On Wed, Apr 21, 2021 at 10:43 AM David Laight wrote:
> From: Arnd Bergmann Sent: 20 April 2021 22:20
> > On Tue, Apr 20, 2021 at 11:14 PM Vineet Gupta
> > wrote:
> > > On 4/20/21 12:07 AM, Arnd Bergmann wrote:
> >
> > > >
> > > > which means that half the 32-bit architectures do this. This may
From: Arnd Bergmann
> Sent: 20 April 2021 22:20
>
> On Tue, Apr 20, 2021 at 11:14 PM Vineet Gupta
> wrote:
> > On 4/20/21 12:07 AM, Arnd Bergmann wrote:
>
> > >
> > > which means that half the 32-bit architectures do this. This may
> > > cause more problems when arc and/or microblaze want to
On Tue, Apr 20, 2021 at 11:20:19PM +0200, Arnd Bergmann wrote:
> In that case, there should be no problem for you.
>
> The main issue is with system calls and ioctls that contain a misaligned
> struct member like
>
> struct s {
>u32 a;
>u64 b;
> };
>
> Passing this structure by
On 4/20/21 12:07 AM, Arnd Bergmann wrote:
> On Tue, Apr 20, 2021 at 5:10 AM Matthew Wilcox wrote:
>> On Tue, Apr 20, 2021 at 02:48:17AM +, Vineet Gupta wrote:
32-bit architectures which expect 8-byte alignment for 8-byte integers
and need 64-bit DMA addresses (arc, arm, mips, ppc)
On Tue, Apr 20, 2021 at 11:14 PM Vineet Gupta
wrote:
> On 4/20/21 12:07 AM, Arnd Bergmann wrote:
> >
> > which means that half the 32-bit architectures do this. This may
> > cause more problems when arc and/or microblaze want to support
> > 64-bit kernels and compat mode in the future on their
On Tue, Apr 20, 2021 at 09:39:54AM +0200, Geert Uytterhoeven wrote:
> > +++ b/include/linux/mm_types.h
> > @@ -97,10 +97,10 @@ struct page {
> > };
> > struct {/* page_pool used by netstack */
> > /**
> > -*
From: Geert Uytterhoeven
> Sent: 20 April 2021 08:40
>
> Hi Willy,
>
> On Sat, Apr 17, 2021 at 4:49 AM Matthew Wilcox wrote:
> > Replacement patch to fix compiler warning.
> >
> > 32-bit architectures which expect 8-byte alignment for 8-byte integers
> > and need 64-bit DMA addresses (arc, arm,
Hi Willy,
On Sat, Apr 17, 2021 at 4:49 AM Matthew Wilcox wrote:
> Replacement patch to fix compiler warning.
>
> From: "Matthew Wilcox (Oracle)"
> Date: Fri, 16 Apr 2021 16:34:55 -0400
> Subject: [PATCH 1/2] mm: Fix struct page layout on 32-bit systems
> To: bro...@redhat.com
> Cc:
On 17/04/2021 01.07, Matthew Wilcox (Oracle) wrote:
> 32-bit architectures which expect 8-byte alignment for 8-byte integers
> and need 64-bit DMA addresses (arc, arm, mips, ppc) had their struct
> page inadvertently expanded in 2019. When the dma_addr_t was added,
> it forced the alignment of
On Tue, Apr 20, 2021 at 5:10 AM Matthew Wilcox wrote:
>
> On Tue, Apr 20, 2021 at 02:48:17AM +, Vineet Gupta wrote:
> > > 32-bit architectures which expect 8-byte alignment for 8-byte integers
> > > and need 64-bit DMA addresses (arc, arm, mips, ppc) had their struct
> > > page inadvertently
Hi Matthew,
On 4/16/21 7:45 PM, Matthew Wilcox wrote:
> Replacement patch to fix compiler warning.
>
> From: "Matthew Wilcox (Oracle)"
> Date: Fri, 16 Apr 2021 16:34:55 -0400
> Subject: [PATCH 1/2] mm: Fix struct page layout on 32-bit systems
> To: bro...@redhat.com
> Cc:
On Tue, Apr 20, 2021 at 02:48:17AM +, Vineet Gupta wrote:
> > 32-bit architectures which expect 8-byte alignment for 8-byte integers
> > and need 64-bit DMA addresses (arc, arm, mips, ppc) had their struct
> > page inadvertently expanded in 2019.
>
> FWIW, ARC doesn't require 8 byte alignment
On Sat, Apr 17, 2021 at 09:22:40PM +0100, Matthew Wilcox wrote:
> On Sat, Apr 17, 2021 at 09:32:06PM +0300, Ilias Apalodimas wrote:
> > > +static inline void page_pool_set_dma_addr(struct page *page, dma_addr_t
> > > addr)
> > > +{
> > > + page->dma_addr[0] = addr;
> > > + if (sizeof(dma_addr_t)
On Sat, Apr 17, 2021 at 09:18:57PM +, David Laight wrote:
> Ugly as well.
Thank you for expressing your opinion. Again.
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From: Matthew Wilcox
> Sent: 17 April 2021 03:45
>
> Replacement patch to fix compiler warning.
...
> static inline dma_addr_t page_pool_get_dma_addr(struct page *page)
> {
> - return page->dma_addr;
> + dma_addr_t ret = page->dma_addr[0];
> + if (sizeof(dma_addr_t) >
Hi Matthew,
On Sat, Apr 17, 2021 at 03:45:22AM +0100, Matthew Wilcox wrote:
>
> Replacement patch to fix compiler warning.
>
> From: "Matthew Wilcox (Oracle)"
> Date: Fri, 16 Apr 2021 16:34:55 -0400
> Subject: [PATCH 1/2] mm: Fix struct page layout on 32-bit systems
> To: bro...@redhat.com
>
On Sat, 17 Apr 2021 00:07:23 +0100
"Matthew Wilcox (Oracle)" wrote:
> 32-bit architectures which expect 8-byte alignment for 8-byte integers
> and need 64-bit DMA addresses (arc, arm, mips, ppc) had their struct
> page inadvertently expanded in 2019. When the dma_addr_t was added,
> it forced
Replacement patch to fix compiler warning.
From: "Matthew Wilcox (Oracle)"
Date: Fri, 16 Apr 2021 16:34:55 -0400
Subject: [PATCH 1/2] mm: Fix struct page layout on 32-bit systems
To: bro...@redhat.com
Cc: linux-ker...@vger.kernel.org,
linux...@kvack.org,
net...@vger.kernel.org,
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