diff options
| author | Markos Chandras <markos.chandras@imgtec.com> | 2015-01-26 09:40:34 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-03-06 14:52:54 -0800 |
| commit | 6ce23db8e9e0677fe8f5312a3a1da66f4c840014 (patch) | |
| tree | 1d7dce0e7a8206fe954b335d8c48b0c383f4b178 /arch | |
| parent | ef20dc5df0666d81baefab44e84ebd893d52e3a4 (diff) | |
MIPS: asm: pgtable: Add c0 hazards on HTW start/stop sequences
commit 461d1597ffad7a826f8aaa63ab0727c37b632e34 upstream.
When we use htw_{start,stop}() outside of htw_reset(), we need
to ensure that c0 changes have been propagated properly before
we attempt to continue with subsequence memory operations.
Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9114/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/mips/include/asm/pgtable.h | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/arch/mips/include/asm/pgtable.h b/arch/mips/include/asm/pgtable.h index d6d1928539b1..7f7c558de9fc 100644 --- a/arch/mips/include/asm/pgtable.h +++ b/arch/mips/include/asm/pgtable.h @@ -99,16 +99,20 @@ extern void paging_init(void); #define htw_stop() \ do { \ - if (cpu_has_htw) \ + if (cpu_has_htw) { \ write_c0_pwctl(read_c0_pwctl() & \ ~(1 << MIPS_PWCTL_PWEN_SHIFT)); \ + back_to_back_c0_hazard(); \ + } \ } while(0) #define htw_start() \ do { \ - if (cpu_has_htw) \ + if (cpu_has_htw) { \ write_c0_pwctl(read_c0_pwctl() | \ (1 << MIPS_PWCTL_PWEN_SHIFT)); \ + back_to_back_c0_hazard(); \ + } \ } while(0) @@ -116,9 +120,7 @@ do { \ do { \ if (cpu_has_htw) { \ htw_stop(); \ - back_to_back_c0_hazard(); \ htw_start(); \ - back_to_back_c0_hazard(); \ } \ } while(0) |