* Re: [PATCH] riscv: fix the global name pfn_base confliction error
2021-07-28 6:43 [PATCH] riscv: fix the global name pfn_base confliction error Kenneth Lee
@ 2021-07-28 6:55 ` Mike Rapoport
2021-07-28 7:08 ` Lee Ken
2021-07-28 7:13 ` Hanjun Guo
2021-07-28 7:19 ` Alex Ghiti
2 siblings, 1 reply; 8+ messages in thread
From: Mike Rapoport @ 2021-07-28 6:55 UTC (permalink / raw)
To: Kenneth Lee
Cc: Paul Walmsley, Palmer Dabbelt, Albert Ou, Alexandre Ghiti,
Anup Patel, Atish Patra, Kenneth Lee, Kefeng Wang, Vitaly Wool,
Guo Ren, Jisheng Zhang, Nick Kossifidis, linux-riscv,
linux-kernel, guohanjun, wangzhou1
On Wed, Jul 28, 2021 at 02:43:18PM +0800, Kenneth Lee wrote:
> From: Kenneth Lee <liguozhu@hisilicon.com>
>
> RISCV use a global variable pfn_base for page/pfn translation. But this
> is a common name and will be used elsewhere. In those case,
> the page-pfn macro which refer this name will refer to the local/input
> variable of those function (such as in vfio_pin_pages_remote). This make
> everything wrong.
>
> This patch change the name from pfn_base to riscv_global_pfn_base to fix
I think global is excessive, just riscv_pfn_base should be ok for proper
namespacing.
> this problem
>
> Signed-off-by: Kenneth Lee <liguozhu@hisilicon.com>
> ---
> arch/riscv/include/asm/page.h | 4 ++--
> arch/riscv/mm/init.c | 6 +++---
> 2 files changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/arch/riscv/include/asm/page.h b/arch/riscv/include/asm/page.h
> index cca8764aed83..8711e415f37c 100644
> --- a/arch/riscv/include/asm/page.h
> +++ b/arch/riscv/include/asm/page.h
> @@ -79,8 +79,8 @@ typedef struct page *pgtable_t;
> #endif
>
> #ifdef CONFIG_MMU
> -extern unsigned long pfn_base;
> -#define ARCH_PFN_OFFSET (pfn_base)
> +extern unsigned long riscv_global_pfn_base;
> +#define ARCH_PFN_OFFSET (riscv_global_pfn_base)
> #else
> #define ARCH_PFN_OFFSET (PAGE_OFFSET >> PAGE_SHIFT)
> #endif /* CONFIG_MMU */
> diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
> index a14bf3910eec..2ce4e9a46ca0 100644
> --- a/arch/riscv/mm/init.c
> +++ b/arch/riscv/mm/init.c
> @@ -228,8 +228,8 @@ static struct pt_alloc_ops _pt_ops __initdata;
> #define pt_ops _pt_ops
> #endif
>
> -unsigned long pfn_base __ro_after_init;
> -EXPORT_SYMBOL(pfn_base);
> +unsigned long riscv_global_pfn_base __ro_after_init;
> +EXPORT_SYMBOL(riscv_global_pfn_base);
>
> pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
> pgd_t trampoline_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
> @@ -572,7 +572,7 @@ asmlinkage void __init setup_vm(uintptr_t dtb_pa)
> kernel_map.va_kernel_pa_offset = kernel_map.virt_addr - kernel_map.phys_addr;
> #endif
>
> - pfn_base = PFN_DOWN(kernel_map.phys_addr);
> + riscv_global_pfn_base = PFN_DOWN(kernel_map.phys_addr);
>
> /*
> * Enforce boot alignment requirements of RV32 and
> --
> 2.25.1
>
--
Sincerely yours,
Mike.
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH] riscv: fix the global name pfn_base confliction error
2021-07-28 6:55 ` Mike Rapoport
@ 2021-07-28 7:08 ` Lee Ken
0 siblings, 0 replies; 8+ messages in thread
From: Lee Ken @ 2021-07-28 7:08 UTC (permalink / raw)
To: Mike Rapoport
Cc: Paul Walmsley, Palmer Dabbelt, Albert Ou, Alexandre Ghiti,
Anup Patel, Atish Patra, Kenneth Lee, Kefeng Wang, Vitaly Wool,
Guo Ren, Jisheng Zhang, Nick Kossifidis, linux-riscv,
linux-kernel, guohanjun, Zhou Wang
indeed. I'll send a new one.
