[PATCH v3 6/8] x86/xen: Use __pa_symbol instead of __pa on C visible symbols

Alexander Duyck
2012-11-05T19:05:45Z

This change updates a few of the functions to use __pa_symbol when
translating C visible symbols instead of __pa. By using __pa_symbol we are
able to drop a few extra lines of code as don't have to test to see if the
virtual pointer is a part of the kernel text or just standard virtual memory.

Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
---

arch/x86/xen/mmu.c | 21 +++++++++++----------
1 files changed, 11 insertions(+), 10 deletions(-)

diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
index 4a05b39..a63e5f9 100644
--- a/arch/x86/xen/mmu.c
+++ b/arch/x86/xen/mmu.c
@@ -1486,7 +1486,8 @@ static int xen_pgd_alloc(struct mm_struct *mm)

if (user_pgd != NULL) {
user_pgd[pgd_index(VSYSCALL_START)] =
- __pgd(__pa(level3_user_vsyscall) | _PAGE_TABLE);
+ __pgd(__pa_symbol(level3_user_vsyscall) |
+ _PAGE_TABLE);
ret = 0;
}

@@ -1958,10 +1959,10 @@ void __init xen_setup_kernel_pagetable(pgd_t *pgd, unsigned long max_pfn)
* pgd.
*/
if (xen_feature(XENFEAT_writable_page_tables)) {
- native_write_cr3(__pa(init_level4_pgt));
+ native_write_cr3(__pa_symbol(init_level4_pgt));
} else {
xen_mc_batch();
- __xen_write_cr3(true, __pa(init_level4_pgt));
+ __xen_write_cr3(true, __pa_symbol(init_level4_pgt));
xen_mc_issue(PARAVIRT_LAZY_CPU);
}
/* We can't that easily rip out L3 and L2, as the Xen pagetables are
@@ -1984,10 +1985,10 @@ static RESERVE_BRK_ARRAY(pmd_t, swapper_kernel_pmd, PTRS_PER_PMD);

static void __init xen_write_cr3_init(unsigned long cr3)
{
- unsigned long pfn = PFN_DOWN(__pa(swapper_pg_dir));
+ unsigned long pfn = PFN_DOWN(__pa_symbol(swapper_pg_dir));

- BUG_ON(read_cr3() != __pa(initial_page_table));
- BUG_ON(cr3 != __pa(swapper_pg_dir));
+ BUG_ON(read_cr3() != __pa_symbol(initial_page_table));
+ BUG_ON(cr3 != __pa_symbol(swapper_pg_dir));

/*
* We are switching to swapper_pg_dir for the first time (from
@@ -2011,7 +2012,7 @@ static void __init xen_write_cr3_init(unsigned long cr3)
pin_pagetable_pfn(MMUEXT_PIN_L3_TABLE, pfn);

pin_pagetable_pfn(MMUEXT_UNPIN_TABLE,
- PFN_DOWN(__pa(initial_page_table)));
+ PFN_DOWN(__pa_symbol(initial_page_table)));
set_page_prot(initial_page_table, PAGE_KERNEL);
set_page_prot(initial_kernel_pmd, PAGE_KERNEL);

@@ -2036,7 +2037,7 @@ void __init xen_setup_kernel_pagetable(pgd_t *pgd, unsigned long max_pfn)

copy_page(initial_page_table, pgd);
initial_page_table[KERNEL_PGD_BOUNDARY] =
- __pgd(__pa(initial_kernel_pmd) | _PAGE_PRESENT);
+ __pgd(__pa_symbol(initial_kernel_pmd) | _PAGE_PRESENT);

set_page_prot(initial_kernel_pmd, PAGE_KERNEL_RO);
set_page_prot(initial_page_table, PAGE_KERNEL_RO);
@@ -2045,8 +2046,8 @@ void __init xen_setup_kernel_pagetable(pgd_t *pgd, unsigned long max_pfn)
pin_pagetable_pfn(MMUEXT_UNPIN_TABLE, PFN_DOWN(__pa(pgd)));

pin_pagetable_pfn(MMUEXT_PIN_L3_TABLE,
- PFN_DOWN(__pa(initial_page_table)));
- xen_write_cr3(__pa(initial_page_table));
+ PFN_DOWN(__pa_symbol(initial_page_table)));
+ xen_write_cr3(__pa_symbol(initial_page_table));

memblock_reserve(__pa(xen_start_info->pt_base),
xen_start_info->nr_pt_frames * PAGE_SIZE);