diff options
| author | Ingo Molnar <mingo@elte.hu> | 2011-05-10 17:05:24 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2011-05-10 17:05:45 +0200 |
| commit | 932fed4e2e42c3d730c01bb63b1c4f812c533d5b (patch) | |
| tree | 11b1afac3a40d253cdb905c42901edfaae5e196e /lib/flex_array.c | |
| parent | 57d524154ffe99d27fb55e0e30ddbad9f4c35806 (diff) | |
| parent | 693d92a1bbc9e42681c42ed190bd42b636ca876f (diff) | |
Merge commit 'v2.6.39-rc7' into perf/core
Merge reason: pull in the latest fixes.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'lib/flex_array.c')
| -rw-r--r-- | lib/flex_array.c | 24 |
1 files changed, 18 insertions, 6 deletions
diff --git a/lib/flex_array.c b/lib/flex_array.c index c0ea40ba208..854b57bd7d9 100644 --- a/lib/flex_array.c +++ b/lib/flex_array.c @@ -232,10 +232,10 @@ EXPORT_SYMBOL(flex_array_clear); /** * flex_array_prealloc - guarantee that array space exists - * @fa: the flex array for which to preallocate parts - * @start: index of first array element for which space is allocated - * @end: index of last (inclusive) element for which space is allocated - * @flags: page allocation flags + * @fa: the flex array for which to preallocate parts + * @start: index of first array element for which space is allocated + * @nr_elements: number of elements for which space is allocated + * @flags: page allocation flags * * This will guarantee that no future calls to flex_array_put() * will allocate memory. It can be used if you are expecting to @@ -245,14 +245,24 @@ EXPORT_SYMBOL(flex_array_clear); * Locking must be provided by the caller. */ int flex_array_prealloc(struct flex_array *fa, unsigned int start, - unsigned int end, gfp_t flags) + unsigned int nr_elements, gfp_t flags) { int start_part; int end_part; int part_nr; + unsigned int end; struct flex_array_part *part; - if (start >= fa->total_nr_elements || end >= fa->total_nr_elements) + if (!start && !nr_elements) + return 0; + if (start >= fa->total_nr_elements) + return -ENOSPC; + if (!nr_elements) + return 0; + + end = start + nr_elements - 1; + + if (end >= fa->total_nr_elements) return -ENOSPC; if (elements_fit_in_base(fa)) return 0; @@ -343,6 +353,8 @@ int flex_array_shrink(struct flex_array *fa) int part_nr; int ret = 0; + if (!fa->total_nr_elements) + return 0; if (elements_fit_in_base(fa)) return ret; for (part_nr = 0; part_nr < FLEX_ARRAY_NR_BASE_PTRS; part_nr++) { |