On Wed, Jul 28, 2021 at 2:55 PM Mike Rapoport <rppt@kernel.org> wrote:
>
> On Wed, Jul 28, 2021 at 02:43:18PM +0800, Kenneth Lee wrote:
> > From: Kenneth Lee <liguozhu@hisilicon.com>
> >
> > RISCV use a global variable pfn_base for page/pfn translation. But this
> > is a common name and will be used elsewhere. In those case,
> > the page-pfn macro which refer this name will refer to the local/input
> > variable of those function (such as in vfio_pin_pages_remote). This make
> > everything wrong.
> >
> > This patch change the name from pfn_base to riscv_global_pfn_base to fix
>
> I think global is excessive, just riscv_pfn_base should be ok for proper
> namespacing.
>
> > this problem
> >
> > Signed-off-by: Kenneth Lee <liguozhu@hisilicon.com>
> > ---
> > arch/riscv/include/asm/page.h | 4 ++--
> > arch/riscv/mm/init.c | 6 +++---
> > 2 files changed, 5 insertions(+), 5 deletions(-)
> >
> > diff --git a/arch/riscv/include/asm/page.h b/arch/riscv/include/asm/page.h
> > index cca8764aed83..8711e415f37c 100644
> > --- a/arch/riscv/include/asm/page.h
> > +++ b/arch/riscv/include/asm/page.h
> > @@ -79,8 +79,8 @@ typedef struct page *pgtable_t;
> > #endif
> >
> > #ifdef CONFIG_MMU
> > -extern unsigned long pfn_base;
> > -#define ARCH_PFN_OFFSET (pfn_base)
> > +extern unsigned long riscv_global_pfn_base;
> > +#define ARCH_PFN_OFFSET (riscv_global_pfn_base)
> > #else
> > #define ARCH_PFN_OFFSET (PAGE_OFFSET >> PAGE_SHIFT)
> > #endif /* CONFIG_MMU */
> > diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
> > index a14bf3910eec..2ce4e9a46ca0 100644
> > --- a/arch/riscv/mm/init.c
> > +++ b/arch/riscv/mm/init.c
> > @@ -228,8 +228,8 @@ static struct pt_alloc_ops _pt_ops __initdata;
> > #define pt_ops _pt_ops
> > #endif
> >
> > -unsigned long pfn_base __ro_after_init;
> > -EXPORT_SYMBOL(pfn_base);
> > +unsigned long riscv_global_pfn_base __ro_after_init;
> > +EXPORT_SYMBOL(riscv_global_pfn_base);
> >
> > pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
> > pgd_t trampoline_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
> > @@ -572,7 +572,7 @@ asmlinkage void __init setup_vm(uintptr_t dtb_pa)
> > kernel_map.va_kernel_pa_offset = kernel_map.virt_addr - kernel_map.phys_addr;
> > #endif
> >
> > - pfn_base = PFN_DOWN(kernel_map.phys_addr);
> > + riscv_global_pfn_base = PFN_DOWN(kernel_map.phys_addr);
> >
> > /*
> > * Enforce boot alignment requirements of RV32 and
> > --
> > 2.25.1
> >
>
> --
> Sincerely yours,
> Mike.
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH] riscv: fix the global name pfn_base confliction error
2021-07-28 6:43 [PATCH] riscv: fix the global name pfn_base confliction error Kenneth Lee
2021-07-28 6:55 ` Mike Rapoport
@ 2021-07-28 7:13 ` Hanjun Guo
2021-07-28 7:22 ` Hanjun Guo
2021-07-28 7:19 ` Alex Ghiti
2 siblings, 1 reply; 8+ messages in thread
From: Hanjun Guo @ 2021-07-28 7:13 UTC (permalink / raw)
To: Kenneth Lee, Paul Walmsley, Palmer Dabbelt, Albert Ou,
Alexandre Ghiti, Anup Patel, Atish Patra, Kenneth Lee,
Kefeng Wang, Vitaly Wool, Guo Ren, Jisheng Zhang, Mike Rapoport,
Nick Kossifidis, linux-riscv, linux-kernel
Cc: wangzhou1
On 2021/7/28 14:43, Kenneth Lee wrote:
> From: Kenneth Lee <liguozhu@hisilicon.com>
>
> RISCV use a global variable pfn_base for page/pfn translation. But this
> is a common name and will be used elsewhere. In those case,
> the page-pfn macro which refer this name will refer to the local/input
> variable of those function (such as in vfio_pin_pages_remote). This make
> everything wrong.
