;
> diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
> index 4fcb88a445ef..4ad637508b75 100644
> --- a/arch/arm64/mm/init.c
> +++ b/arch/arm64/mm/init.c
> @@ -142,7 +142,7 @@ static void __init reserve_crashkernel(void)
>  
>  	/* crashkernel=X[@offset] */
>  	ret = parse_crashkernel(cmdline, memblock_phys_mem_size(),
> -				&crash_size, &crash_base);
> +				&crash_size, &crash_base, NULL, NULL);
>  	if (ret == -ENOENT) {
>  		ret = parse_crashkernel_high(cmdline, 0, &crash_size, &crash_base);
>  		if (ret || !crash_size)
> diff --git a/arch/ia64/kernel/setup.c b/arch/ia64/kernel/setup.c
> index 5a55ac82c13a..4faea2d2cf07 100644
> --- a/arch/ia64/kernel/setup.c
> +++ b/arch/ia64/kernel/setup.c
> @@ -277,7 +277,7 @@ static void __init setup_crashkernel(unsigned long total, int *n)
>  	int ret;
>  
>  	ret = parse_crashkernel(boot_command_line, total,
> -			&size, &base);
> +			&size, &base, NULL, NULL);
>  	if (ret == 0 && size > 0) {
>  		if (!base) {
>  			sort_regions(rsvd_region, *n);
> diff --git a/arch/loongarch/kernel/setup.c b/arch/loongarch/kernel/setup.c
> index 9d830ab4e302..776a068d8718 100644
> --- a/arch/loongarch/kernel/setup.c
> +++ b/arch/loongarch/kernel/setup.c
> @@ -267,7 +267,9 @@ static void __init arch_parse_crashkernel(void)
>  	unsigned long long crash_base, crash_size;
>  
>  	total_mem = memblock_phys_mem_size();
> -	ret = parse_crashkernel(boot_command_line, total_mem, &crash_size, &crash_base);
> +	ret = parse_crashkernel(boot_command_line, total_mem,
> +				&crash_size, &crash_base,
> +				NULL, NULL);
>  	if (ret < 0 || crash_size <= 0)
>  		return;
>  
> diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
> index cb871eb784a7..08321c945ac4 100644
> --- a/arch/mips/kernel/setup.c
> +++ b/arch/mips/kernel/setup.c
> @@ -460,7 +460,8 @@ static void __init mips_parse_crashkernel(void)
>  
>  	total_mem = memblock_phys_mem_size();
>  	ret = parse_crashkernel(boot_command_line, total_mem,
> -				&crash_size, &crash_base);
> +				&crash_size, &crash_base,
> +				NULL, NULL);
>  	if (ret != 0 || crash_size <= 0)
>  		return;
>  
> diff --git a/arch/powerpc/kernel/fadump.c b/arch/powerpc/kernel/fadump.c
> index ea0a073abd96..7dbdeba56e74 100644
> --- a/arch/powerpc/kernel/fadump.c
> +++ b/arch/powerpc/kernel/fadump.c
> @@ -313,7 +313,7 @@ static __init u64 fadump_calculate_reserve_size(void)
>  	 * memory at a predefined offset.
>  	 */
>  	ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(),
> -				&size, &base);
> +				&size, &base, NULL, NULL);
>  	if (ret == 0 && size > 0) {
>  		unsigned long max_size;
>  
> diff --git a/arch/powerpc/kexec/core.c b/arch/powerpc/kexec/core.c
> index de64c7962991..9346c960b296 100644
> --- a/arch/powerpc/kexec/core.c
> +++ b/arch/powerpc/kexec/core.c
> @@ -109,7 +109,7 @@ void __init reserve_crashkernel(void)
>  	total_mem_sz = memory_limit ? memory_limit : memblock_phys_mem_size();
>  	/* use common parsing */
>  	ret = parse_crashkernel(boot_command_line, total_mem_sz,
> -			&crash_size, &crash_base);
> +			&crash_size, &crash_base, NULL, NULL);
>  	if (ret == 0 && crash_size > 0) {
>  		crashk_res.start = crash_base;
>  		crashk_res.end = crash_base + crash_size - 1;
> diff --git a/arch/powerpc/mm/nohash/kaslr_booke.c b/arch/powerpc/mm/nohash/kaslr_booke.c
> index 2fb3edafe9ab..b4f2786a7d2b 100644
> --- a/arch/powerpc/mm/nohash/kaslr_booke.c
> +++ b/arch/powerpc/mm/nohash/kaslr_booke.c
> @@ -178,7 +178,7 @@ static void __init get_crash_kernel(void *fdt, unsigned long size)
>  	int ret;
>  
>  	ret = parse_crashkernel(boot_command_line, size, &crash_size,
> -				&crash_base);
> +				&crash_base, NULL, NULL);
>  	if (ret != 0 || crash_size == 0)
>  		return;
>  	if (crash_base == 0)
> diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
> index e4c35ac2357f..a9ef0824f905 100644
