Commit 7f22ced4 authored by Breno Leitao's avatar Breno Leitao Committed by Michael Ellerman

powerpc/kernel: Initialize load_tm on task creation

Currently tsk->thread.load_tm is not initialized in the task creation
and can contain garbage on a new task.

This is an undesired behaviour, since it affects the timing to enable
and disable the transactional memory laziness (disabling and enabling
the MSR TM bit, which affects TM reclaim and recheckpoint in the
scheduling process).

Fixes: 5d176f75 ("powerpc: tm: Enable transactional memory (TM) lazily for userspace")
Cc: stable@vger.kernel.org # v4.9+
Signed-off-by: default avatarBreno Leitao <leitao@debian.org>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent 1195892c
...@@ -1687,6 +1687,7 @@ void start_thread(struct pt_regs *regs, unsigned long start, unsigned long sp) ...@@ -1687,6 +1687,7 @@ void start_thread(struct pt_regs *regs, unsigned long start, unsigned long sp)
current->thread.tm_tfhar = 0; current->thread.tm_tfhar = 0;
current->thread.tm_texasr = 0; current->thread.tm_texasr = 0;
current->thread.tm_tfiar = 0; current->thread.tm_tfiar = 0;
current->thread.load_tm = 0;
#endif /* CONFIG_PPC_TRANSACTIONAL_MEM */ #endif /* CONFIG_PPC_TRANSACTIONAL_MEM */
} }
EXPORT_SYMBOL(start_thread); EXPORT_SYMBOL(start_thread);
......
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