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| author | Jeremy Fitzhardinge <jeremy@goop.org> | 2008-06-25 00:19:12 -0400 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-07-08 13:11:01 +0200 |
| commit | eba0045ff87bab465d3c80c289f3bf709c1800f5 (patch) | |
| tree | e015805494c1ddb427fa568619163913270963bd /arch/x86/mm/pgtable.c | |
| parent | 67350a5c4514c280665cdb45439d32a008a264ba (diff) | |
| download | linux-eba0045ff87bab465d3c80c289f3bf709c1800f5.tar.gz linux-eba0045ff87bab465d3c80c289f3bf709c1800f5.tar.bz2 linux-eba0045ff87bab465d3c80c289f3bf709c1800f5.zip | |
x86/paravirt: add a pgd_alloc/free hooks
Add hooks which are called at pgd_alloc/free time. The pgd_alloc hook
may return an error code, which if non-zero, causes the pgd allocation
to be failed. The hooks may be used to allocate/free auxillary
per-pgd information.
also fix:
> * Ingo Molnar <mingo@elte.hu> wrote:
>
> include/asm/pgalloc.h: In function ‘paravirt_pgd_free':
> include/asm/pgalloc.h:14: error: parameter name omitted
> arch/x86/kernel/entry_64.S: In file included from
> arch/x86/kernel/traps_64.c:51:include/asm/pgalloc.h: In function ‘paravirt_pgd_free':
> include/asm/pgalloc.h:14: error: parameter name omitted
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: xen-devel <xen-devel@lists.xensource.com>
Cc: Stephen Tweedie <sct@redhat.com>
Cc: Eduardo Habkost <ehabkost@redhat.com>
Cc: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/mm/pgtable.c')
| -rw-r--r-- | arch/x86/mm/pgtable.c | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/arch/x86/mm/pgtable.c b/arch/x86/mm/pgtable.c index 45b99ac39480..418c4432fb39 100644 --- a/arch/x86/mm/pgtable.c +++ b/arch/x86/mm/pgtable.c @@ -215,13 +215,15 @@ pgd_t *pgd_alloc(struct mm_struct *mm) /* so that alloc_pmd can use it */ mm->pgd = pgd; - if (pgd) + if (pgd) { pgd_ctor(pgd); - if (pgd && !pgd_prepopulate_pmd(mm, pgd)) { - pgd_dtor(pgd); - free_page((unsigned long)pgd); - pgd = NULL; + if (paravirt_pgd_alloc(mm) != 0 || + !pgd_prepopulate_pmd(mm, pgd)) { + pgd_dtor(pgd); + free_page((unsigned long)pgd); + pgd = NULL; + } } return pgd; @@ -231,6 +233,7 @@ void pgd_free(struct mm_struct *mm, pgd_t *pgd) { pgd_mop_up_pmds(mm, pgd); pgd_dtor(pgd); + paravirt_pgd_free(mm, pgd); free_page((unsigned long)pgd); } |