>
> This patch change the name from pfn_base to riscv_global_pfn_base to fix
> this problem
>
> Signed-off-by: Kenneth Lee <liguozhu@hisilicon.com>
> ---
> arch/riscv/include/asm/page.h | 4 ++--
> arch/riscv/mm/init.c | 6 +++---
> 2 files changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/arch/riscv/include/asm/page.h b/arch/riscv/include/asm/page.h
> index cca8764aed83..8711e415f37c 100644
> --- a/arch/riscv/include/asm/page.h
> +++ b/arch/riscv/include/asm/page.h
> @@ -79,8 +79,8 @@ typedef struct page *pgtable_t;
> #endif
>
> #ifdef CONFIG_MMU
> -extern unsigned long pfn_base;
> -#define ARCH_PFN_OFFSET (pfn_base)
> +extern unsigned long riscv_global_pfn_base;
> +#define ARCH_PFN_OFFSET (riscv_global_pfn_base)
> #else
> #define ARCH_PFN_OFFSET (PAGE_OFFSET >> PAGE_SHIFT)
> #endif /* CONFIG_MMU */
> diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
> index a14bf3910eec..2ce4e9a46ca0 100644
> --- a/arch/riscv/mm/init.c
> +++ b/arch/riscv/mm/init.c
> @@ -228,8 +228,8 @@ static struct pt_alloc_ops _pt_ops __initdata;
> #define pt_ops _pt_ops
> #endif
>
> -unsigned long pfn_base __ro_after_init;
> -EXPORT_SYMBOL(pfn_base);
> +unsigned long riscv_global_pfn_base __ro_after_init;
> +EXPORT_SYMBOL(riscv_global_pfn_base);
Just nit: I didn't see any driver in kernel refers to
the riscv_global_pfn_base, can we just remove the EXPORT_SYMBOL()？
Thanks
Hanjun
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH] riscv: fix the global name pfn_base confliction error
2021-07-28 7:13 ` Hanjun Guo
@ 2021-07-28 7:22 ` Hanjun Guo
0 siblings, 0 replies; 8+ messages in thread
From: Hanjun Guo @ 2021-07-28 7:22 UTC (permalink / raw)
To: Kenneth Lee, Paul Walmsley, Palmer Dabbelt, Albert Ou,
Alexandre Ghiti, Anup Patel, Atish Patra, Kenneth Lee,
Kefeng Wang, Vitaly Wool, Guo Ren, Jisheng Zhang, Mike Rapoport,
Nick Kossifidis, linux-riscv, linux-kernel
Cc: wangzhou1
On 2021/7/28 15:13, Hanjun Guo wrote:
> On 2021/7/28 14:43, Kenneth Lee wrote:
>> From: Kenneth Lee <liguozhu@hisilicon.com>
>>
>> RISCV use a global variable pfn_base for page/pfn translation. But this
>> is a common name and will be used elsewhere. In those case,
>> the page-pfn macro which refer this name will refer to the local/input
>> variable of those function (such as in vfio_pin_pages_remote). This make
>> everything wrong.
