Messages in this thread Patch in this message | | | Subject | [PATCH 3/4] RT: remove finish_arch_switch | From | Frank Rowand <> | Date | Tue, 15 Jan 2008 14:20:46 -0800 |
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From: Frank Rowand <frank.rowand@am.sony.com>
This is probably just a temporary workaround for one procssor - the MIPS community will most likely want to architect a solution to this issue.
Make of preempt kernel barfs in kernel/sched.c ifdef finish_arch_switch. Remove the finish_arch_switch() for boards with TX49xx MIPS processor.
Signed-off-by: Frank Rowand <frank.rowand@am.sony.com> --- include/asm-mips/mach-tx49xx/cpu-feature-overrides.h | 7 7 + 0 - 0 ! include/asm-mips/system.h | 3 3 + 0 - 0 ! 2 files changed, 10 insertions(+)
Index: linux-2.6.24-rc7/include/asm-mips/mach-tx49xx/cpu-feature-overrides.h =================================================================== --- linux-2.6.24-rc7.orig/include/asm-mips/mach-tx49xx/cpu-feature-overrides.h +++ linux-2.6.24-rc7/include/asm-mips/mach-tx49xx/cpu-feature-overrides.h @@ -1,6 +1,13 @@ #ifndef __ASM_MACH_TX49XX_CPU_FEATURE_OVERRIDES_H #define __ASM_MACH_TX49XX_CPU_FEATURE_OVERRIDES_H +/* finish_arch_switch_empty is defined if we know finish_arch_switch() will + * be empty, based on the lack of features defined in this file. This is + * needed because config preempt will barf in kernel/sched.c ifdef + * finish_arch_switch + */ +#define finish_arch_switch_empty + #define cpu_has_llsc 1 #define cpu_has_64bits 1 #define cpu_has_inclusive_pcaches 0 Index: linux-2.6.24-rc7/include/asm-mips/system.h =================================================================== --- linux-2.6.24-rc7.orig/include/asm-mips/system.h +++ linux-2.6.24-rc7/include/asm-mips/system.h @@ -70,6 +70,8 @@ do { \ (last) = resume(prev, next, task_thread_info(next)); \ } while (0) +/* preempt kernel barfs in kernel/sched.c ifdef finish_arch_switch */ +#ifndef finish_arch_switch_empty #define finish_arch_switch(prev) \ do { \ if (cpu_has_dsp) \ @@ -77,6 +79,7 @@ do { \ if (cpu_has_userlocal) \ write_c0_userlocal(current_thread_info()->tp_value); \ } while (0) +#endif static inline unsigned long __xchg_u32(volatile int * m, unsigned int val) {
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