• Benjamin Herrenschmidt's avatar
    mm: Pass virtual address to [__]p{te,ud,md}_free_tlb() · 9e1b32ca
    Benjamin Herrenschmidt authored
    mm: Pass virtual address to [__]p{te,ud,md}_free_tlb()
    
    Upcoming paches to support the new 64-bit "BookE" powerpc architecture
    will need to have the virtual address corresponding to PTE page when
    freeing it, due to the way the HW table walker works.
    
    Basically, the TLB can be loaded with "large" pages that cover the whole
    virtual space (well, sort-of, half of it actually) represented by a PTE
    page, and which contain an "indirect" bit indicating that this TLB entry
    RPN points to an array of PTEs from which the TLB can then create direct
    entries. Thus, in order to invalidate those when PTE pages are deleted,
    we need the virtual address to pass to tlbilx or tlbivax instructions.
    
    The old trick of sticking it somewhere in the PTE page struct page sucks
    too much, the address is almost readily available in all call sites and
    almost everybody implemets these as macros, so we may as well add the
    argument everywhere. I added it to the pmd and pud variants for consistency.
    Signed-off-by: 's avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
    Acked-by: David Howells <dhowells@redhat.com> [MN10300 & FRV]
    Acked-by: 's avatarNick Piggin <npiggin@suse.de>
    Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com> [s390]
    Signed-off-by: 's avatarLinus Torvalds <torvalds@linux-foundation.org>
    9e1b32ca
pgtable-nopud.h 1.78 KB