>>
>> This patch change the name from pfn_base to riscv_global_pfn_base to fix
>> this problem
>>
>> Signed-off-by: Kenneth Lee <liguozhu@hisilicon.com>
>> ---
>> arch/riscv/include/asm/page.h | 4 ++--
>> arch/riscv/mm/init.c | 6 +++---
>> 2 files changed, 5 insertions(+), 5 deletions(-)
>>
>> diff --git a/arch/riscv/include/asm/page.h
>> b/arch/riscv/include/asm/page.h
>> index cca8764aed83..8711e415f37c 100644
>> --- a/arch/riscv/include/asm/page.h
>> +++ b/arch/riscv/include/asm/page.h
>> @@ -79,8 +79,8 @@ typedef struct page *pgtable_t;
>> #endif
>> #ifdef CONFIG_MMU
>> -extern unsigned long pfn_base;
>> -#define ARCH_PFN_OFFSET (pfn_base)
>> +extern unsigned long riscv_global_pfn_base;
>> +#define ARCH_PFN_OFFSET (riscv_global_pfn_base)
>> #else
>> #define ARCH_PFN_OFFSET (PAGE_OFFSET >> PAGE_SHIFT)
>> #endif /* CONFIG_MMU */
>> diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
>> index a14bf3910eec..2ce4e9a46ca0 100644
>> --- a/arch/riscv/mm/init.c
>> +++ b/arch/riscv/mm/init.c
>> @@ -228,8 +228,8 @@ static struct pt_alloc_ops _pt_ops __initdata;
>> #define pt_ops _pt_ops
>> #endif
>> -unsigned long pfn_base __ro_after_init;
>> -EXPORT_SYMBOL(pfn_base);
>> +unsigned long riscv_global_pfn_base __ro_after_init;
>> +EXPORT_SYMBOL(riscv_global_pfn_base);
>
> Just nit: I didn't see any driver in kernel refers to
> the riscv_global_pfn_base, can we just remove the EXPORT_SYMBOL()？
Sorry, I'm wrong, will be used by ARCH_PFN_OFFSET...
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH] riscv: fix the global name pfn_base confliction error
2021-07-28 6:43 [PATCH] riscv: fix the global name pfn_base confliction error Kenneth Lee
2021-07-28 6:55 ` Mike Rapoport
2021-07-28 7:13 ` Hanjun Guo
@ 2021-07-28 7:19 ` Alex Ghiti
[not found] ` <CA+CqrBQPou5QuYfHUYzbe7j2AUPpmBQs1HQJgjJo5QtF51LmXw@mail.gmail.com>
2021-07-28 12:52 ` Mike Rapoport
2 siblings, 2 replies; 8+ messages in thread
From: Alex Ghiti @ 2021-07-28 7:19 UTC (permalink / raw)
To: Kenneth Lee, Paul Walmsley, Palmer Dabbelt, Albert Ou,
Anup Patel, Atish Patra, Kenneth Lee, Kefeng Wang, Vitaly Wool,
Guo Ren, Jisheng Zhang, Mike Rapoport, Nick Kossifidis,
linux-riscv, linux-kernel
Cc: guohanjun, wangzhou1
Hi Kenneth,
Le 28/07/2021 à 08:43, Kenneth Lee a écrit :
> From: Kenneth Lee <liguozhu@hisilicon.com>
>
> RISCV use a global variable pfn_base for page/pfn translation. But this
> is a common name and will be used elsewhere. In those case,
> the page-pfn macro which refer this name will refer to the local/input
> variable of those function (such as in vfio_pin_pages_remote). This make
> everything wrong.
>
> This patch change the name from pfn_base to riscv_global_pfn_base to fix
> this problem
What about removing this variable entirely and using
PFN_DOWN(kernel_map.phys_addr) directly in ARCH_PFN_OFFSET definition?
