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Date: Wed, 30 Jul 2008 14:51:13 -0700
From: Jeremy Fitzhardinge <jeremy@...p.org>
To: Eduardo Habkost <ehabkost@...hat.com>
CC: Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
Zachary Amsden <zach@...are.com>
Subject: Re: [PATCH] paravirt_ops: Use unsigned long instead of u32 for alloc_p*()
pfn args
Eduardo Habkost wrote:
> This patch changes the pfn args from 'u32' to 'unsigned long'
> on alloc_p*() functions on paravirt_ops, and the corresponding
> implementations for Xen and VMI. The prototypes for CONFIG_PARAVIRT=n
> are already using unsigned long, so paravirt.h now matches the prototypes
> on asm-x86/pgalloc.h.
>
> It shouldn't result in any changes on generated code on 32-bit, with
> or without CONFIG_PARAVIRT. On both cases, 'codiff -f' didn't show any
> change after applying this patch.
>
> On 64-bit, there are (expected) binary changes only when CONFIG_PARAVIRT
> is enabled, as the patch is really supposed to change the size of the
> pfn args.
>
> Signed-off-by: Eduardo Habkost <ehabkost@...hat.com>
>
Acked-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
Cc:ing Zach, since it touches vmi.
J
> ---
> arch/x86/kernel/vmi_32.c | 10 +++++-----
> arch/x86/xen/enlighten.c | 20 ++++++++++----------
> include/asm-x86/paravirt.h | 30 +++++++++++++++---------------
> 3 files changed, 30 insertions(+), 30 deletions(-)
>
> diff --git a/arch/x86/kernel/vmi_32.c b/arch/x86/kernel/vmi_32.c
> index 6832228..c6a758b 100644
> --- a/arch/x86/kernel/vmi_32.c
> +++ b/arch/x86/kernel/vmi_32.c
> @@ -394,13 +394,13 @@ static void *vmi_kmap_atomic_pte(struct page *page, enum km_type type)
> }
> #endif
>
> -static void vmi_allocate_pte(struct mm_struct *mm, u32 pfn)
> +static void vmi_allocate_pte(struct mm_struct *mm, unsigned long pfn)
> {
> vmi_set_page_type(pfn, VMI_PAGE_L1);
> vmi_ops.allocate_page(pfn, VMI_PAGE_L1, 0, 0, 0);
> }
>
> -static void vmi_allocate_pmd(struct mm_struct *mm, u32 pfn)
> +static void vmi_allocate_pmd(struct mm_struct *mm, unsigned long pfn)
> {
> /*
> * This call comes in very early, before mem_map is setup.
> @@ -411,20 +411,20 @@ static void vmi_allocate_pmd(struct mm_struct *mm, u32 pfn)
> vmi_ops.allocate_page(pfn, VMI_PAGE_L2, 0, 0, 0);
> }
>
> -static void vmi_allocate_pmd_clone(u32 pfn, u32 clonepfn, u32 start, u32 count)
> +static void vmi_allocate_pmd_clone(unsigned long pfn, unsigned long clonepfn, unsigned long start, unsigned long count)
> {
> vmi_set_page_type(pfn, VMI_PAGE_L2 | VMI_PAGE_CLONE);
> vmi_check_page_type(clonepfn, VMI_PAGE_L2);
> vmi_ops.allocate_page(pfn, VMI_PAGE_L2 | VMI_PAGE_CLONE, clonepfn, start, count);
> }
>
> -static void vmi_release_pte(u32 pfn)
> +static void vmi_release_pte(unsigned long pfn)
> {
> vmi_ops.release_page(pfn, VMI_PAGE_L1);
> vmi_set_page_type(pfn, VMI_PAGE_NORMAL);
> }
>
> -static void vmi_release_pmd(u32 pfn)
> +static void vmi_release_pmd(unsigned long pfn)
> {
> vmi_ops.release_page(pfn, VMI_PAGE_L2);
> vmi_set_page_type(pfn, VMI_PAGE_NORMAL);
> diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
> index 4b50c0a..33f9559 100644
> --- a/arch/x86/xen/enlighten.c
> +++ b/arch/x86/xen/enlighten.c
> @@ -908,7 +908,7 @@ static int xen_write_msr_safe(unsigned int msr, unsigned low, unsigned high)
>
> /* Early in boot, while setting up the initial pagetable, assume
> everything is pinned. */
> -static __init void xen_alloc_pte_init(struct mm_struct *mm, u32 pfn)
> +static __init void xen_alloc_pte_init(struct mm_struct *mm, unsigned long pfn)
> {
> #ifdef CONFIG_FLATMEM
> BUG_ON(mem_map); /* should only be used early */
> @@ -918,7 +918,7 @@ static __init void xen_alloc_pte_init(struct mm_struct *mm, u32 pfn)
>
> /* Early release_pte assumes that all pts are pinned, since there's
> only init_mm and anything attached to that is pinned. */
> -static void xen_release_pte_init(u32 pfn)
> +static void xen_release_pte_init(unsigned long pfn)
> {
> make_lowmem_page_readwrite(__va(PFN_PHYS(pfn)));
> }
> @@ -934,7 +934,7 @@ static void pin_pagetable_pfn(unsigned cmd, unsigned long pfn)
>
> /* This needs to make sure the new pte page is pinned iff its being
> attached to a pinned pagetable. */
> -static void xen_alloc_ptpage(struct mm_struct *mm, u32 pfn, unsigned level)
> +static void xen_alloc_ptpage(struct mm_struct *mm, unsigned long pfn, unsigned level)
> {
> struct page *page = pfn_to_page(pfn);
