| Message ID | 1599473169-6599-1-git-send-email-chenhc@lemote.com (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | [V6,1/3] MIPS: context switch: Use save/restore instead of set/clear for Status.CU2 | expand |
diff --git a/arch/mips/include/asm/switch_to.h b/arch/mips/include/asm/switch_to.h index 0b0a93b..a4374b4 100644 --- a/arch/mips/include/asm/switch_to.h +++ b/arch/mips/include/asm/switch_to.h @@ -117,6 +117,8 @@ do { \ __restore_dsp(next); \ } \ if (cop2_present) { \ + u32 status = read_c0_status(); \ + \ set_c0_status(ST0_CU2); \ if ((KSTK_STATUS(prev) & ST0_CU2)) { \ if (cop2_lazy_restore) \ @@ -127,7 +129,7 @@ do { \ !cop2_lazy_restore) { \ cop2_restore(next); \ } \ - clear_c0_status(ST0_CU2); \ + write_c0_status(status); \ } \ __clear_r5_hw_ll_bit(); \ __clear_software_ll_bit(); \
Some processors (such as Loongson-3) need to enable CU2 in kernel mode, current set/clear method will lose Status.CU2 during context switching, so use save/restore method instead. Signed-off-by: Huacai Chen <chenhc@lemote.com> --- arch/mips/include/asm/switch_to.h | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)