| Message ID | 20200402081614.5696-1-rppt@kernel.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | mips: define pud_index() regardless of page table folding | expand |
Tested-by: Huacai Chen <chenhc@lemote.com> On Thu, Apr 2, 2020 at 4:17 PM Mike Rapoport <rppt@kernel.org> wrote: > > From: Mike Rapoport <rppt@linux.ibm.com> > > Commit 31168f033e37 ("mips: drop __pXd_offset() macros that duplicate > pXd_index() ones") is correct that pud_index() & __pud_offset() are the > same when pud_index() is actually provided, however it does not take into > account the __PAGETABLE_PUD_FOLDED case. This has broken MIPS KVM > compilation because it relied on availability of pud_index(). > > Define pud_index() regardless of page table folded. It will evaluate to > actual index for 4-level pagetables and to 0 for folded PUD level. > > Link: https://lore.kernel.org/lkml/20200331154749.5457-1-pbonzini@redhat.com > Reported-by: Paolo Bonzini <pbonzini@redhat.com> > Signed-off-by: Mike Rapoport <rppt@linux.ibm.com> > --- > arch/mips/include/asm/pgtable-64.h | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/arch/mips/include/asm/pgtable-64.h b/arch/mips/include/asm/pgtable-64.h > index f92716cfa4f4..ee5dc0c145b9 100644 > --- a/arch/mips/include/asm/pgtable-64.h > +++ b/arch/mips/include/asm/pgtable-64.h > @@ -172,6 +172,8 @@ > > extern pte_t invalid_pte_table[PTRS_PER_PTE]; > > +#define pud_index(address) (((address) >> PUD_SHIFT) & (PTRS_PER_PUD - 1)) > + > #ifndef __PAGETABLE_PUD_FOLDED > /* > * For 4-level pagetables we defines these ourselves, for 3-level the > @@ -210,8 +212,6 @@ static inline void p4d_clear(p4d_t *p4dp) > p4d_val(*p4dp) = (unsigned long)invalid_pud_table; > } > > -#define pud_index(address) (((address) >> PUD_SHIFT) & (PTRS_PER_PUD - 1)) > - > static inline unsigned long p4d_page_vaddr(p4d_t p4d) > { > return p4d_val(p4d); > -- > 2.25.1 >
On 4/2/20 10:16 AM, Mike Rapoport wrote: > From: Mike Rapoport <rppt@linux.ibm.com> > > Commit 31168f033e37 ("mips: drop __pXd_offset() macros that duplicate > pXd_index() ones") is correct that pud_index() & __pud_offset() are the > same when pud_index() is actually provided, however it does not take into > account the __PAGETABLE_PUD_FOLDED case. This has broken MIPS KVM > compilation because it relied on availability of pud_index(). > > Define pud_index() regardless of page table folded. It will evaluate to > actual index for 4-level pagetables and to 0 for folded PUD level. > > Link: https://lore.kernel.org/lkml/20200331154749.5457-1-pbonzini@redhat.com > Reported-by: Paolo Bonzini <pbonzini@redhat.com> > Signed-off-by: Mike Rapoport <rppt@linux.ibm.com> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> > --- > arch/mips/include/asm/pgtable-64.h | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/arch/mips/include/asm/pgtable-64.h b/arch/mips/include/asm/pgtable-64.h > index f92716cfa4f4..ee5dc0c145b9 100644 > --- a/arch/mips/include/asm/pgtable-64.h > +++ b/arch/mips/include/asm/pgtable-64.h > @@ -172,6 +172,8 @@ > > extern pte_t invalid_pte_table[PTRS_PER_PTE]; > > +#define pud_index(address) (((address) >> PUD_SHIFT) & (PTRS_PER_PUD - 1)) > + > #ifndef __PAGETABLE_PUD_FOLDED > /* > * For 4-level pagetables we defines these ourselves, for 3-level the > @@ -210,8 +212,6 @@ static inline void p4d_clear(p4d_t *p4dp) > p4d_val(*p4dp) = (unsigned long)invalid_pud_table; > } > > -#define pud_index(address) (((address) >> PUD_SHIFT) & (PTRS_PER_PUD - 1)) > - > static inline unsigned long p4d_page_vaddr(p4d_t p4d) > { > return p4d_val(p4d); >
On Thu, Apr 02, 2020 at 11:16:14AM +0300, Mike Rapoport wrote: > From: Mike Rapoport <rppt@linux.ibm.com> > > Commit 31168f033e37 ("mips: drop __pXd_offset() macros that duplicate > pXd_index() ones") is correct that pud_index() & __pud_offset() are the > same when pud_index() is actually provided, however it does not take into > account the __PAGETABLE_PUD_FOLDED case. This has broken MIPS KVM > compilation because it relied on availability of pud_index(). > > Define pud_index() regardless of page table folded. It will evaluate to > actual index for 4-level pagetables and to 0 for folded PUD level. > > Link: https://lore.kernel.org/lkml/20200331154749.5457-1-pbonzini@redhat.com > Reported-by: Paolo Bonzini <pbonzini@redhat.com> > Signed-off-by: Mike Rapoport <rppt@linux.ibm.com> > --- > arch/mips/include/asm/pgtable-64.h | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) applied to mips-next. Thomas.
diff --git a/arch/mips/include/asm/pgtable-64.h b/arch/mips/include/asm/pgtable-64.h index f92716cfa4f4..ee5dc0c145b9 100644 --- a/arch/mips/include/asm/pgtable-64.h +++ b/arch/mips/include/asm/pgtable-64.h @@ -172,6 +172,8 @@ extern pte_t invalid_pte_table[PTRS_PER_PTE]; +#define pud_index(address) (((address) >> PUD_SHIFT) & (PTRS_PER_PUD - 1)) + #ifndef __PAGETABLE_PUD_FOLDED /* * For 4-level pagetables we defines these ourselves, for 3-level the @@ -210,8 +212,6 @@ static inline void p4d_clear(p4d_t *p4dp) p4d_val(*p4dp) = (unsigned long)invalid_pud_table; } -#define pud_index(address) (((address) >> PUD_SHIFT) & (PTRS_PER_PUD - 1)) - static inline unsigned long p4d_page_vaddr(p4d_t p4d) { return p4d_val(p4d);