That would remove code from mm/init.c, which is nice :)
Thanks,
Alex
>
> Signed-off-by: Kenneth Lee <liguozhu@hisilicon.com>
> ---
> arch/riscv/include/asm/page.h | 4 ++--
> arch/riscv/mm/init.c | 6 +++---
> 2 files changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/arch/riscv/include/asm/page.h b/arch/riscv/include/asm/page.h
> index cca8764aed83..8711e415f37c 100644
> --- a/arch/riscv/include/asm/page.h
> +++ b/arch/riscv/include/asm/page.h
> @@ -79,8 +79,8 @@ typedef struct page *pgtable_t;
> #endif
>
> #ifdef CONFIG_MMU
> -extern unsigned long pfn_base;
> -#define ARCH_PFN_OFFSET (pfn_base)
> +extern unsigned long riscv_global_pfn_base;
> +#define ARCH_PFN_OFFSET (riscv_global_pfn_base)
> #else
> #define ARCH_PFN_OFFSET (PAGE_OFFSET >> PAGE_SHIFT)
> #endif /* CONFIG_MMU */
> diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
> index a14bf3910eec..2ce4e9a46ca0 100644
> --- a/arch/riscv/mm/init.c
> +++ b/arch/riscv/mm/init.c
> @@ -228,8 +228,8 @@ static struct pt_alloc_ops _pt_ops __initdata;
> #define pt_ops _pt_ops
> #endif
>
> -unsigned long pfn_base __ro_after_init;
> -EXPORT_SYMBOL(pfn_base);
> +unsigned long riscv_global_pfn_base __ro_after_init;
> +EXPORT_SYMBOL(riscv_global_pfn_base);
>
> pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
> pgd_t trampoline_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
> @@ -572,7 +572,7 @@ asmlinkage void __init setup_vm(uintptr_t dtb_pa)
> kernel_map.va_kernel_pa_offset = kernel_map.virt_addr - kernel_map.phys_addr;
> #endif
>
> - pfn_base = PFN_DOWN(kernel_map.phys_addr);
> + riscv_global_pfn_base = PFN_DOWN(kernel_map.phys_addr);
>
> /*
> * Enforce boot alignment requirements of RV32 and
>
^ permalink raw reply [flat|nested] 8+ messages in thread[parent not found: <CA+CqrBQPou5QuYfHUYzbe7j2AUPpmBQs1HQJgjJo5QtF51LmXw@mail.gmail.com>]
* Re: [PATCH] riscv: fix the global name pfn_base confliction error
[not found] ` <CA+CqrBQPou5QuYfHUYzbe7j2AUPpmBQs1HQJgjJo5QtF51LmXw@mail.gmail.com>
@ 2021-07-28 9:08 ` Alex Ghiti
0 siblings, 0 replies; 8+ messages in thread
From: Alex Ghiti @ 2021-07-28 9:08 UTC (permalink / raw)
To: Lee Ken
Cc: Paul Walmsley, Palmer Dabbelt, Albert Ou, moi, Anup Patel,
Atish Patra, Kenneth Lee, Kefeng Wang, Vitaly Wool, Guo Ren,
Jisheng Zhang, Nick Kossifidis, linux-riscv,
linux-kernel@vger.kernel.org List, guohanjun, wangzhou1
Le 28/07/2021 à 09:33, Lee Ken a écrit :
> On Wed, Jul 28, 2021 at 3:19 PM Alex Ghiti <alex@ghiti.fr> wrote:
>>
>> Hi Kenneth,
>>
>> Le 28/07/2021 à 08:43, Kenneth Lee a écrit :
>>> From: Kenneth Lee <liguozhu@hisilicon.com>
>>>
>>> RISCV use a global variable pfn_base for page/pfn translation. But this
>>> is a common name and will be used elsewhere. In those case,
>>> the page-pfn macro which refer this name will refer to the local/input
>>> variable of those function (such as in vfio_pin_pages_remote). This make
>>> everything wrong.
>>>
>>> This patch change the name from pfn_base to riscv_global_pfn_base to fix
>>> this problem
>>
>> What about removing this variable entirely and using
>> PFN_DOWN(kernel_map.phys_addr) directly in ARCH_PFN_OFFSET definition?
