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Date:   Thu, 14 Jan 2021 18:33:03 -0800 (PST)
From:   Palmer Dabbelt <palmer@...belt.com>
To:     wangkefeng.wang@...wei.com
CC:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-riscv@...ts.infradead.org, linux@...linux.org.uk,
        Atish Patra <Atish.Patra@....com>, guoren@...nel.org,
        Paul Walmsley <paul.walmsley@...ive.com>,
        wangkefeng.wang@...wei.com
Subject:     Re: [PATCH v2] initramfs: Provide a common initrd reserve function

On Wed, 13 Jan 2021 18:33:58 PST (-0800), wangkefeng.wang@...wei.com wrote:
> The ARM and riscv have same logic to check and reserve
> the memory of initrd, let's provide a common function to
> reduce duplicated code.
>
> Add __LINUX_INITRD_H define in initrd.h to prevent build error
> (found by kernel test robot <lkp@...el.com>) from the multiple
> inclusion of same header file multiple time.

This is doing a bunch of different things:

* Fixing the lack of a preprocessor guard in initrd.h
* Adding some generic code.
* Converting two architectures over to that generic code.

It needs to be split into four patches.  I'm happy to take them via the RISC-V 
tree (with an Ack from for the arch/arm/ stuff), but not all together.

It looks like csky copied this as well, they at least have exactly the same 
message.

> Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
> ---
> v2: fix build err
>
>  arch/arm/mm/init.c     | 43 +---------------------------------
>  arch/riscv/mm/init.c   | 53 +-----------------------------------------
>  include/linux/initrd.h | 11 +++++++++
>  init/initramfs.c       | 45 +++++++++++++++++++++++++++++++++++
>  4 files changed, 58 insertions(+), 94 deletions(-)
>
> diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c
> index 828a2561b229..a29e14cd626c 100644
> --- a/arch/arm/mm/init.c
> +++ b/arch/arm/mm/init.c
> @@ -153,47 +153,6 @@ phys_addr_t __init arm_memblock_steal(phys_addr_t size, phys_addr_t align)
>  	return phys;
>  }
>
> -static void __init arm_initrd_init(void)
> -{
> -#ifdef CONFIG_BLK_DEV_INITRD
> -	phys_addr_t start;
> -	unsigned long size;
> -
> -	initrd_start = initrd_end = 0;
> -
> -	if (!phys_initrd_size)
> -		return;
> -
> -	/*
> -	 * Round the memory region to page boundaries as per free_initrd_mem()
> -	 * This allows us to detect whether the pages overlapping the initrd
> -	 * are in use, but more importantly, reserves the entire set of pages
> -	 * as we don't want these pages allocated for other purposes.
> -	 */
> -	start = round_down(phys_initrd_start, PAGE_SIZE);
> -	size = phys_initrd_size + (phys_initrd_start - start);
> -	size = round_up(size, PAGE_SIZE);
> -
> -	if (!memblock_is_region_memory(start, size)) {
> -		pr_err("INITRD: 0x%08llx+0x%08lx is not a memory region - disabling initrd\n",
> -		       (u64)start, size);
> -		return;
> -	}
> -
> -	if (memblock_is_region_reserved(start, size)) {
> -		pr_err("INITRD: 0x%08llx+0x%08lx overlaps in-use memory region - disabling initrd\n",
> -		       (u64)start, size);
> -		return;
> -	}
> -
> -	memblock_reserve(start, size);
> -
> -	/* Now convert initrd to virtual addresses */
> -	initrd_start = __phys_to_virt(phys_initrd_start);
> -	initrd_end = initrd_start + phys_initrd_size;
> -#endif
> -}
> -
>  #ifdef CONFIG_CPU_ICACHE_MISMATCH_WORKAROUND
>  void check_cpu_icache_size(int cpuid)
>  {
> @@ -215,7 +174,7 @@ void __init arm_memblock_init(const struct machine_desc *mdesc)
>  	/* Register the kernel text, kernel data and initrd with memblock. */
>  	memblock_reserve(__pa(KERNEL_START), KERNEL_END - KERNEL_START);
>
> -	arm_initrd_init();
> +	reserve_initrd_mem();
>
>  	arm_mm_memblock_reserve();
>
> diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
> index da53902ef0fc..93cba0d3f43f 100644
> --- a/arch/riscv/mm/init.c
> +++ b/arch/riscv/mm/init.c
> @@ -105,55 +105,6 @@ void __init mem_init(void)
>  	print_vm_layout();
>  }
>
> -#ifdef CONFIG_BLK_DEV_INITRD
> -static void __init setup_initrd(void)
> -{
> -	phys_addr_t start;
> -	unsigned long size;
> -
> -	/* Ignore the virtul address computed during device tree parsing */
> -	initrd_start = initrd_end = 0;
> -
> -	if (!phys_initrd_size)
> -		return;
> -	/*
> -	 * Round the memory region to page boundaries as per free_initrd_mem()
> -	 * This allows us to detect whether the pages overlapping the initrd
> -	 * are in use, but more importantly, reserves the entire set of pages
> -	 * as we don't want these pages allocated for other purposes.
> -	 */
> -	start = round_down(phys_initrd_start, PAGE_SIZE);
> -	size = phys_initrd_size + (phys_initrd_start - start);
> -	size = round_up(size, PAGE_SIZE);
> -
> -	if (!memblock_is_region_memory(start, size)) {
> -		pr_err("INITRD: 0x%08llx+0x%08lx is not a memory region",
> -		       (u64)start, size);
> -		goto disable;
> -	}
> -
> -	if (memblock_is_region_reserved(start, size)) {
> -		pr_err("INITRD: 0x%08llx+0x%08lx overlaps in-use memory region\n",
> -		       (u64)start, size);
> -		goto disable;
> -	}
> -
> -	memblock_reserve(start, size);
> -	/* Now convert initrd to virtual addresses */
> -	initrd_start = (unsigned long)__va(phys_initrd_start);
> -	initrd_end = initrd_start + phys_initrd_size;
> -	initrd_below_start_ok = 1;
> -
> -	pr_info("Initial ramdisk at: 0x%p (%lu bytes)\n",
> -		(void *)(initrd_start), size);
> -	return;
> -disable:
> -	pr_cont(" - disabling initrd\n");
> -	initrd_start = 0;
> -	initrd_end = 0;
> -}
> -#endif /* CONFIG_BLK_DEV_INITRD */
> -
>  void __init setup_bootmem(void)
>  {
>  	phys_addr_t mem_start = 0;
> @@ -198,9 +149,7 @@ void __init setup_bootmem(void)
>  	dma32_phys_limit = min(4UL * SZ_1G, (unsigned long)PFN_PHYS(max_low_pfn));
>  	set_max_mapnr(max_low_pfn);
>
> -#ifdef CONFIG_BLK_DEV_INITRD
> -	setup_initrd();
> -#endif /* CONFIG_BLK_DEV_INITRD */
> +	reserve_initrd_mem();
>
>  	/*
>  	 * Avoid using early_init_fdt_reserve_self() since __pa() does
> diff --git a/include/linux/initrd.h b/include/linux/initrd.h
> index 8db6f8c8030b..85c15717af34 100644
> --- a/include/linux/initrd.h
> +++ b/include/linux/initrd.h
> @@ -1,5 +1,8 @@
>  /* SPDX-License-Identifier: GPL-2.0 */
>
> +#ifndef __LINUX_INITRD_H
> +#define __LINUX_INITRD_H
> +
>  #define INITRD_MINOR 250 /* shouldn't collide with /dev/ram* too soon ... */
>
>  /* starting block # of image */
> @@ -15,6 +18,12 @@ extern int initrd_below_start_ok;
>  extern unsigned long initrd_start, initrd_end;
>  extern void free_initrd_mem(unsigned long, unsigned long);
>
> +#ifdef CONFIG_BLK_DEV_INITRD
> +extern void __init reserve_initrd_mem(void);
> +#else
> +static inline void __init reserve_initrd_mem(void) {}
> +#endif
> +
>  extern phys_addr_t phys_initrd_start;
>  extern unsigned long phys_initrd_size;
>
> @@ -24,3 +33,5 @@ extern char __initramfs_start[];
>  extern unsigned long __initramfs_size;
>
>  void console_on_rootfs(void);
> +
> +#endif /* __LINUX_INITRD_H */
> diff --git a/init/initramfs.c b/init/initramfs.c
> index 55b74d7e5260..f75c89e9d602 100644
> --- a/init/initramfs.c
> +++ b/init/initramfs.c
> @@ -535,6 +535,51 @@ extern unsigned long __initramfs_size;
>  #include <linux/initrd.h>
>  #include <linux/kexec.h>
>
> +void __init reserve_initrd_mem(void)
> +{
> +	phys_addr_t start;
> +	unsigned long size;
> +
> +	/* Ignore the virtul address computed during device tree parsing */
> +	initrd_start = initrd_end = 0;
> +
> +	if (!phys_initrd_size)
> +		return;
> +	/*
> +	 * Round the memory region to page boundaries as per free_initrd_mem()
> +	 * This allows us to detect whether the pages overlapping the initrd
> +	 * are in use, but more importantly, reserves the entire set of pages
> +	 * as we don't want these pages allocated for other purposes.
> +	 */
> +	start = round_down(phys_initrd_start, PAGE_SIZE);
> +	size = phys_initrd_size + (phys_initrd_start - start);
> +	size = round_up(size, PAGE_SIZE);
> +
> +	if (!memblock_is_region_memory(start, size)) {
> +		pr_err("INITRD: 0x%08llx+0x%08lx is not a memory region",
> +		       (u64)start, size);
> +		goto disable;
> +	}
> +
> +	if (memblock_is_region_reserved(start, size)) {
> +		pr_err("INITRD: 0x%08llx+0x%08lx overlaps in-use memory region\n",
> +		       (u64)start, size);
> +		goto disable;
> +	}
> +
> +	memblock_reserve(start, size);
> +	/* Now convert initrd to virtual addresses */
> +	initrd_start = (unsigned long)__va(phys_initrd_start);
> +	initrd_end = initrd_start + phys_initrd_size;
> +	initrd_below_start_ok = 1;
> +
> +	return;
> +disable:
> +	pr_cont(" - disabling initrd\n");
> +	initrd_start = 0;
> +	initrd_end = 0;
> +}
> +
>  void __weak __init free_initrd_mem(unsigned long start, unsigned long end)
>  {
>  #ifdef CONFIG_ARCH_KEEP_MEMBLOCK

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