Hi,
On Mon, Mar 31, 2014 at 12:37:40PM -0700, Andrew Morton wrote:
> On Mon, 31 Mar 2014 09:39:37 -0400 Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx> wrote:
>
> > On Mon, Mar 31, 2014 at 05:08:49PM +0800, kbuild test robot wrote:
> > > tree: git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
> > > head: 8a896813a328f23aeee5f56d3139361534796636
> > > commit: 64aa967f459ba0bb91ea8b127c9bd586db1beabc [114/486] pagemap: redefine callback functions for page table walker
> > > config: x86_64-randconfig-br2-03311043 (attached as .config)
> > >
> > > Note: the next/master HEAD 8a896813a328f23aeee5f56d3139361534796636 builds fine.
> > > It only hurts bisectibility.
> > >
> > > All error/warnings:
> > >
> > > fs/proc/task_mmu.c: In function 'pagemap_read':
> > > >> fs/proc/task_mmu.c:1120:31: error: 'pagemap_hugetlb' undeclared (first use in this function)
> > > pagemap_walk.hugetlb_entry = pagemap_hugetlb;
> > > ^
> > > fs/proc/task_mmu.c:1120:31: note: each undeclared identifier is reported only once for each function it appears in
> > > fs/proc/task_mmu.c: At top level:
> > > fs/proc/task_mmu.c:1025:12: warning: 'pagemap_hugetlb_range' defined but not used [-Wunused-function]
> > > static int pagemap_hugetlb_range(pte_t *pte, unsigned long hmask,
> > > ^
> >
> > pagemap_hugetlb_range() should be renamed to pagemap_hugetlb() at 64aa967f459b
> > ("pagemap: redefine callback functions for page table walker"), while it is
> > currently done by dc86a8715d79 ("pagewalk: remove argument hmask from
> > hugetlb_entry()") afterward like below:
> >
> > @@ -1022,8 +1022,7 @@ static void huge_pte_to_pagemap_entry(pagemap_entry_t *pme, struct pagemapread *
> > }
> >
> > /* This function walks within one hugetlb entry in the single call */
> > -static int pagemap_hugetlb_range(pte_t *pte, unsigned long hmask,
> > - unsigned long addr, unsigned long end,
> > +static int pagemap_hugetlb(pte_t *pte, unsigned long addr, unsigned long end,
> > struct mm_walk *walk)
> > {
> > struct pagemapread *pm = walk->private;
> >
> > Obviously, dc86a8715d79 should only remove hmask.
> > Sorry for my poor patch separation.
>
> It gets messy. I tried this
> pagemap-redefine-callback-functions-for-page-table-walker-fix.patch:
>
>
> --- a/fs/proc/task_mmu.c~pagemap-redefine-callback-functions-for-page-table-walker-fix
> +++ a/fs/proc/task_mmu.c
> @@ -1022,15 +1022,15 @@ static void huge_pte_to_pagemap_entry(pa
> }
>
> /* This function walks within one hugetlb entry in the single call */
> -static int pagemap_hugetlb_range(pte_t *pte, unsigned long hmask,
> - unsigned long addr, unsigned long end,
> - struct mm_walk *walk)
> +static int pagemap_hugetlb(pte_t *pte, unsigned long addr, unsigned long end,
> + struct mm_walk *walk)
We can't remove hmask here, because the number of arguments of callback
hugetlb_entry() in struct mm_walk is not changed at this patch.
Just renaming in pagemap-redefine-callback-functions-for-page-table-walker-fix.patch
is fine.
Thanks,
Naoya Horiguchi
> {
> struct pagemapread *pm = walk->private;
> struct vm_area_struct *vma = walk->vma;
> int err = 0;
> int flags2;
> pagemap_entry_t pme;
> + unsigned long hmask;
>
> WARN_ON_ONCE(!vma);
>
>
> and got
>
> fs/proc/task_mmu.c: In function 'pagemap_read':
> fs/proc/task_mmu.c:1120: warning: assignment from incompatible pointer type
>
> from
>
> #ifdef CONFIG_HUGETLB_PAGE
> pagemap_walk.hugetlb_entry = pagemap_hugetlb;
> #endif
>
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