> --- a/arch/riscv/mm/init.c
> +++ b/arch/riscv/mm/init.c
> @@ -1332,7 +1332,7 @@ static void __init reserve_crashkernel(void)
>  	}
>  
>  	ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(),
> -				&crash_size, &crash_base);
> +				&crash_size, &crash_base, NULL, NULL);
>  	if (ret || !crash_size)
>  		return;
>  
> diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
> index c744104e4a9c..98204a5f62b1 100644
> --- a/arch/s390/kernel/setup.c
> +++ b/arch/s390/kernel/setup.c
> @@ -626,8 +626,8 @@ static void __init reserve_crashkernel(void)
>  	phys_addr_t low, high;
>  	int rc;
>  
> -	rc = parse_crashkernel(boot_command_line, ident_map_size, &crash_size,
> -			       &crash_base);
> +	rc = parse_crashkernel(boot_command_line, ident_map_size,
> +			       &crash_size, &crash_base, NULL, NULL);
>  
>  	crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN);
>  	crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN);
> diff --git a/arch/sh/kernel/machine_kexec.c b/arch/sh/kernel/machine_kexec.c
> index 223c14f44af7..fa3a7b36190a 100644
> --- a/arch/sh/kernel/machine_kexec.c
> +++ b/arch/sh/kernel/machine_kexec.c
> @@ -154,7 +154,7 @@ void __init reserve_crashkernel(void)
>  	int ret;
>  
>  	ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(),
> -			&crash_size, &crash_base);
> +			&crash_size, &crash_base, NULL, NULL);
>  	if (ret == 0 && crash_size > 0) {
>  		crashk_res.start = crash_base;
>  		crashk_res.end = crash_base + crash_size - 1;
> diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
> index fd975a4a5200..382c66d2cf71 100644
> --- a/arch/x86/kernel/setup.c
> +++ b/arch/x86/kernel/setup.c
> @@ -558,7 +558,8 @@ static void __init reserve_crashkernel(void)
>  	total_mem = memblock_phys_mem_size();
>  
>  	/* crashkernel=XM */
> -	ret = parse_crashkernel(boot_command_line, total_mem, &crash_size, &crash_base);
> +	ret = parse_crashkernel(boot_command_line, total_mem,
> +				&crash_size, &crash_base, NULL, NULL);
>  	if (ret != 0 || crash_size <= 0) {
>  		/* crashkernel=X,high */
>  		ret = parse_crashkernel_high(boot_command_line, total_mem,
> diff --git a/include/linux/crash_core.h b/include/linux/crash_core.h
> index de62a722431e..2e76289699ff 100644
> --- a/include/linux/crash_core.h
> +++ b/include/linux/crash_core.h
> @@ -78,7 +78,8 @@ Elf_Word *append_elf_note(Elf_Word *buf, char *name, unsigned int type,
>  void final_note(Elf_Word *buf);
>  
>  int __init parse_crashkernel(char *cmdline, unsigned long long system_ram,
> -		unsigned long long *crash_size, unsigned long long *crash_base);
> +		unsigned long long *crash_size, unsigned long long *crash_base,
> +		unsigned long long *low_size, bool *high);
>  int parse_crashkernel_high(char *cmdline, unsigned long long system_ram,
>  		unsigned long long *crash_size, unsigned long long *crash_base);
>  int parse_crashkernel_low(char *cmdline, unsigned long long system_ram,
> diff --git a/kernel/crash_core.c b/kernel/crash_core.c
> index f27b4e45d410..f6a5c219e2e1 100644
> --- a/kernel/crash_core.c
> +++ b/kernel/crash_core.c
> @@ -280,10 +280,19 @@ static int __init __parse_crashkernel(char *cmdline,
>  int __init parse_crashkernel(char *cmdline,
>  			     unsigned long long system_ram,
>  			     unsigned long long *crash_size,
> -			     unsigned long long *crash_base)
> +			     unsigned long long *crash_base,
> +			     unsigned long long *low_size,
> +			     bool *high)
>  {
> -	return __parse_crashkernel(cmdline, system_ram, crash_size, crash_base,
> -				NULL);
> +	int ret;
> +
> +	/* crashkernel=X[@offset] */
> +	ret = __parse_crashkernel(cmdline, system_ram, crash_size,
> +				crash_base, NULL);
> +	if (!high)
> +		return ret;
> +
> +	return 0;
>  }
>  
>  int __init parse_crashkernel_high(char *cmdline,
> 

-- 
Regards,
  Zhen Lei


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