From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Michael S. Tsirkin" Subject: Re: [PATCH] mm: Make {,set}page_address() static inline if WANT_PAGE_VIRTUAL Date: Wed, 15 Jan 2014 11:46:31 +0200 Message-ID: <20140115094631.GA2107@redhat.com> References: <1389778426-14836-1-git-send-email-geert@linux-m68k.org> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Return-path: Content-Disposition: inline In-Reply-To: <1389778426-14836-1-git-send-email-geert@linux-m68k.org> Sender: owner-linux-mm@kvack.org To: Geert Uytterhoeven Cc: Andrew Morton , Guenter Roeck , linux-mm@kvack.org, linux-bcache@vger.kernel.org, Vineet Gupta , sparclinux@vger.kernel.org, linux-m68k@vger.kernel.org, linux-kernel@vger.kernel.org List-Id: linux-m68k@vger.kernel.org On Wed, Jan 15, 2014 at 10:33:46AM +0100, Geert Uytterhoeven wrote: > {,set}page_address() are macros if WANT_PAGE_VIRTUAL. > If !WANT_PAGE_VIRTUAL, they're plain C functions. >=20 > If someone calls them with a void *, this pointer is auto-converted to > struct page * if !WANT_PAGE_VIRTUAL, but causes a build failure on > architectures using WANT_PAGE_VIRTUAL (arc, m68k and sparc): >=20 > drivers/md/bcache/bset.c: In function =E2=80=98__btree_sort=E2=80=99: > drivers/md/bcache/bset.c:1190: warning: dereferencing =E2=80=98void *=E2= =80=99 pointer > drivers/md/bcache/bset.c:1190: error: request for member =E2=80=98virtu= al=E2=80=99 in something not a structure or union >=20 > Convert them to static inline functions to fix this. There are already > plenty of users of struct page members inside , so there's= no > reason to keep them as macros. >=20 > Signed-off-by: Geert Uytterhoeven FWIW Acked-by: Michael S. Tsirkin > --- > http://kisskb.ellerman.id.au/kisskb/buildresult/10469287/ (m68k/next) > http://kisskb.ellerman.id.au/kisskb/buildresult/10469488/ (sparc64/next= ) > https://lkml.org/lkml/2014/1/13/1044 (m68k & sparc/3.10.27-stable) >=20 > include/linux/mm.h | 13 ++++++++----- > 1 file changed, 8 insertions(+), 5 deletions(-) >=20 > diff --git a/include/linux/mm.h b/include/linux/mm.h > index 35527173cf50..9fac6dd69b11 100644 > --- a/include/linux/mm.h > +++ b/include/linux/mm.h > @@ -846,11 +846,14 @@ static __always_inline void *lowmem_page_address(= const struct page *page) > #endif > =20 > #if defined(WANT_PAGE_VIRTUAL) > -#define page_address(page) ((page)->virtual) > -#define set_page_address(page, address) \ > - do { \ > - (page)->virtual =3D (address); \ > - } while(0) > +static inline void *page_address(const struct page *page) > +{ > + return page->virtual; > +} > +static inline void set_page_address(struct page *page, void *address) > +{ > + page->virtual =3D address; > +} > #define page_address_init() do { } while(0) > #endif > =20 > --=20 > 1.7.9.5 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org