>> That would remove code from mm/init.c, which is nice :)
>>
>> Thanks,
>>
>> Alex
>>
>>>
>>> Signed-off-by: Kenneth Lee <liguozhu@hisilicon.com>
>>> ---
>>> arch/riscv/include/asm/page.h | 4 ++--
>>> arch/riscv/mm/init.c | 6 +++---
>>> 2 files changed, 5 insertions(+), 5 deletions(-)
>>>
>>> diff --git a/arch/riscv/include/asm/page.h b/arch/riscv/include/asm/page.h
>>> index cca8764aed83..8711e415f37c 100644
>>> --- a/arch/riscv/include/asm/page.h
>>> +++ b/arch/riscv/include/asm/page.h
>>> @@ -79,8 +79,8 @@ typedef struct page *pgtable_t;
>>> #endif
>>>
>>> #ifdef CONFIG_MMU
>>> -extern unsigned long pfn_base;
>>> -#define ARCH_PFN_OFFSET (pfn_base)
>>> +extern unsigned long riscv_global_pfn_base;
>>> +#define ARCH_PFN_OFFSET (riscv_global_pfn_base)
>>> #else
>>> #define ARCH_PFN_OFFSET (PAGE_OFFSET >> PAGE_SHIFT)
>>> #endif /* CONFIG_MMU */
>>> diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
>>> index a14bf3910eec..2ce4e9a46ca0 100644
>>> --- a/arch/riscv/mm/init.c
>>> +++ b/arch/riscv/mm/init.c
>>> @@ -228,8 +228,8 @@ static struct pt_alloc_ops _pt_ops __initdata;
>>> #define pt_ops _pt_ops
>>> #endif
>>>
>>> -unsigned long pfn_base __ro_after_init;
>>> -EXPORT_SYMBOL(pfn_base);
>>> +unsigned long riscv_global_pfn_base __ro_after_init;
>>> +EXPORT_SYMBOL(riscv_global_pfn_base);
>>>
>>> pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
>>> pgd_t trampoline_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
>>> @@ -572,7 +572,7 @@ asmlinkage void __init setup_vm(uintptr_t dtb_pa)
>>> kernel_map.va_kernel_pa_offset = kernel_map.virt_addr - kernel_map.phys_addr;
>>> #endif
>>>
>>> - pfn_base = PFN_DOWN(kernel_map.phys_addr);
>>> + riscv_global_pfn_base = PFN_DOWN(kernel_map.phys_addr);
>>>
>>> /*
>>> * Enforce boot alignment requirements of RV32 and
>>>
>
> Yes. It is a choice. But I think it is the choice of the maintainer of
> the module. He should have a full consideration on how to expose the
> interface. I'm now just working for VFIO enablement in RISCV. It is
> not wise to be trapped into this;)
>
I think there is a misunderstanding, I suggested to do the following to
get rid of pfn_base entirely:
diff --git a/arch/riscv/include/asm/page.h b/arch/riscv/include/asm/page.h
index adf5b4671684..8afb3db61eb0 100644
--- a/arch/riscv/include/asm/page.h
+++ b/arch/riscv/include/asm/page.h
@@ -79,8 +79,7 @@ typedef struct page *pgtable_t;
#endif
#ifdef CONFIG_MMU
-extern unsigned long pfn_base;
-#define ARCH_PFN_OFFSET (pfn_base)
+#define ARCH_PFN_OFFSET (PFN_DOWN(kernel_map.phys_addr))
#else
#define ARCH_PFN_OFFSET (PAGE_OFFSET >> PAGE_SHIFT)
#endif /* CONFIG_MMU */
diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
index c9a6362d8c7f..c51f0da03a62 100644
--- a/arch/riscv/mm/init.c
+++ b/arch/riscv/mm/init.c
@@ -211,9 +211,6 @@ static void __init setup_bootmem(void)
#ifdef CONFIG_MMU
static struct pt_alloc_ops pt_ops __initdata;
-unsigned long pfn_base __ro_after_init;
-EXPORT_SYMBOL(pfn_base);
-
pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
pgd_t trampoline_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
extern pte_t fixmap_pte[PTRS_PER_PTE];// __page_aligned_bss;
@@ -608,8 +605,6 @@ asmlinkage void __init setup_vm(uintptr_t dtb_pa)
kernel_map.va_pa_offset = PAGE_OFFSET - kernel_map.phys_addr;
kernel_map.va_kernel_pa_offset = kernel_map.virt_addr -
kernel_map.phys_addr;
- pfn_base = PFN_DOWN(kernel_map.phys_addr);
-
/* Sanity check alignment and size */
