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[IA64] Put the space for cpu0 per-cpu area into .data section

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Initial fix for making sure that we can access percpu variables
in all C code (commit: 10617bbe84)
inadvertantly allocated the memory in the "percpu" section of
the vmlinux ELF executable.  This confused kexec/dump.

Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
Tony Luck 2008-09-29 16:39:19 -07:00
parent 94aca1dac6
commit c459ce8b5a
5 changed files with 15 additions and 9 deletions
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3
arch/ia64/include/asm/sections.h
View file

@ -11,6 +11,9 @@
#include <asm-generic/sections.h>
extern char __per_cpu_start[], __per_cpu_end[], __phys_per_cpu_start[];
#ifdef CONFIG_SMP
extern char __cpu0_per_cpu[];
#endif
extern char __start___vtop_patchlist[], __end___vtop_patchlist[];
extern char __start___rse_patchlist[], __end___rse_patchlist[];
extern char __start___mckinley_e9_bundles[], __end___mckinley_e9_bundles[];

9
arch/ia64/kernel/head.S
View file

@ -367,16 +367,17 @@ start_ap:
;;
#else
(isAP) br.few 2f
mov r20=r19
sub r19=r19,r18
movl r20=__cpu0_per_cpu
;;
shr.u r18=r18,3
1:
ld8 r21=[r20],8;;
st8[r19]=r21,8
ld8 r21=[r19],8;;
st8[r20]=r21,8
adds r18=-1,r18;;
cmp4.lt p7,p6=0,r18
(p7) br.cond.dptk.few 1b
mov r19=r20
;;
2:
#endif
tpa r19=r19

8
arch/ia64/kernel/vmlinux.lds.S
View file

@ -215,9 +215,6 @@ SECTIONS
/* Per-cpu data: */
percpu : { } :percpu
. = ALIGN(PERCPU_PAGE_SIZE);
#ifdef CONFIG_SMP
. = . + PERCPU_PAGE_SIZE; /* cpu0 per-cpu space */
#endif
__phys_per_cpu_start = .;
.data.percpu PERCPU_ADDR : AT(__phys_per_cpu_start - LOAD_OFFSET)
{
@ -233,6 +230,11 @@ SECTIONS
data : { } :data
.data : AT(ADDR(.data) - LOAD_OFFSET)
{
#ifdef CONFIG_SMP
. = ALIGN(PERCPU_PAGE_SIZE);
__cpu0_per_cpu = .;
. = . + PERCPU_PAGE_SIZE; /* cpu0 per-cpu space */
#endif
DATA_DATA
*(.data1)
*(.gnu.linkonce.d*)

2
arch/ia64/mm/contig.c
View file

@ -163,7 +163,7 @@ per_cpu_init (void)
* get_zeroed_page().
*/
if (first_time) {
void *cpu0_data = __phys_per_cpu_start - PERCPU_PAGE_SIZE;
void *cpu0_data = __cpu0_per_cpu;
first_time=0;

2
arch/ia64/mm/discontig.c
View file

@ -144,7 +144,7 @@ static void *per_cpu_node_setup(void *cpu_data, int node)
for_each_possible_early_cpu(cpu) {
if (cpu == 0) {
void *cpu0_data = __phys_per_cpu_start - PERCPU_PAGE_SIZE;
void *cpu0_data = __cpu0_per_cpu;
__per_cpu_offset[cpu] = (char*)cpu0_data -
__per_cpu_start;
} else if (node == node_cpuid[cpu].nid) {