Commit 732c0c3c authored Jul 31, 2014 by Paul Burton Committed by Ralf Baechle Aug 02, 2014

MIPS: fix MSA context for tasks which don't use FP first



If a task does not execute scalar FP instructions prior to using MSA
then the flags indicating that the task has live MSA context were not
being set. The upper 64b of each vector register would then be lost
upon the tasks first context switch after using MSA.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/7500/


Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

parent c9017757

arch/mips/kernel/traps.c

+2 −0

Original line number	Original line	Diff line number	Diff line
	@@ -1097,6 +1097,8 @@ static int enable_restore_fp_context(int msa)
	if (msa && !err) {		if (msa && !err) {
	enable_msa();		enable_msa();
	_init_msa_upper();		_init_msa_upper();
			set_thread_flag(TIF_USEDMSA);
			set_thread_flag(TIF_MSA_CTX_LIVE);
	}		}
	if (!err)		if (!err)
	set_used_math();		set_used_math();