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From: Breno Leitao <leitao@debian.org>
To: linuxppc-dev@lists.ozlabs.org
Cc: Anton Blanchard <anton@samba.org>
Subject: [PATCH] powerpc/kernel: Initialize load_tm on task creation
Date: Mon,  5 Jun 2017 11:40:59 -0300	[thread overview]
Message-ID: <1496673659-18499-1-git-send-email-leitao@debian.org> (raw)

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).

CC: Anton Blanchard <anton@samba.org>
Fixes: 5d176f751ee3c6eededd984ad409bff201f436a7
Signed-off-by: Breno Leitao <leitao@debian.org>
---
 arch/powerpc/kernel/process.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index a9435397eab8..2ad725ef4368 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -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_texasr = 0;
 	current->thread.tm_tfiar = 0;
+	current->thread.load_tm = 0;
 #endif /* CONFIG_PPC_TRANSACTIONAL_MEM */
 }
 EXPORT_SYMBOL(start_thread);
-- 
2.11.0

             reply	other threads:[~2017-06-05 14:42 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-06-05 14:40 Breno Leitao [this message]
2017-06-05 22:52 ` [PATCH] powerpc/kernel: Initialize load_tm on task creation Daniel Axtens
2017-06-06  4:47   ` Michael Ellerman
2017-06-08  4:05 ` Michael Ellerman

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