* [PATCH rdma] IB/mlx5: Fix linkage failure on 32-bit arches
@ 2020-02-14 19:13 Alexander Lobakin
2020-02-14 19:24 ` Jason Gunthorpe
0 siblings, 1 reply; 5+ messages in thread
From: Alexander Lobakin @ 2020-02-14 19:13 UTC (permalink / raw)
To: Leon Romanovsky
Cc: Doug Ledford, Jason Gunthorpe, Yishai Hadas, Maxim Mikityanskiy,
linux-rdma, linux-kernel, Alexander Lobakin
Commit f164be8c0366 ("IB/mlx5: Extend caps stage to handle VAR
capabilities") introduced a straight "/" division of the u64
variable "bar_size", which emits an __udivdi3() libgcc call on
32-bit arches and certain GCC versions:
error: "__udivdi3" [drivers/infiniband/hw/mlx5/mlx5_ib.ko] undefined! [1]
Replace it with the corresponding div_u64() call.
Compile-tested on ARCH=mips 32r2el_defconfig BOARDS=ocelot.
[1] https://lore.kernel.org/linux-mips/CAMuHMdXM9S1VkFMZ8eDAyZR6EE4WkJY215Lcn2qdOaPeadF+EQ@mail.gmail.com/
Fixes: f164be8c0366 ("IB/mlx5: Extend caps stage to handle VAR
capabilities")
Signed-off-by: Alexander Lobakin <alobakin@dlink.ru>
---
drivers/infiniband/hw/mlx5/main.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/infiniband/hw/mlx5/main.c b/drivers/infiniband/hw/mlx5/main.c
index e874d688d040..c47530e4d202 100644
--- a/drivers/infiniband/hw/mlx5/main.c
+++ b/drivers/infiniband/hw/mlx5/main.c
@@ -6545,7 +6545,8 @@ static int mlx5_ib_init_var_table(struct mlx5_ib_dev *dev)
doorbell_bar_offset);
bar_size = (1ULL << log_doorbell_bar_size) * 4096;
var_table->stride_size = 1ULL << log_doorbell_stride;
- var_table->num_var_hw_entries = bar_size / var_table->stride_size;
+ var_table->num_var_hw_entries = div_u64(bar_size,
+ var_table->stride_size);
mutex_init(&var_table->bitmap_lock);
var_table->bitmap = bitmap_zalloc(var_table->num_var_hw_entries,
GFP_KERNEL);
--
2.25.0
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH rdma] IB/mlx5: Fix linkage failure on 32-bit arches
2020-02-14 19:13 [PATCH rdma] IB/mlx5: Fix linkage failure on 32-bit arches Alexander Lobakin
@ 2020-02-14 19:24 ` Jason Gunthorpe
2020-02-14 19:44 ` Alexander Lobakin
0 siblings, 1 reply; 5+ messages in thread
From: Jason Gunthorpe @ 2020-02-14 19:24 UTC (permalink / raw)
To: Alexander Lobakin
Cc: Leon Romanovsky, Doug Ledford, Yishai Hadas, Maxim Mikityanskiy,
linux-rdma, linux-kernel
On Fri, Feb 14, 2020 at 10:13:09PM +0300, Alexander Lobakin wrote:
> Commit f164be8c0366 ("IB/mlx5: Extend caps stage to handle VAR
> capabilities") introduced a straight "/" division of the u64
> variable "bar_size", which emits an __udivdi3() libgcc call on
> 32-bit arches and certain GCC versions:
>
> error: "__udivdi3" [drivers/infiniband/hw/mlx5/mlx5_ib.ko] undefined! [1]
>
> Replace it with the corresponding div_u64() call.
> Compile-tested on ARCH=mips 32r2el_defconfig BOARDS=ocelot.
>
> [1] https://lore.kernel.org/linux-mips/CAMuHMdXM9S1VkFMZ8eDAyZR6EE4WkJY215Lcn2qdOaPeadF+EQ@mail.gmail.com/
>
> Fixes: f164be8c0366 ("IB/mlx5: Extend caps stage to handle VAR
> capabilities")
> Signed-off-by: Alexander Lobakin <alobakin@dlink.ru>
> ---
> drivers/infiniband/hw/mlx5/main.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
Randy beat you too it..
https://lore.kernel.org/linux-rdma/20200206143201.GF25297@ziepe.ca/
But it seems patchwork missed this somehow.
