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Date: Wed, 28 Nov 2012 11:50:17 -0500
From: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To: Yinghai Lu <yinghai@...nel.org>
Cc: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
"H. Peter Anvin" <hpa@...or.com>, Jacob Shin <jacob.shin@....com>,
Andrew Morton <akpm@...ux-foundation.org>,
Stefano Stabellini <stefano.stabellini@...citrix.com>,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v8 04/46] x86, mm: Move init_memory_mapping calling out
of setup.c
On Fri, Nov 16, 2012 at 07:38:41PM -0800, Yinghai Lu wrote:
> Now init_memory_mapping is called two times, later will be called for every
> ram ranges.
What is 'later'? Can you say in which of the patches it will
be called for every RAM range?
>
> Could put all related init_mem calling together and out of setup.c.
That looks like a stray comment.
>
> Actually, it reverts commit 1bbbbe7
> x86: Exclude E820_RESERVED regions and memory holes above 4 GB from direct mapping.
> will address that later with complete solution include handling hole under 4g.
.. I presume that the later is one of the patches. Can you say:
'will address that in patch XYZ' ?
>
> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
> Reviewed-by: Pekka Enberg <penberg@...nel.org>
> ---
> arch/x86/include/asm/init.h | 1 -
> arch/x86/include/asm/pgtable.h | 2 +-
> arch/x86/kernel/setup.c | 27 +--------------------------
> arch/x86/mm/init.c | 19 ++++++++++++++++++-
> 4 files changed, 20 insertions(+), 29 deletions(-)
>
> diff --git a/arch/x86/include/asm/init.h b/arch/x86/include/asm/init.h
> index adcc0ae..4f13998 100644
> --- a/arch/x86/include/asm/init.h
> +++ b/arch/x86/include/asm/init.h
> @@ -12,7 +12,6 @@ kernel_physical_mapping_init(unsigned long start,
> unsigned long end,
> unsigned long page_size_mask);
>
> -
Stray whitespace.
> extern unsigned long __initdata pgt_buf_start;
> extern unsigned long __meminitdata pgt_buf_end;
> extern unsigned long __meminitdata pgt_buf_top;
> diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
> index 98ac76d..dd1a888 100644
> --- a/arch/x86/include/asm/pgtable.h
> +++ b/arch/x86/include/asm/pgtable.h
> @@ -602,7 +602,7 @@ static inline int pgd_none(pgd_t pgd)
> #ifndef __ASSEMBLY__
>
> extern int direct_gbpages;
> -void probe_page_size_mask(void);
> +void init_mem_mapping(void);
>
> /* local pte updates need not use xchg for locking */
> static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep)
> diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
> index 01fb5f9..23b079f 100644
> --- a/arch/x86/kernel/setup.c
> +++ b/arch/x86/kernel/setup.c
> @@ -913,34 +913,9 @@ void __init setup_arch(char **cmdline_p)
> setup_real_mode();
>
> init_gbpages();
> - probe_page_size_mask();
>
> - /* max_pfn_mapped is updated here */
> - max_low_pfn_mapped = init_memory_mapping(0, max_low_pfn<<PAGE_SHIFT);
> - max_pfn_mapped = max_low_pfn_mapped;
> + init_mem_mapping();
>
> -#ifdef CONFIG_X86_64
> - if (max_pfn > max_low_pfn) {
> - int i;
> - unsigned long start, end;
> - unsigned long start_pfn, end_pfn;
> -
> - for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn,
> - NULL) {
> -
> - end = PFN_PHYS(end_pfn);
> - if (end <= (1UL<<32))
> - continue;
> -
> - start = PFN_PHYS(start_pfn);
> - max_pfn_mapped = init_memory_mapping(
> - max((1UL<<32), start), end);
> - }
> -
> - /* can we preseve max_low_pfn ?*/
> - max_low_pfn = max_pfn;
> - }
> -#endif
> memblock.current_limit = get_max_mapped();
> dma_contiguous_reserve(0);
>
> diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
> index 701abbc..9e17f9e 100644
> --- a/arch/x86/mm/init.c
> +++ b/arch/x86/mm/init.c
> @@ -37,7 +37,7 @@ struct map_range {
>
> static int page_size_mask;
>
> -void probe_page_size_mask(void)
> +static void __init probe_page_size_mask(void)
> {
> #if !defined(CONFIG_DEBUG_PAGEALLOC) && !defined(CONFIG_KMEMCHECK)
> /*
> @@ -315,6 +315,23 @@ unsigned long __init_refok init_memory_mapping(unsigned long start,
> return ret >> PAGE_SHIFT;
> }
>
> +void __init init_mem_mapping(void)
> +{
> + probe_page_size_mask();
> +
> + /* max_pfn_mapped is updated here */
> + max_low_pfn_mapped = init_memory_mapping(0, max_low_pfn<<PAGE_SHIFT);
> + max_pfn_mapped = max_low_pfn_mapped;
> +
> +#ifdef CONFIG_X86_64
> + if (max_pfn > max_low_pfn) {
> + max_pfn_mapped = init_memory_mapping(1UL<<32,
> + max_pfn<<PAGE_SHIFT);
> + /* can we preseve max_low_pfn ?*/
> + max_low_pfn = max_pfn;
> + }
> +#endif
> +}
>
> /*
> * devmem_is_allowed() checks to see if /dev/mem access to a certain address
> --
> 1.7.7
--
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