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Changed required alignment of lookahead_size to 64 bits

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This is to prepare for future compatibility with other implementations
of the allocator's lookahead that are under consideration. The most
promising design so far is a sort of segments-list data structure that
stores pointer+size pairs, requiring 64-bits of alignment.

Changing this now takes advantage of the major version to avoid a
compatibility break in the future. If we end up not changing the
allocator or don't need 64-bit alignment we can easily drop this
requirement without breaking anyone's code.
This commit is contained in:
Christopher Haster
2018-10-22 17:58:47 -05:00
parent 5b26c68ae2
commit dc507a7b5f
1 changed files with 2 additions and 2 deletions
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4
lfs.c
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@@ -3095,8 +3095,8 @@ static int lfs_init(lfs_t *lfs, const struct lfs_config *cfg) {
lfs_cache_zero(lfs, &lfs->rcache); lfs_cache_zero(lfs, &lfs->rcache);
lfs_cache_zero(lfs, &lfs->pcache); lfs_cache_zero(lfs, &lfs->pcache);
// setup lookahead, must be multiple of 32-bits // setup lookahead, must be multiple of 64-bits
LFS_ASSERT(lfs->cfg->lookahead_size % 4 == 0); LFS_ASSERT(lfs->cfg->lookahead_size % 8 == 0);
LFS_ASSERT(lfs->cfg->lookahead_size > 0); LFS_ASSERT(lfs->cfg->lookahead_size > 0);
if (lfs->cfg->lookahead_buffer) { if (lfs->cfg->lookahead_buffer) {
lfs->free.buffer = lfs->cfg->lookahead_buffer; lfs->free.buffer = lfs->cfg->lookahead_buffer;