From 45c7b28f3c7e3a45cc5a597cc19816a9015ee8ae Mon Sep 17 00:00:00 2001 From: Jeremy Fitzhardinge Date: Fri, 20 Mar 2009 17:53:34 -0700 Subject: [PATCH] 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 Cc: Jan Beulich LKML-Reference: <49C43A8E.5090203@goop.org> Signed-off-by: Ingo Molnar --- arch/x86/mm/ioremap.c | 19 +++---------------- 1 file changed, 3 insertions(+), 16 deletions(-) diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c index 55e127f71ed..83ed74affba 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 -- 2.39.5