Applied now at least
Jason
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH rdma] IB/mlx5: Fix linkage failure on 32-bit arches
2020-02-14 19:24 ` Jason Gunthorpe
@ 2020-02-14 19:44 ` Alexander Lobakin
2020-02-16 11:53 ` Maxim Mikityanskiy
0 siblings, 1 reply; 5+ messages in thread
From: Alexander Lobakin @ 2020-02-14 19:44 UTC (permalink / raw)
To: Jason Gunthorpe
Cc: Leon Romanovsky, Doug Ledford, Yishai Hadas, Maxim Mikityanskiy,
linux-rdma, linux-kernel
Jason Gunthorpe wrote 14.02.2020 22:24:
> On Fri, Feb 14, 2020 at 10:13:09PM +0300, Alexander Lobakin wrote:
>> Commit f164be8c0366 ("IB/mlx5: Extend caps stage to handle VAR
>> capabilities") introduced a straight "/" division of the u64
>> variable "bar_size", which emits an __udivdi3() libgcc call on
>> 32-bit arches and certain GCC versions:
>>
>> error: "__udivdi3" [drivers/infiniband/hw/mlx5/mlx5_ib.ko] undefined!
>> [1]
>>
>> Replace it with the corresponding div_u64() call.
>> Compile-tested on ARCH=mips 32r2el_defconfig BOARDS=ocelot.
>>
>> [1]
>> https://lore.kernel.org/linux-mips/CAMuHMdXM9S1VkFMZ8eDAyZR6EE4WkJY215Lcn2qdOaPeadF+EQ@mail.gmail.com/
>>
>> Fixes: f164be8c0366 ("IB/mlx5: Extend caps stage to handle VAR
>> capabilities")
>> Signed-off-by: Alexander Lobakin <alobakin@dlink.ru>
>> ---
>> drivers/infiniband/hw/mlx5/main.c | 3 ++-
>> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> Randy beat you too it..
>
> https://lore.kernel.org/linux-rdma/20200206143201.GF25297@ziepe.ca/
Ah, OK. Sorry for missing this one. I didn't see any fix over
git.kernel.org and thought it doesn't exist yet.
> But it seems patchwork missed this somehow.
>
> Applied now at least
Thanks!
> Jason
Regards,
ᚷ ᛖ ᚢ ᚦ ᚠ ᚱ
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH rdma] IB/mlx5: Fix linkage failure on 32-bit arches
2020-02-14 19:44 ` Alexander Lobakin
@ 2020-02-16 11:53 ` Maxim Mikityanskiy
2020-02-17 0:36 ` Jason Gunthorpe
0 siblings, 1 reply; 5+ messages in thread
From: Maxim Mikityanskiy @ 2020-02-16 11:53 UTC (permalink / raw)
To: Jason Gunthorpe
Cc: Alexander Lobakin, Leon Romanovsky, Doug Ledford, Yishai Hadas,
linux-rdma, linux-kernel
On 2020-02-14 21:44, Alexander Lobakin wrote:
> Jason Gunthorpe wrote 14.02.2020 22:24:
>> On Fri, Feb 14, 2020 at 10:13:09PM +0300, Alexander Lobakin wrote:
>>> Commit f164be8c0366 ("IB/mlx5: Extend caps stage to handle VAR
>>> capabilities") introduced a straight "/" division of the u64
>>> variable "bar_size", which emits an __udivdi3() libgcc call on
>>> 32-bit arches and certain GCC versions:
>>>
>>> error: "__udivdi3" [drivers/infiniband/hw/mlx5/mlx5_ib.ko] undefined!
>>> [1]
>>>
>>> Replace it with the corresponding div_u64() call.
>>> Compile-tested on ARCH=mips 32r2el_defconfig BOARDS=ocelot.