BUG_ON((PAGE_OFFSET % PGDIR_SIZE) != 0);
BUG_ON((kernel_map.phys_addr % PMD_SIZE) != 0);
^ permalink raw reply related [flat|nested] 8+ messages in thread
* Re: [PATCH] riscv: fix the global name pfn_base confliction error
2021-07-28 7:19 ` Alex Ghiti
[not found] ` <CA+CqrBQPou5QuYfHUYzbe7j2AUPpmBQs1HQJgjJo5QtF51LmXw@mail.gmail.com>
@ 2021-07-28 12:52 ` Mike Rapoport
1 sibling, 0 replies; 8+ messages in thread
From: Mike Rapoport @ 2021-07-28 12:52 UTC (permalink / raw)
To: Alex Ghiti
Cc: Kenneth Lee, Paul Walmsley, Palmer Dabbelt, Albert Ou,
Anup Patel, Atish Patra, Kenneth Lee, Kefeng Wang, Vitaly Wool,
Guo Ren, Jisheng Zhang, Nick Kossifidis, linux-riscv,
linux-kernel, guohanjun, wangzhou1
On Wed, Jul 28, 2021 at 09:19:16AM +0200, Alex Ghiti wrote:
> Hi Kenneth,
>
> Le 28/07/2021 à 08:43, Kenneth Lee a écrit :
> > From: Kenneth Lee <liguozhu@hisilicon.com>
> >
> > RISCV use a global variable pfn_base for page/pfn translation. But this
> > is a common name and will be used elsewhere. In those case,
> > the page-pfn macro which refer this name will refer to the local/input
> > variable of those function (such as in vfio_pin_pages_remote). This make
> > everything wrong.
> >
> > This patch change the name from pfn_base to riscv_global_pfn_base to fix
> > this problem
>
> What about removing this variable entirely and using
> PFN_DOWN(kernel_map.phys_addr) directly in ARCH_PFN_OFFSET definition? That
> would remove code from mm/init.c, which is nice :)
That would be nice, but such change would also change the generated code.
Probably nothing important, but someone would have to at least check what
size and bloat-o-meter say.
> Thanks,
>
> Alex
>
> >
> > Signed-off-by: Kenneth Lee <liguozhu@hisilicon.com>
> > ---
> > arch/riscv/include/asm/page.h | 4 ++--
> > arch/riscv/mm/init.c | 6 +++---
> > 2 files changed, 5 insertions(+), 5 deletions(-)
> >
> > diff --git a/arch/riscv/include/asm/page.h b/arch/riscv/include/asm/page.h
> > index cca8764aed83..8711e415f37c 100644
> > --- a/arch/riscv/include/asm/page.h
> > +++ b/arch/riscv/include/asm/page.h
> > @@ -79,8 +79,8 @@ typedef struct page *pgtable_t;
> > #endif
> > #ifdef CONFIG_MMU
> > -extern unsigned long pfn_base;
> > -#define ARCH_PFN_OFFSET (pfn_base)
> > +extern unsigned long riscv_global_pfn_base;
> > +#define ARCH_PFN_OFFSET (riscv_global_pfn_base)
> > #else
> > #define ARCH_PFN_OFFSET (PAGE_OFFSET >> PAGE_SHIFT)
> > #endif /* CONFIG_MMU */
> > diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
> > index a14bf3910eec..2ce4e9a46ca0 100644
> > --- a/arch/riscv/mm/init.c
> > +++ b/arch/riscv/mm/init.c
> > @@ -228,8 +228,8 @@ static struct pt_alloc_ops _pt_ops __initdata;
> > #define pt_ops _pt_ops
> > #endif
> > -unsigned long pfn_base __ro_after_init;
> > -EXPORT_SYMBOL(pfn_base);
> > +unsigned long riscv_global_pfn_base __ro_after_init;
> > +EXPORT_SYMBOL(riscv_global_pfn_base);
> > pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
> > pgd_t trampoline_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
> > @@ -572,7 +572,7 @@ asmlinkage void __init setup_vm(uintptr_t dtb_pa)
> > kernel_map.va_kernel_pa_offset = kernel_map.virt_addr - kernel_map.phys_addr;
> > #endif
> > - pfn_base = PFN_DOWN(kernel_map.phys_addr);
> > + riscv_global_pfn_base = PFN_DOWN(kernel_map.phys_addr);
> > /*
> > * Enforce boot alignment requirements of RV32 and
> >
--
Sincerely yours,
Mike.
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