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powerpc_mmu_radix: Introduce 'pmap_abort_ptp'

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This commit moves code for releasing pagetable page references
into a separate function. No functional change intended.

Approved by: markj (mentor)
Differential Revision:  https://reviews.freebsd.org/D45581
This commit is contained in:
Bojan Novković 2024-06-13 18:03:31 +02:00
parent 5d4545a227
commit 200de4dc07
1 changed files with 23 additions and 11 deletions
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34
sys/powerpc/aim/mmu_radix.c
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@ -3137,6 +3137,28 @@ mmu_radix_enter(pmap_t pmap, vm_offset_t va, vm_page_t m,
return (rv);
}
/*
* Release a page table page reference after a failed attempt to create a
* mapping.
*/
static void
pmap_abort_ptp(pmap_t pmap, vm_offset_t va, vm_page_t pdpg)
{
struct spglist free;
SLIST_INIT(&free);
if (pmap_unwire_ptp(pmap, va, pdpg, &free)) {
/*
* Although "va" is not mapped, paging-
* structure caches could nonetheless have
* entries that refer to the freed page table
* pages. Invalidate those entries.
*/
pmap_invalidate_page(pmap, va);
vm_page_free_pages_toq(&free, true);
}
}
/*
* Tries to create a read- and/or execute-only 2MB page mapping. Returns true
* if successful. Returns false if (1) a page table page cannot be allocated
@ -3264,17 +3286,7 @@ pmap_enter_l3e(pmap_t pmap, vm_offset_t va, pml3_entry_t newpde, u_int flags,
* Abort this mapping if its PV entry could not be created.
*/
if (!pmap_pv_insert_l3e(pmap, va, newpde, flags, lockp)) {
SLIST_INIT(&free);
if (pmap_unwire_ptp(pmap, va, pdpg, &free)) {
/*
* Although "va" is not mapped, paging-
* structure caches could nonetheless have
* entries that refer to the freed page table
* pages. Invalidate those entries.
*/
pmap_invalidate_page(pmap, va);
vm_page_free_pages_toq(&free, true);
}
pmap_abort_ptp(pmap, va, pdpg);
if (uwptpg != NULL) {
mt = pmap_remove_pt_page(pmap, va);
KASSERT(mt == uwptpg,