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32 lines
1.2 KiB
32 lines
1.2 KiB
9 months ago
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commit f144981490bd2ab13189d85902ca74beecb307e4
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Author: DJ Delorie <dj@redhat.com>
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Date: Wed Oct 30 18:03:14 2019 -0400
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Base max_fast on alignment, not width, of bins (Bug 24903)
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set_max_fast sets the "impossibly small" value based on,
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eventually, MALLOC_ALIGNMENT. The comparisons for the smallest
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chunk used is, eventually, MIN_CHUNK_SIZE. Note that i386
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is the only platform where these are the same, so a smallest
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chunk *would* be put in a no-fastbins fastbin.
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This change calculates the "impossibly small" value
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based on MIN_CHUNK_SIZE instead, so that we can know it will
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always be impossibly small.
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(cherry picked from commit ff12e0fb91b9072800f031cb21fb2651ee7b6251)
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diff --git a/malloc/malloc.c b/malloc/malloc.c
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index 9756ed0a0d28c5f6..90825b2aaed53761 100644
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--- a/malloc/malloc.c
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+++ b/malloc/malloc.c
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@@ -1635,7 +1635,7 @@ static INTERNAL_SIZE_T global_max_fast;
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#define set_max_fast(s) \
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global_max_fast = (((s) == 0) \
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- ? SMALLBIN_WIDTH : ((s + SIZE_SZ) & ~MALLOC_ALIGN_MASK))
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+ ? MIN_CHUNK_SIZE / 2 : ((s + SIZE_SZ) & ~MALLOC_ALIGN_MASK))
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static inline INTERNAL_SIZE_T
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get_max_fast (void)
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