>
> @@ -952,12 +952,12 @@ static void xen_alloc_ptpage(struct mm_struct *mm, u32 pfn, unsigned level)
> }
> }
>
> -static void xen_alloc_pte(struct mm_struct *mm, u32 pfn)
> +static void xen_alloc_pte(struct mm_struct *mm, unsigned long pfn)
> {
> xen_alloc_ptpage(mm, pfn, PT_PTE);
> }
>
> -static void xen_alloc_pmd(struct mm_struct *mm, u32 pfn)
> +static void xen_alloc_pmd(struct mm_struct *mm, unsigned long pfn)
> {
> xen_alloc_ptpage(mm, pfn, PT_PMD);
> }
> @@ -1005,7 +1005,7 @@ static void xen_pgd_free(struct mm_struct *mm, pgd_t *pgd)
> }
>
> /* This should never happen until we're OK to use struct page */
> -static void xen_release_ptpage(u32 pfn, unsigned level)
> +static void xen_release_ptpage(unsigned long pfn, unsigned level)
> {
> struct page *page = pfn_to_page(pfn);
>
> @@ -1019,23 +1019,23 @@ static void xen_release_ptpage(u32 pfn, unsigned level)
> }
> }
>
> -static void xen_release_pte(u32 pfn)
> +static void xen_release_pte(unsigned long pfn)
> {
> xen_release_ptpage(pfn, PT_PTE);
> }
>
> -static void xen_release_pmd(u32 pfn)
> +static void xen_release_pmd(unsigned long pfn)
> {
> xen_release_ptpage(pfn, PT_PMD);
> }
>
> #if PAGETABLE_LEVELS == 4
> -static void xen_alloc_pud(struct mm_struct *mm, u32 pfn)
> +static void xen_alloc_pud(struct mm_struct *mm, unsigned long pfn)
> {
> xen_alloc_ptpage(mm, pfn, PT_PUD);
> }
>
> -static void xen_release_pud(u32 pfn)
> +static void xen_release_pud(unsigned long pfn)
> {
> xen_release_ptpage(pfn, PT_PUD);
> }
> diff --git a/include/asm-x86/paravirt.h b/include/asm-x86/paravirt.h
> index e40691c..eca8c4f 100644
> --- a/include/asm-x86/paravirt.h
> +++ b/include/asm-x86/paravirt.h
> @@ -255,13 +255,13 @@ struct pv_mmu_ops {
> * Hooks for allocating/releasing pagetable pages when they're
> * attached to a pagetable
> */
> - void (*alloc_pte)(struct mm_struct *mm, u32 pfn);
> - void (*alloc_pmd)(struct mm_struct *mm, u32 pfn);
> - void (*alloc_pmd_clone)(u32 pfn, u32 clonepfn, u32 start, u32 count);
> - void (*alloc_pud)(struct mm_struct *mm, u32 pfn);
> - void (*release_pte)(u32 pfn);
> - void (*release_pmd)(u32 pfn);
> - void (*release_pud)(u32 pfn);
> + void (*alloc_pte)(struct mm_struct *mm, unsigned long pfn);
> + void (*alloc_pmd)(struct mm_struct *mm, unsigned long pfn);
> + void (*alloc_pmd_clone)(unsigned long pfn, unsigned long clonepfn, unsigned long start, unsigned long count);
> + void (*alloc_pud)(struct mm_struct *mm, unsigned long pfn);
> + void (*release_pte)(unsigned long pfn);
> + void (*release_pmd)(unsigned long pfn);
> + void (*release_pud)(unsigned long pfn);
>
> /* Pagetable manipulation functions */
> void (*set_pte)(pte_t *ptep, pte_t pteval);
> @@ -988,35 +988,35 @@ static inline void paravirt_pgd_free(struct mm_struct *mm, pgd_t *pgd)
> PVOP_VCALL2(pv_mmu_ops.pgd_free, mm, pgd);
> }
>
> -static inline void paravirt_alloc_pte(struct mm_struct *mm, unsigned pfn)
> +static inline void paravirt_alloc_pte(struct mm_struct *mm, unsigned long pfn)
> {
> PVOP_VCALL2(pv_mmu_ops.alloc_pte, mm, pfn);
> }
> -static inline void paravirt_release_pte(unsigned pfn)
> +static inline void paravirt_release_pte(unsigned long pfn)
> {
> PVOP_VCALL1(pv_mmu_ops.release_pte, pfn);
> }
>
> -static inline void paravirt_alloc_pmd(struct mm_struct *mm, unsigned pfn)
> +static inline void paravirt_alloc_pmd(struct mm_struct *mm, unsigned long pfn)
> {
> PVOP_VCALL2(pv_mmu_ops.alloc_pmd, mm, pfn);
> }
>
> -static inline void paravirt_alloc_pmd_clone(unsigned pfn, unsigned clonepfn,
> - unsigned start, unsigned count)
> +static inline void paravirt_alloc_pmd_clone(unsigned long pfn, unsigned long clonepfn,
> + unsigned long start, unsigned long count)
> {
> PVOP_VCALL4(pv_mmu_ops.alloc_pmd_clone, pfn, clonepfn, start, count);
> }
> -static inline void paravirt_release_pmd(unsigned pfn)
> +static inline void paravirt_release_pmd(unsigned long pfn)
> {
> PVOP_VCALL1(pv_mmu_ops.release_pmd, pfn);
> }
>
> -static inline void paravirt_alloc_pud(struct mm_struct *mm, unsigned pfn)
> +static inline void paravirt_alloc_pud(struct mm_struct *mm, unsigned long pfn)
> {
> PVOP_VCALL2(pv_mmu_ops.alloc_pud, mm, pfn);
> }
> -static inline void paravirt_release_pud(unsigned pfn)
> +static inline void paravirt_release_pud(unsigned long pfn)
> {
> PVOP_VCALL1(pv_mmu_ops.release_pud, pfn);
> }
>
--
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