AcoSail/kernel_optimize_test
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x86: use __page_aligned_data/bss

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Update arch/x86's use of page-aligned variables.  The change to
arch/x86/xen/mmu.c fixes an actual bug, but the rest are cleanups
and to set a precedent.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: Stephen Tweedie <sct@redhat.com>
Cc: Eduardo Habkost <ehabkost@redhat.com>
Cc: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Jeremy Fitzhardinge 2008-07-08 15:06:27 -07:00 committed by Ingo Molnar
parent 87b935a0ef
commit cbcd79c2e5
3 changed files with 10 additions and 16 deletions
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4
arch/x86/kernel/cpu/common_64.c
View File

@ -16,6 +16,7 @@
#include <asm/i387.h>
#include <asm/msr.h>
#include <asm/io.h>
#include <asm/linkage.h>
#include <asm/mmu_context.h>
#include <asm/mtrr.h>
#include <asm/mce.h>
@ -517,8 +518,7 @@ void pda_init(int cpu)
}
char boot_exception_stacks[(N_EXCEPTION_STACKS - 1) * EXCEPTION_STKSZ +
DEBUG_STKSZ]
__attribute__((section(".bss.page_aligned")));
DEBUG_STKSZ] __page_aligned_bss;
extern asmlinkage void ignore_sysret(void);

7
arch/x86/kernel/irq_32.c
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@ -83,11 +83,8 @@ union irq_ctx {
static union irq_ctx *hardirq_ctx[NR_CPUS] __read_mostly;
static union irq_ctx *softirq_ctx[NR_CPUS] __read_mostly;
static char softirq_stack[NR_CPUS * THREAD_SIZE]
__attribute__((__section__(".bss.page_aligned")));
static char hardirq_stack[NR_CPUS * THREAD_SIZE]
__attribute__((__section__(".bss.page_aligned")));
static char softirq_stack[NR_CPUS * THREAD_SIZE] __page_aligned_bss;
static char hardirq_stack[NR_CPUS * THREAD_SIZE] __page_aligned_bss;
static void call_on_stack(void *func, void *stack)
{

15
arch/x86/xen/mmu.c
View File

@ -46,6 +46,7 @@
#include <asm/tlbflush.h>
#include <asm/mmu_context.h>
#include <asm/paravirt.h>
#include <asm/linkage.h>
#include <asm/xen/hypercall.h>
#include <asm/xen/hypervisor.h>
@ -60,22 +61,18 @@
#define TOP_ENTRIES (MAX_DOMAIN_PAGES / P2M_ENTRIES_PER_PAGE)
/* Placeholder for holes in the address space */
static unsigned long p2m_missing[P2M_ENTRIES_PER_PAGE]
__attribute__((section(".data.page_aligned"))) =
static unsigned long p2m_missing[P2M_ENTRIES_PER_PAGE] __page_aligned_data =
{ [ 0 ... P2M_ENTRIES_PER_PAGE-1 ] = ~0UL };
/* Array of pointers to pages containing p2m entries */
static unsigned long *p2m_top[TOP_ENTRIES]
__attribute__((section(".data.page_aligned"))) =
static unsigned long *p2m_top[TOP_ENTRIES] __page_aligned_data =
{ [ 0 ... TOP_ENTRIES - 1] = &p2m_missing[0] };
/* Arrays of p2m arrays expressed in mfns used for save/restore */
static unsigned long p2m_top_mfn[TOP_ENTRIES]
__attribute__((section(".bss.page_aligned")));
static unsigned long p2m_top_mfn[TOP_ENTRIES] __page_aligned_bss;
static unsigned long p2m_top_mfn_list[
PAGE_ALIGN(TOP_ENTRIES / P2M_ENTRIES_PER_PAGE)]
__attribute__((section(".bss.page_aligned")));
static unsigned long p2m_top_mfn_list[TOP_ENTRIES / P2M_ENTRIES_PER_PAGE]
__page_aligned_bss;
static inline unsigned p2m_top_index(unsigned long pfn)
{