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SubjectRe: [PATCH] ttm: Fix a potential comparison of structs.
On Sun, 02 Aug 2009 20:12:18 +0200
Thomas Hellström <thellstrom@vmware.com> wrote:

> Pekka Paalanen skrev:
> > From 5e2851952729b287a82efa002b28a2095404d44d Mon Sep 17 00:00:00 2001
> > From: Thomas Hellstrom <thellstrom@vmware.com>
> > Date: Fri, 31 Jul 2009 10:47:51 +0200
> > Subject: [PATCH] ttm: Fix a potential comparison of structs.
> >
> > On some architectures the comparison may cause a compilation failure.
> >
> > Original partial fix Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
> >
> > Signed-off-by: Pekka Paalanen <pq@iki.fi>
> > ---
> >
> > Thomas, you forgot two more of these :-)
> > Here's a patch that actually compiles on x86_64.
> >
>
> Pekka,
> Thanks for fixing this! (Just for clarity, i assume you mean that the
> non-x86 part now compiles on x86?)

Ah yes, that's what I mean. I changed the #ifdefs for my compat fix in
http://cgit.freedesktop.org/nouveau/linux-2.6/log/?h=master-compat
and tried compiling it the both ways.

> Dave, is there a chance to have this in 2.6.31? Compilation errors are
> bad, although probably nobody has been hitting this yet..

Well, Nouveau master-compat users would have hit it, but I added your
fix, too. Users with x86_32 highmem kernels already hit the
kmap_atomic_prot not exported bug while building the latest DRM,
TTM and Nouveau bits against distro kernels.

So yeah, no-one anyone (else) would care about ;-)


Thanks.

>
> /Thomas
>
> > drivers/gpu/drm/ttm/ttm_bo_util.c | 8 ++++----
> > 1 files changed, 4 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/ttm/ttm_bo_util.c b/drivers/gpu/drm/ttm/ttm_bo_util.c
> > index f4e2eba..999fbe7 100644
> > --- a/drivers/gpu/drm/ttm/ttm_bo_util.c
> > +++ b/drivers/gpu/drm/ttm/ttm_bo_util.c
> > @@ -151,7 +151,7 @@ static int ttm_copy_io_ttm_page(struct ttm_tt *ttm, void *src,
> > #ifdef CONFIG_X86
> > dst = kmap_atomic_prot(d, KM_USER0, prot);
> > #else
> > - if (prot != PAGE_KERNEL)
> > + if (pgprot_val(prot) != pgprot_val(PAGE_KERNEL))
> > dst = vmap(&d, 1, 0, prot);
> > else
> > dst = kmap(d);
> > @@ -164,7 +164,7 @@ static int ttm_copy_io_ttm_page(struct ttm_tt *ttm, void *src,
> > #ifdef CONFIG_X86
> > kunmap_atomic(dst, KM_USER0);
> > #else
> > - if (prot != PAGE_KERNEL)
> > + if (pgprot_val(prot) != pgprot_val(PAGE_KERNEL))
> > vunmap(dst);
> > else
> > kunmap(d);
> > @@ -187,7 +187,7 @@ static int ttm_copy_ttm_io_page(struct ttm_tt *ttm, void *dst,
> > #ifdef CONFIG_X86
> > src = kmap_atomic_prot(s, KM_USER0, prot);
> > #else
> > - if (prot != PAGE_KERNEL)
> > + if (pgprot_val(prot) != pgprot_val(PAGE_KERNEL))
> > src = vmap(&s, 1, 0, prot);
> > else
> > src = kmap(s);
> > @@ -200,7 +200,7 @@ static int ttm_copy_ttm_io_page(struct ttm_tt *ttm, void *dst,
> > #ifdef CONFIG_X86
> > kunmap_atomic(src, KM_USER0);
> > #else
> > - if (prot != PAGE_KERNEL)
> > + if (pgprot_val(prot) != pgprot_val(PAGE_KERNEL))
> > vunmap(src);
> > else
> > kunmap(s);

--
Pekka Paalanen
http://www.iki.fi/pq/

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