linux-kernel - Re: [PATCHv3 1/2] mm: introduce vm_ops->map

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Date:	Wed, 5 Mar 2014 12:02:43 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>, Rik van Riel <riel@...hat.com>,
	Andi Kleen <ak@...ux.intel.com>,
	Matthew Wilcox <matthew.r.wilcox@...el.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Dave Chinner <david@...morbit.com>, Ning Qu <quning@...il.com>,
	linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCHv3 1/2] mm: introduce vm_ops->map_pages()

On Wed, 05 Mar 2014 10:34:15 +1030 Rusty Russell <rusty@...tcorp.com.au> wrote:

> Andrew Morton <akpm@...ux-foundation.org> writes:
> > On Thu, 27 Feb 2014 21:53:46 +0200 "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com> wrote:
> >> +
> >> +void do_set_pte(struct vm_area_struct *vma, unsigned long address,
> >> +		struct page *page, pte_t *pte, bool write, bool anon);
> >>  #endif
> >>  
> >>  /*
> >
> > lguest made a dubious naming decision:
> >
> > drivers/lguest/page_tables.c:890: error: conflicting types for 'do_set_pte'
> > include/linux/mm.h:593: note: previous declaration of 'do_set_pte' was here
> >
> > I'll rename lguest's do_set_pte() to do_guest_set_pte() as a
> > preparatory patch.
> 
> s/do_/ if you don't mind; if we're going to prefix it, we don't need the
> extra verb.

drivers/lguest/page_tables.c already has a guest_set_pte(), which calls
do_guest_set_pte().

How about we use the __ tradition, so __guest_set_pte() is a helper for
guest_set_pte()?


--- a/drivers/lguest/page_tables.c~drivers-lguest-page_tablesc-rename-do_set_pte
+++ a/drivers/lguest/page_tables.c
@@ -887,7 +887,7 @@ void guest_new_pagetable(struct lg_cpu *
  * _PAGE_ACCESSED then we can put a read-only PTE entry in immediately, and if
  * they set _PAGE_DIRTY then we can put a writable PTE entry in immediately.
  */
-static void do_set_pte(struct lg_cpu *cpu, int idx,
+static void __guest_set_pte(struct lg_cpu *cpu, int idx,
 		       unsigned long vaddr, pte_t gpte)
 {
 	/* Look up the matching shadow page directory entry. */
@@ -960,13 +960,13 @@ void guest_set_pte(struct lg_cpu *cpu,
 		unsigned int i;
 		for (i = 0; i < ARRAY_SIZE(cpu->lg->pgdirs); i++)
 			if (cpu->lg->pgdirs[i].pgdir)
-				do_set_pte(cpu, i, vaddr, gpte);
+				__guest_set_pte(cpu, i, vaddr, gpte);
 	} else {
 		/* Is this page table one we have a shadow for? */
 		int pgdir = find_pgdir(cpu->lg, gpgdir);
 		if (pgdir != ARRAY_SIZE(cpu->lg->pgdirs))
 			/* If so, do the update. */
-			do_set_pte(cpu, pgdir, vaddr, gpte);
+			__guest_set_pte(cpu, pgdir, vaddr, gpte);
 	}
 }
 
_

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