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| author | Jeremy Fitzhardinge <jeremy@goop.org> | 2009-03-21 03:53:34 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-03-21 19:11:41 +0300 |
| commit | 45c7b28f3c7e3a45cc5a597cc19816a9015ee8ae (patch) | |
| tree | f511d63b355184468d895cd6d60a7ceec9979afc /arch/x86/mm | |
| parent | 0f3507555f6fa4acbc85a646d6e8766230db38fc (diff) | |
| download | linux-45c7b28f3c7e3a45cc5a597cc19816a9015ee8ae.tar.xz | |
Revert "x86: create a non-zero sized bm_pte only when needed"
This reverts commit 698609bdcd35d0641f4c6622c83680ab1a6d67cb.
69860 breaks Xen booting, as it relies on head*.S to set up the fixmap
pagetables (as a side-effect of initializing the USB debug port).
Xen, however, does not boot via head*.S, and so the fixmap area is
not initialized.
The specific symptom of the crash is a fault in dmi_scan(), because
the pointer that early_ioremap returns is not actually present.
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: Jan Beulich <jbeulich@novell.com>
LKML-Reference: <49C43A8E.5090203@goop.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/mm')
| -rw-r--r-- | arch/x86/mm/ioremap.c | 19 |
1 files changed, 3 insertions, 16 deletions
diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c index 55e127f71ed9..83ed74affba9 100644 --- a/arch/x86/mm/ioremap.c +++ b/arch/x86/mm/ioremap.c @@ -487,12 +487,7 @@ static int __init early_ioremap_debug_setup(char *str) early_param("early_ioremap_debug", early_ioremap_debug_setup); static __initdata int after_paging_init; -#define __FIXADDR_TOP (-PAGE_SIZE) -static pte_t bm_pte[(__fix_to_virt(FIX_DBGP_BASE) - ^ __fix_to_virt(FIX_BTMAP_BEGIN)) >> PMD_SHIFT - ? PAGE_SIZE / sizeof(pte_t) : 0] __page_aligned_bss; -#undef __FIXADDR_TOP -static __initdata pte_t *bm_ptep; +static pte_t bm_pte[PAGE_SIZE/sizeof(pte_t)] __page_aligned_bss; static inline pmd_t * __init early_ioremap_pmd(unsigned long addr) { @@ -507,8 +502,6 @@ static inline pmd_t * __init early_ioremap_pmd(unsigned long addr) static inline pte_t * __init early_ioremap_pte(unsigned long addr) { - if (!sizeof(bm_pte)) - return &bm_ptep[pte_index(addr)]; return &bm_pte[pte_index(addr)]; } @@ -526,14 +519,8 @@ void __init early_ioremap_init(void) slot_virt[i] = fix_to_virt(FIX_BTMAP_BEGIN - NR_FIX_BTMAPS*i); pmd = early_ioremap_pmd(fix_to_virt(FIX_BTMAP_BEGIN)); - if (sizeof(bm_pte)) { - memset(bm_pte, 0, sizeof(bm_pte)); - pmd_populate_kernel(&init_mm, pmd, bm_pte); - } else { - bm_ptep = pte_offset_kernel(pmd, 0); - if (early_ioremap_debug) - printk(KERN_INFO "bm_ptep=%p\n", bm_ptep); - } + memset(bm_pte, 0, sizeof(bm_pte)); + pmd_populate_kernel(&init_mm, pmd, bm_pte); /* * The boot-ioremap range spans multiple pmds, for which |