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Linux/ARM64: Make mremap() non-moving due to VA space woes.

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This reduces overall performance on ARM64, but we have no choice.
Linux kernel default userspace VA is 48 bit, but we'd need 47 bit.
mremap() ignores address hints due to a kernel API issue. The mapping
may move to an undesired address which will cause an assert or crash.

Reported by Raymond W. Ko.
This commit is contained in:
Mike Pall 2021-03-10 19:58:31 +01:00
parent ec6edc5c39
commit 67dbec82f4
1 changed files with 1 additions and 1 deletions
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2
src/lj_alloc.c
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@ -365,7 +365,7 @@ static void *CALL_MREMAP_(void *ptr, size_t osz, size_t nsz, int flags)
#define CALL_MREMAP(addr, osz, nsz, mv) CALL_MREMAP_((addr), (osz), (nsz), (mv))
#define CALL_MREMAP_NOMOVE 0
#define CALL_MREMAP_MAYMOVE 1
#if LJ_64 && !LJ_GC64
#if LJ_64 && (!LJ_GC64 || LJ_TARGET_ARM64)
#define CALL_MREMAP_MV CALL_MREMAP_NOMOVE
#else
#define CALL_MREMAP_MV CALL_MREMAP_MAYMOVE