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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>
hifive-unleashed-5.1
Paul Burton 2014-07-31 14:53:16 +01:00 committed by Ralf Baechle
parent c9017757c5
commit 732c0c3c70
1 changed files with 2 additions and 0 deletions
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2
arch/mips/kernel/traps.c
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@ -1097,6 +1097,8 @@ static int enable_restore_fp_context(int msa)
if (msa && !err) {
enable_msa();
_init_msa_upper();
set_thread_flag(TIF_USEDMSA);
set_thread_flag(TIF_MSA_CTX_LIVE);
}
if (!err)
set_used_math();