From: Anshuman Khandual <anshuman.khandual@arm.com>
To: Mike Rapoport <rppt@kernel.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>,
Mark Rutland <mark.rutland@arm.com>
Cc: Laura Abbott <labbott@redhat.com>,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, Mike Rapoport <rppt@linux.ibm.com>
Subject: Re: [PATCH v4] arm64: use generic free_initrd_mem()
Date: Mon, 30 Sep 2019 10:54:45 +0530 [thread overview]
Message-ID: <4267bfb4-db55-49a5-634f-7d1b1fce650e@arm.com> (raw)
In-Reply-To: <1569657746-31672-1-git-send-email-rppt@kernel.org>
On 09/28/2019 01:32 PM, Mike Rapoport wrote:
> From: Mike Rapoport <rppt@linux.ibm.com>
>
> arm64 calls memblock_free() for the initrd area in its implementation of
> free_initrd_mem(), but this call has no actual effect that late in the boot
> process. By the time initrd is freed, all the reserved memory is managed by
> the page allocator and the memblock.reserved is unused, so the only purpose
> of the memblock_free() call is to keep track of initrd memory for debugging
> and accounting.
Thats correct. memblock_free_all() gets called before free_initrd_mem().
>
> Without the memblock_free() call the only difference between arm64 and the
> generic versions of free_initrd_mem() is the memory poisoning.
>
> Move memblock_free() call to the generic code, enable it there
> for the architectures that define ARCH_KEEP_MEMBLOCK and use the generic
> implementation of free_initrd_mem() on arm64.
This improves free_initrd_mem() generic implementation for others to use.
>
> Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Tested-by: Anshuman Khandual <anshuman.khandual@arm.com> #arm64
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
> ---
>
> v4:
> * memblock_free() aligned area around the initrd
>
> v3:
> * fix powerpc build
>
> v2:
> * add memblock_free() to the generic free_initrd_mem()
> * rebase on the current upstream
>
>
> arch/arm64/mm/init.c | 12 ------------
> init/initramfs.c | 8 ++++++++
> 2 files changed, 8 insertions(+), 12 deletions(-)
>
> diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
> index 45c00a5..87a0e3b 100644
> --- a/arch/arm64/mm/init.c
> +++ b/arch/arm64/mm/init.c
> @@ -580,18 +580,6 @@ void free_initmem(void)
> unmap_kernel_range((u64)__init_begin, (u64)(__init_end - __init_begin));
> }
>
> -#ifdef CONFIG_BLK_DEV_INITRD
> -void __init free_initrd_mem(unsigned long start, unsigned long end)
> -{
> - unsigned long aligned_start, aligned_end;
> -
> - aligned_start = __virt_to_phys(start) & PAGE_MASK;
> - aligned_end = PAGE_ALIGN(__virt_to_phys(end));
> - memblock_free(aligned_start, aligned_end - aligned_start);
> - free_reserved_area((void *)start, (void *)end, 0, "initrd");
> -}
> -#endif
> -
> /*
> * Dump out memory limit information on panic.
> */
> diff --git a/init/initramfs.c b/init/initramfs.c
> index c47dad0..8ec1be4 100644
> --- a/init/initramfs.c
> +++ b/init/initramfs.c
> @@ -10,6 +10,7 @@
> #include <linux/syscalls.h>
> #include <linux/utime.h>
> #include <linux/file.h>
> +#include <linux/memblock.h>
>
> static ssize_t __init xwrite(int fd, const char *p, size_t count)
> {
> @@ -529,6 +530,13 @@ extern unsigned long __initramfs_size;
>
> void __weak free_initrd_mem(unsigned long start, unsigned long end)
> {
> +#ifdef CONFIG_ARCH_KEEP_MEMBLOCK
> + unsigned long aligned_start = ALIGN_DOWN(start, PAGE_SIZE);
> + unsigned long aligned_end = ALIGN(end, PAGE_SIZE);
> +
> + memblock_free(__pa(aligned_start), aligned_end - aligned_start);
> +#endif
> +
> free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM,
> "initrd");
> }
>
next prev parent reply other threads:[~2019-09-30 5:25 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-28 8:02 [PATCH v4] arm64: use generic free_initrd_mem() Mike Rapoport
2019-09-30 5:24 ` Anshuman Khandual [this message]
2019-10-15 0:46 ` Will Deacon
2019-10-15 7:39 ` Mike Rapoport
2019-10-15 16:19 ` Will Deacon
2019-10-16 12:55 ` Catalin Marinas
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