The patch titled
flex_array: add flex_array_clear function
has been added to the -mm tree. Its filename is
flex_array-add-flex_array_clear-function.patch
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------------------------------------------------------
Subject: flex_array: add flex_array_clear function
From: David Rientjes <rientjes@xxxxxxxxxx>
Add a new function to the flex_array API:
int flex_array_clear(struct flex_array *fa,
unsigned int element_nr)
This function will zero the element at element_nr in the flex_array.
Although this is equivalent to using flex_array_put() and passing a
pointer to zero'd memory, flex_array_clear() does not require such a
pointer to memory that would most likely need to be allocated on the
caller's stack which could be significantly large depending on
element_size.
Signed-off-by: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Dave Hansen <dave@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/flex_array.h | 1 +
lib/flex_array.c | 26 ++++++++++++++++++++++++++
2 files changed, 27 insertions(+)
diff -puN include/linux/flex_array.h~flex_array-add-flex_array_clear-function include/linux/flex_array.h
--- a/include/linux/flex_array.h~flex_array-add-flex_array_clear-function
+++ a/include/linux/flex_array.h
@@ -44,6 +44,7 @@ void flex_array_free(struct flex_array *
void flex_array_free_parts(struct flex_array *fa);
int flex_array_put(struct flex_array *fa, unsigned int element_nr, void *src,
gfp_t flags);
+int flex_array_clear(struct flex_array *fa, unsigned int element_nr);
void *flex_array_get(struct flex_array *fa, unsigned int element_nr);
#endif /* _FLEX_ARRAY_H */
diff -puN lib/flex_array.c~flex_array-add-flex_array_clear-function lib/flex_array.c
--- a/lib/flex_array.c~flex_array-add-flex_array_clear-function
+++ a/lib/flex_array.c
@@ -207,6 +207,32 @@ int flex_array_put(struct flex_array *fa
}
/**
+ * flex_array_clear - clear element in array at @element_nr
+ * @element_nr: index of the position to clear.
+ *
+ * Locking must be provided by the caller.
+ */
+int flex_array_clear(struct flex_array *fa, unsigned int element_nr)
+{
+ int part_nr = fa_element_to_part_nr(fa, element_nr);
+ struct flex_array_part *part;
+ void *dst;
+
+ if (element_nr >= fa->total_nr_elements)
+ return -ENOSPC;
+ if (elements_fit_in_base(fa))
+ part = (struct flex_array_part *)&fa->parts[0];
+ else {
+ part = fa->parts[part_nr];
+ if (!part)
+ return -EINVAL;
+ }
+ dst = &part->elements[index_inside_part(fa, element_nr)];
+ memset(dst, 0, fa->element_size);
+ return 0;
+}
+
+/**
* flex_array_prealloc - guarantee that array space exists
* @start: index of first array element for which space is allocated
* @end: index of last (inclusive) element for which space is allocated
_
Patches currently in -mm which might be from rientjes@xxxxxxxxxx are
origin.patch
linux-next.patch
flex_array-fix-get-function-for-elements-in-base-starting-at-non-zero.patch
flex_array-fix-flex_array_free_parts-comment.patch
flex_array-declare-parts-member-to-have-incomplete-type.patch
flex_array-convert-element_nr-formals-to-unsigned.patch
flex_array-add-flex_array_clear-function.patch
flex_array-poison-free-elements.patch
flex_array-add-flex_array_shrink-function.patch
mm-remove-obsoleted-alloc_pages-cpuset-comment.patch
hugetlb-balance-freeing-of-huge-pages-across-nodes.patch
hugetlb-use-free_pool_huge_page-to-return-unused-surplus-pages.patch
hugetlb-use-free_pool_huge_page-to-return-unused-surplus-pages-fix.patch
hugetlb-clean-up-and-update-huge-pages-documentation.patch
mm-oom-analysis-add-per-zone-statistics-to-show_free_areas.patch
mm-oom-analysis-add-buffer-cache-information-to-show_free_areas.patch
mm-oom-analysis-show-kernel-stack-usage-in-proc-meminfo-and-oom-log-output.patch
mm-oom-analysis-add-shmem-vmstat.patch
mm-update-alloc_flags-after-oom-killer-has-been-called.patch
pagemap-clear_refs-modify-to-specify-anon-or-mapped-vma-clearing.patch
oom-move-oom_killer_enable-oom_killer_disable-to-where-they-belong.patch
fs-proc-task_mmuc-v1-fix-clear_refs_write-input-sanity-check.patch
do_wait-optimization-do-not-place-sub-threads-on-task_struct-children-list.patch
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