wireguard-linux/include/asm-ppc/pgtable.h, branch stable

powerpc: Remove arch/ppc and include/asm-ppc

2008-06-10T11:40:22Z

All the maintained platforms are now in arch/powerpc, so the old arch/ppc stuff can now go away. Acked-by: Adrian Bunk Acked-by: Arnd Bergmann Acked-by: Becky Bruce Acked-by: Benjamin Herrenschmidt Acked-by: Geert Uytterhoeven Acked-by: Grant Likely Acked-by: Jochen Friedrich Acked-by: John Linn Acked-by: Jon Loeliger Acked-by: Josh Boyer Acked-by: Kumar Gala Acked-by: Olof Johansson Acked-by: Peter Korsgaard Acked-by: Scott Wood Acked-by: Sean MacLennan Acked-by: Segher Boessenkool Acked-by: Stefan Roese Acked-by: Stephen Neuendorffer Acked-by: Wolfgang Denk Signed-off-by: Paul Mackerras

mm: introduce pte_special pte bit

2008-04-28T15:58:23Z

s390 for one, cannot implement VM_MIXEDMAP with pfn_valid, due to their memory model (which is more dynamic than most). Instead, they had proposed to implement it with an additional path through vm_normal_page(), using a bit in the pte to determine whether or not the page should be refcounted: vm_normal_page() { ... if (unlikely(vma->vm_flags & (VM_PFNMAP|VM_MIXEDMAP))) { if (vma->vm_flags & VM_MIXEDMAP) { #ifdef s390 if (!mixedmap_refcount_pte(pte)) return NULL; #else if (!pfn_valid(pfn)) return NULL; #endif goto out; } ... } This is fine, however if we are allowed to use a bit in the pte to determine refcountedness, we can use that to _completely_ replace all the vma based schemes. So instead of adding more cases to the already complex vma-based scheme, we can have a clearly seperate and simple pte-based scheme (and get slightly better code generation in the process): vm_normal_page() { #ifdef s390 if (!mixedmap_refcount_pte(pte)) return NULL; return pte_page(pte); #else ... #endif } And finally, we may rather make this concept usable by any architecture rather than making it s390 only, so implement a new type of pte state for this. Unfortunately the old vma based code must stay, because some architectures may not be able to spare pte bits. This makes vm_normal_page a little bit more ugly than we would like, but the 2 cases are clearly seperate. So introduce a pte_special pte state, and use it in mm/memory.c. It is currently a noop for all architectures, so this doesn't actually result in any compiled code changes to mm/memory.o. BTW: I haven't put vm_normal_page() into arch code as-per an earlier suggestion. The reason is that, regardless of where vm_normal_page is actually implemented, the *abstraction* is still exactly the same. Also, while it depends on whether the architecture has pte_special or not, that is the only two possible cases, and it really isn't an arch specific function -- the role of the arch code should be to provide primitive functions and accessors with which to build the core code; pte_special does that. We do not want architectures to know or care about vm_normal_page itself, and we definitely don't want them being able to invent something new there out of sight of mm/ code. If we made vm_normal_page an arch function, then we have to make vm_insert_mixed (next patch) an arch function too. So I don't think moving it to arch code fundamentally improves any abstractions, while it does practically make the code more difficult to follow, for both mm and arch developers, and easier to misuse. [akpm@linux-foundation.org: build fix] Signed-off-by: Nick Piggin Acked-by: Carsten Otte Cc: Jared Hulbert Cc: Martin Schwidefsky Cc: Heiko Carstens Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[PPC] 8xx: swap bug-fix

2008-03-07T22:56:54Z

This makes swap routines operate correctly on the ppc_8xx based machines. Recent kernel's size makes swap feature very important on low-memory platfor those are actually non-operable without it. Signed-off-by: Yuri Tikhonov Signed-off-by: Kumar Gala

[PPC] Remove 85xx from arch/ppc

2008-01-28T14:33:10Z

85xx exists in arch/powerpc as well as cuImage support to boot from a u-boot that doesn't support device trees. Signed-off-by: Kumar Gala

[POWERPC] Remove APUS support from arch/ppc

2007-09-17T05:15:04Z

Current status of APUS: - arch/powerpc/: removed in 2.6.23 - arch/ppc/: marked BROKEN since 2 years This therefore removes the remaining parts of APUS support from arch/ppc, include/asm-ppc, arch/powerpc and include/asm-powerpc. Signed-off-by: Adrian Bunk Signed-off-by: Paul Mackerras

mm: remove ptep_test_and_clear_dirty and ptep_clear_flush_dirty

2007-07-17T17:22:59Z

Nobody is using ptep_test_and_clear_dirty and ptep_clear_flush_dirty. Remove the functions from all architectures. Signed-off-by: Martin Schwidefsky Cc: Hugh Dickins Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

page table handling cleanup

2007-07-16T16:05:36Z

Kill pte_rdprotect(), pte_exprotect(), pte_mkread(), pte_mkexec(), pte_read(), pte_exec(), and pte_user() except where arch-specific code is making use of them. Signed-off-by: Jan Beulich Cc: Andi Kleen Cc: Christoph Hellwig Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

Rework ptep_set_access_flags and fix sun4c

2007-06-16T20:16:16Z

Some changes done a while ago to avoid pounding on ptep_set_access_flags and update_mmu_cache in some race situations break sun4c which requires update_mmu_cache() to always be called on minor faults. This patch reworks ptep_set_access_flags() semantics, implementations and callers so that it's now responsible for returning whether an update is necessary or not (basically whether the PTE actually changed). This allow fixing the sparc implementation to always return 1 on sun4c. [akpm@linux-foundation.org: fixes, cleanups] Signed-off-by: Benjamin Herrenschmidt Cc: Hugh Dickins Cc: David Miller Cc: Mark Fortescue Acked-by: William Lee Irwin III Cc: "Luck, Tony" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

Clean up mostly unused IOSPACE macros

2007-05-08T18:15:13Z

Most architectures defined three macros, MK_IOSPACE_PFN(), GET_IOSPACE() and GET_PFN() in pgtable.h. However, the only callers of any of these macros are in Sparc specific code, either in arch/sparc, arch/sparc64 or drivers/sbus. This patch removes the redundant macros from all architectures except sparc and sparc64. Signed-off-by: David Gibson Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[PATCH] Standardize pxx_page macros

2006-09-26T15:48:51Z

One of the changes necessary for shared page tables is to standardize the pxx_page macros. pte_page and pmd_page have always returned the struct page associated with their entry, while pte_page_kernel and pmd_page_kernel have returned the kernel virtual address. pud_page and pgd_page, on the other hand, return the kernel virtual address. Shared page tables needs pud_page and pgd_page to return the actual page structures. There are very few actual users of these functions, so it is simple to standardize their usage. Since this is basic cleanup, I am submitting these changes as a standalone patch. Per Hugh Dickins' comments about it, I am also changing the pxx_page_kernel macros to pxx_page_vaddr to clarify their meaning. Signed-off-by: Dave McCracken Cc: Hugh Dickins Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds