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authorDavid S. Miller <davem@sunset.davemloft.net>2007-05-26 01:14:43 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2007-05-29 02:49:49 -0700
commit22adb358e816ce6aa0afb231ae9d826b0bddc8b0 (patch)
tree6f9886bf5b4e5c916c72d8d5733211813873c5fc /include
parent5cbc30737398b49f62ae8603129ce43ac7db1a41 (diff)
[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')
-rw-r--r--include/asm-sparc64/cpudata.h2
-rw-r--r--include/asm-sparc64/thread_info.h8
2 files changed, 5 insertions, 5 deletions
diff --git a/include/asm-sparc64/cpudata.h b/include/asm-sparc64/cpudata.h
index f321b1d2122..03c385de761 100644
--- a/include/asm-sparc64/cpudata.h
+++ b/include/asm-sparc64/cpudata.h
@@ -202,7 +202,7 @@ extern struct sun4v_2insn_patch_entry __sun4v_2insn_patch,
* the calculations done by the macro mid-stream.
*/
#define LOAD_PER_CPU_BASE(DEST, THR, REG1, REG2, REG3) \
- ldub [THR + TI_CPU], REG1; \
+ lduh [THR + TI_CPU], REG1; \
sethi %hi(__per_cpu_shift), REG3; \
sethi %hi(__per_cpu_base), REG2; \
ldx [REG3 + %lo(__per_cpu_shift)], REG3; \
diff --git a/include/asm-sparc64/thread_info.h b/include/asm-sparc64/thread_info.h
index 2ebf7f27bf9..98252cd44dd 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