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SubjectRe: [PATCH 07/39] lmb: Add lmb_find_area()
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On Thu, 2010-04-08 at 23:03 -0700, Yinghai Lu wrote:
> It will try find area according with size/align in specified range (start, end).
>
> lmb_find_area() will honor goal/limit.
>
> also make it more easy for x86 to use lmb.
> x86 early_res is using find/reserve pattern instead of alloc.
>
> When we need temporaray buff for range array etc for range work, if We are using
> lmb_alloc(), We will need to add some post fix code for buffer that is used
> by range array, because it is in the lmb.reserved already. and have to call
> extra lmb_free().
>
> -v2: Change name to lmb_find_area() according to Michael Ellerman
> -v3: Add generic weak version __lmb_find_area()

Haven't you noticed there's already way too many functions walking the
LMBs ? :-)

I think the ones doing nid alloc could/should be also rewritten to use
one single low level __lmb_find_* no ?

Cheers,
Ben.

> Signed-off-by: Yinghai Lu <yinghai@kernel.org>
> ---
> include/linux/lmb.h | 4 ++++
> mm/lmb.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++
> 2 files changed, 53 insertions(+), 0 deletions(-)
>
> diff --git a/include/linux/lmb.h b/include/linux/lmb.h
> index e14ea8d..4cf2f3b 100644
> --- a/include/linux/lmb.h
> +++ b/include/linux/lmb.h
> @@ -83,6 +83,10 @@ lmb_end_pfn(struct lmb_region *type, unsigned long region_nr)
> lmb_size_pages(type, region_nr);
> }
>
> +u64 __lmb_find_area(u64 ei_start, u64 ei_last, u64 start, u64 end,
> + u64 size, u64 align);
> +u64 lmb_find_area(u64 start, u64 end, u64 size, u64 align);
> +
> #include <asm/lmb.h>
>
> #endif /* __KERNEL__ */
> diff --git a/mm/lmb.c b/mm/lmb.c
> index 392d805..7010212 100644
> --- a/mm/lmb.c
> +++ b/mm/lmb.c
> @@ -11,9 +11,13 @@
> */
>
> #include <linux/kernel.h>
> +#include <linux/types.h>
> #include <linux/init.h>
> #include <linux/bitops.h>
> #include <linux/lmb.h>
> +#include <linux/bootmem.h>
> +#include <linux/mm.h>
> +#include <linux/range.h>
>
> #define LMB_ALLOC_ANYWHERE 0
>
> @@ -559,3 +563,48 @@ int lmb_find(struct lmb_property *res)
> }
> return -1;
> }
> +
> +u64 __init __weak __lmb_find_area(u64 ei_start, u64 ei_last, u64 start, u64 end,
> + u64 size, u64 align)
> +{
> + u64 final_start, final_end;
> + u64 mem;
> +
> + final_start = max(ei_start, start);
> + final_end = min(ei_last, end);
> +
> + if (final_start >= final_end)
> + return -1ULL;
> +
> + mem = __lmb_find_base(size, align, final_end);
> +
> + if (mem == -1ULL)
> + return -1ULL;
> +
> + lmb_free(mem, size);
> + if (mem >= final_start)
> + return mem;
> +
> + return -1ULL;
> +}
> +
> +/*
> + * Find a free area with specified alignment in a specific range.
> + */
> +u64 __init __weak lmb_find_area(u64 start, u64 end, u64 size, u64 align)
> +{
> + int i;
> +
> + for (i = lmb.memory.cnt - 1; i >= 0; i--) {
> + u64 ei_start = lmb.memory.region[i].base;
> + u64 ei_last = ei_start + lmb.memory.region[i].size;
> + u64 addr;
> +
> + addr = __lmb_find_area(ei_start, ei_last, start, end,
> + size, align);
> +
> + if (addr != -1ULL)
> + return addr;
> + }
> + return -1ULL;
> +}




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