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| author | Huacai Chen <chenhc@lemote.com> | 2020-09-21 11:12:26 +0200 |
|---|---|---|
| committer | Thomas Bogendoerfer <tsbogend@alpha.franken.de> | 2020-09-21 22:14:47 +0200 |
| commit | 4e43e5df5850ca8300180f422727e42a5065aaaa (patch) | |
| tree | bfede98a2cccf4cfb275519cbb321b946005f668 /arch/mips/include | |
| parent | MIPS: kernel: include probes-common.h header in branch.c (diff) | |
| download | linux-4e43e5df5850ca8300180f422727e42a5065aaaa.tar.xz linux-4e43e5df5850ca8300180f422727e42a5065aaaa.zip | |
MIPS: context switch: Use save/restore instead of set/clear for Status.CU2
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>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Diffstat (limited to 'arch/mips/include')
| -rw-r--r-- | arch/mips/include/asm/switch_to.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/mips/include/asm/switch_to.h b/arch/mips/include/asm/switch_to.h index 0b0a93bf83cd..a4374b4cb88f 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(); \ |