[PATCH] ppc64: set SMT thread priority to medium for all exceptions

We need to set the thread priority to medium when entering all exceptions.
We may have been executing in low priority (eg the idle loop), but
definitely do not want to remain in that priority for the duration of the
exception (eg a device interrupt).

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/arch/ppc64/kernel/head.S b/arch/ppc64/kernel/head.S
index 3c2639b8c52019348588e4702bbc7425cfd36270..a5d67f59951dddae208c0c8fc491444b04aa84b8 100644 (file)
--- a/arch/ppc64/kernel/head.S
+++ b/arch/ppc64/kernel/head.S
@@ -303,12 +303,14 @@ exception_marker:
        . = n;                                          \
        .globl label##_Pseries;                         \
 label##_Pseries:                                       \
+       HMT_MEDIUM;                                     \
        mtspr   SPRG1,r13;              /* save r13 */  \
        EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label##_common)
 
 #define STD_EXCEPTION_ISERIES(n, label, area)          \
        .globl label##_Iseries;                         \
 label##_Iseries:                                       \
+       HMT_MEDIUM;                                     \
        mtspr   SPRG1,r13;              /* save r13 */  \
        EXCEPTION_PROLOG_ISERIES_1(area);               \
        EXCEPTION_PROLOG_ISERIES_2;                     \
@@ -317,6 +319,7 @@ label##_Iseries:                                    \
 #define MASKABLE_EXCEPTION_ISERIES(n, label)                           \
        .globl label##_Iseries;                                         \
 label##_Iseries:                                                       \
+       HMT_MEDIUM;                                                     \
        mtspr   SPRG1,r13;              /* save r13 */                  \
        EXCEPTION_PROLOG_ISERIES_1(PACA_EXGEN);                         \
        lbz     r10,PACAPROFENABLED(r13);                               \
@@ -410,12 +413,14 @@ __start_interrupts:
 
        . = 0x200
 _MachineCheckPseries:
+       HMT_MEDIUM
        mtspr   SPRG1,r13               /* save r13 */
        EXCEPTION_PROLOG_PSERIES(PACA_EXMC, MachineCheck_common)
 
        . = 0x300
        .globl DataAccess_Pseries
 DataAccess_Pseries:
+       HMT_MEDIUM
        mtspr   SPRG1,r13
 BEGIN_FTR_SECTION
        mtspr   SPRG2,r12
@@ -434,6 +439,7 @@ END_FTR_SECTION_IFCLR(CPU_FTR_SLB)
        . = 0x380
        .globl DataAccessSLB_Pseries
 DataAccessSLB_Pseries:
+       HMT_MEDIUM
        mtspr   SPRG1,r13
        mfspr   r13,SPRG3               /* get paca address into r13 */
        std     r9,PACA_EXSLB+EX_R9(r13)        /* save r9 - r12 */
@@ -461,6 +467,7 @@ DataAccessSLB_Pseries:
        . = 0x480
        .globl InstructionAccessSLB_Pseries
 InstructionAccessSLB_Pseries:
+       HMT_MEDIUM
        mtspr   SPRG1,r13
        mfspr   r13,SPRG3               /* get paca address into r13 */
        std     r9,PACA_EXSLB+EX_R9(r13)        /* save r9 - r12 */
@@ -494,6 +501,7 @@ InstructionAccessSLB_Pseries:
        . = 0xc00
        .globl  SystemCall_Pseries
 SystemCall_Pseries:
+       HMT_MEDIUM
        mr      r9,r13
        mfmsr   r10
        mfspr   r13,SPRG3
@@ -747,10 +755,12 @@ fwnmi_data_area:
        . = 0x8000
        .globl SystemReset_FWNMI
 SystemReset_FWNMI:
+       HMT_MEDIUM
        mtspr   SPRG1,r13               /* save r13 */
        EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, SystemReset_common)
        .globl MachineCheck_FWNMI
 MachineCheck_FWNMI:
+       HMT_MEDIUM
        mtspr   SPRG1,r13               /* save r13 */
        EXCEPTION_PROLOG_PSERIES(PACA_EXMC, MachineCheck_common)