>>>
>>> [1]
>>> https://lore.kernel.org/linux-mips/CAMuHMdXM9S1VkFMZ8eDAyZR6EE4WkJY215Lcn2qdOaPeadF+EQ@mail.gmail.com/
>>>
>>>
>>> Fixes: f164be8c0366 ("IB/mlx5: Extend caps stage to handle VAR
>>> capabilities")
>>> Signed-off-by: Alexander Lobakin <alobakin@dlink.ru>
>>> ---
>>> drivers/infiniband/hw/mlx5/main.c | 3 ++-
>>> 1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> Randy beat you too it..
>>
>> https://lore.kernel.org/linux-rdma/20200206143201.GF25297@ziepe.ca/
>
> Ah, OK. Sorry for missing this one. I didn't see any fix over
> git.kernel.org and thought it doesn't exist yet.
>
>> But it seems patchwork missed this somehow.
>>
>> Applied now at least
Jason, I think Alexander's patch is more correct. It uses div_u64, while
yours uses div64_u64. The divider is 32-bit, so div_u64 would be more
optimized on most 32-bit architectures.
> Thanks!
>
>> Jason
>
> Regards,
> ᚷ ᛖ ᚢ ᚦ ᚠ ᚱ
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH rdma] IB/mlx5: Fix linkage failure on 32-bit arches
2020-02-16 11:53 ` Maxim Mikityanskiy
@ 2020-02-17 0:36 ` Jason Gunthorpe
0 siblings, 0 replies; 5+ messages in thread
From: Jason Gunthorpe @ 2020-02-17 0:36 UTC (permalink / raw)
To: Maxim Mikityanskiy
Cc: Alexander Lobakin, Leon Romanovsky, Doug Ledford, Yishai Hadas,
linux-rdma, linux-kernel
On Sun, Feb 16, 2020 at 01:53:50PM +0200, Maxim Mikityanskiy wrote:
> On 2020-02-14 21:44, Alexander Lobakin wrote:
> > Jason Gunthorpe wrote 14.02.2020 22:24:
> > > On Fri, Feb 14, 2020 at 10:13:09PM +0300, Alexander Lobakin wrote:
> > > > Commit f164be8c0366 ("IB/mlx5: Extend caps stage to handle VAR
> > > > capabilities") introduced a straight "/" division of the u64
> > > > variable "bar_size", which emits an __udivdi3() libgcc call on
> > > > 32-bit arches and certain GCC versions:
> > > >
> > > > error: "__udivdi3" [drivers/infiniband/hw/mlx5/mlx5_ib.ko]
> > > > undefined! [1]
> > > >
> > > > Replace it with the corresponding div_u64() call.
> > > > Compile-tested on ARCH=mips 32r2el_defconfig BOARDS=ocelot.
> > > >
> > > > [1] https://lore.kernel.org/linux-mips/CAMuHMdXM9S1VkFMZ8eDAyZR6EE4WkJY215Lcn2qdOaPeadF+EQ@mail.gmail.com/
> > > >
> > > >
> > > > Fixes: f164be8c0366 ("IB/mlx5: Extend caps stage to handle VAR
> > > > capabilities")
> > > > Signed-off-by: Alexander Lobakin <alobakin@dlink.ru>
> > > > drivers/infiniband/hw/mlx5/main.c | 3 ++-
> > > > 1 file changed, 2 insertions(+), 1 deletion(-)
> > >
> > > Randy beat you too it..
> > >
> > > https://lore.kernel.org/linux-rdma/20200206143201.GF25297@ziepe.ca/
> >
> > Ah, OK. Sorry for missing this one. I didn't see any fix over
> > git.kernel.org and thought it doesn't exist yet.
> >
> > > But it seems patchwork missed this somehow.
> > >
> > > Applied now at least
>
> Jason, I think Alexander's patch is more correct. It uses div_u64, while
> yours uses div64_u64. The divider is 32-bit, so div_u64 would be more
> optimized on most 32-bit architectures.
Seems so, but it is already done. You can send a followup to fix it
Jason
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2020-02-17 0:36 UTC | newest]
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2020-02-14 19:13 [PATCH rdma] IB/mlx5: Fix linkage failure on 32-bit arches Alexander Lobakin
2020-02-14 19:24 ` Jason Gunthorpe
2020-02-14 19:44 ` Alexander Lobakin
2020-02-16 11:53 ` Maxim Mikityanskiy
2020-02-17 0:36 ` Jason Gunthorpe
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