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    SubjectRe: 4MB pages and framebuffer access, x11perf results, 2.1.125
    On Wed, 28 Oct 1998, MOLNAR Ingo wrote:

    >--- linux/mm/memory.c.orig Wed Oct 28 02:10:37 1998
    >+++ linux/mm/memory.c Wed Oct 28 06:13:24 1998
    >@@ -254,7 +254,13 @@
    > goto skip_copy_pte_range;
    > if (pmd_bad(*src_pmd)) {
    > printk("copy_pte_range: bad pmd (%08lx)\n", pmd_val(*src_pmd));
    >+/* dont even try to look ... */
    >+#if 0
    > pmd_clear(src_pmd);
    >+#else
    >+ pmd_val(*dst_pmd) = pmd_val(*src_pmd);
    >+#endif
    >+
    > skip_copy_pte_range: address = (address + PMD_SIZE) & PMD_MASK;
    > if (address >= end)
    > goto out;

    This should be clean doable adding a pmd_only() to tell if the pmd does
    not need a pte to get the info about phys space. Other arch (and <P5) can
    #define pmd_only() 0.

    >--- linux/mm/mmap.c.orig Wed Oct 28 00:06:29 1998
    >+++ linux/mm/mmap.c Wed Oct 28 06:14:35 1998
    >@@ -164,6 +164,12 @@
    > struct vm_area_struct * vma;
    > int correct_wcount = 0, error;
    >
    >+ if (off == 0xfc000000) {
    >+ addr = 0x44000000;
    >+ len = 0x00400000;
    >+ flags |= VM_LOCKED;
    >+ }
    >+
    > if ((len = PAGE_ALIGN(len)) == 0)
    > return addr;
    >

    Why you need this? Shound' t X that should set these values at first?

    Andrea Arcangeli


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