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authorPaul Burton <paul.burton@imgtec.com>2014-07-31 15:53:16 +0200
committerRalf Baechle <ralf@linux-mips.org>2014-08-02 00:06:44 +0200
commit732c0c3c70869af53654db2b56dffdd8d4df5211 (patch)
treee27283e34e5a2fb6d7e3ab88412eb8573b7c0c43
parentMIPS: init upper 64b of vector registers when MSA is first used (diff)
downloadlinux-732c0c3c70869af53654db2b56dffdd8d4df5211.tar.xz
linux-732c0c3c70869af53654db2b56dffdd8d4df5211.zip
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>
-rw-r--r--arch/mips/kernel/traps.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index 1ed84577d3e3..4716b89543a9 100644
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -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();