d7bbdc9bf4
[ Upstream commit c73801ae4f22b390228ebf471d55668e824198b6 ]
On no-MMU, all futexes are treated as private because there is no need
to map a virtual address to physical to match the futex across
processes. This doesn't quite work though, because private futexes
include the current process's mm_struct as part of their key. This makes
it impossible for one process to wake up a shared futex being waited on
in another process.
Fix this bug by excluding the mm_struct from the key. With
a single address space, the futex address is already a unique key.
Fixes:
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|---|---|---|
| .. | ||
| Makefile | ||
| core.c | ||
| futex.h | ||
| pi.c | ||
| requeue.c | ||
| syscalls.c | ||
| waitwake.c | ||