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| author | David S. Miller <davem@sunset.davemloft.net> | 2007-05-26 10:14:43 +0200 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2007-05-29 11:49:49 +0200 |
| commit | 22adb358e816ce6aa0afb231ae9d826b0bddc8b0 (patch) | |
| tree | 6f9886bf5b4e5c916c72d8d5733211813873c5fc /include/asm-sparc64/thread_info.h | |
| parent | [SPARC64]: Use machine description and OBP properly for cpu probing. (diff) | |
| download | linux-22adb358e816ce6aa0afb231ae9d826b0bddc8b0.tar.xz linux-22adb358e816ce6aa0afb231ae9d826b0bddc8b0.zip | |
[SPARC64]: Eliminate NR_CPUS limitations.
Cheetah systems can have cpuids as large as 1023, although physical
systems don't have that many cpus.
Only three limitations existed in the kernel preventing arbitrary
NR_CPUS values:
1) dcache dirty cpu state stored in page->flags on
D-cache aliasing platforms. With some build time
calculations and some build-time BUG checks on
page->flags layout, this one was easily solved.
2) The cheetah XCALL delivery code could only handle
a cpumask with up to 32 cpus set. Some simple looping
logic clears that up too.
3) thread_info->cpu was a u8, easily changed to a u16.
There are a few spots in the kernel that still put NR_CPUS
sized arrays on the kernel stack, but that's not a sparc64
specific problem.
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/asm-sparc64/thread_info.h')
| -rw-r--r-- | include/asm-sparc64/thread_info.h | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/include/asm-sparc64/thread_info.h b/include/asm-sparc64/thread_info.h index 2ebf7f27bf91..98252cd44dd6 100644 --- a/include/asm-sparc64/thread_info.h +++ b/include/asm-sparc64/thread_info.h @@ -38,8 +38,8 @@ struct thread_info { /* D$ line 1 */ struct task_struct *task; unsigned long flags; - __u8 cpu; __u8 fpsaved[7]; + __u8 pad; unsigned long ksp; /* D$ line 2 */ @@ -49,7 +49,7 @@ struct thread_info { int preempt_count; /* 0 => preemptable, <0 => BUG */ __u8 new_child; __u8 syscall_noerror; - __u16 __pad; + __u16 cpu; unsigned long *utraps; @@ -83,8 +83,7 @@ struct thread_info { #define TI_CURRENT_DS (TI_FLAGS + TI_FLAG_BYTE_CURRENT_DS) #define TI_FPDEPTH (TI_FLAGS + TI_FLAG_BYTE_FPDEPTH) #define TI_WSAVED (TI_FLAGS + TI_FLAG_BYTE_WSAVED) -#define TI_CPU 0x00000010 -#define TI_FPSAVED 0x00000011 +#define TI_FPSAVED 0x00000010 #define TI_KSP 0x00000018 #define TI_FAULT_ADDR 0x00000020 #define TI_KREGS 0x00000028 @@ -92,6 +91,7 @@ struct thread_info { #define TI_PRE_COUNT 0x00000038 #define TI_NEW_CHILD 0x0000003c #define TI_SYS_NOERROR 0x0000003d +#define TI_CPU 0x0000003e #define TI_UTRAPS 0x00000040 #define TI_REG_WINDOW 0x00000048 #define TI_RWIN_SPTRS 0x000003c8 |