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| author | Arjun Roy <arjunroy@google.com> | 2020-04-11 00:32:58 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-04-11 01:36:21 +0300 |
| commit | c97078bd219cbe1a878b24bb4e61d312f19ece1f (patch) | |
| tree | 875ea9eaf77017c75311a2e52a89a18ed9706b02 /arch/x86 | |
| parent | 251a0ffeaeee2a900765d98d44880943dce1047d (diff) | |
| download | linux-c97078bd219cbe1a878b24bb4e61d312f19ece1f.tar.xz | |
mm: define pte_index as macro for x86
pte_index() is either defined as a macro (e.g. sparc64) or as an
inlined function (e.g. x86). vm_insert_pages() depends on pte_index
but it is not defined on all platforms (e.g. m68k).
To fix compilation of vm_insert_pages() on architectures not providing
pte_index(), we perform the following fix:
0. For platforms where it is meaningful, and defined as a macro, no
change is needed.
1. For platforms where it is meaningful and defined as an inlined
function, and we want to use it with vm_insert_pages(), we define
a degenerate macro of the form: #define pte_index pte_index
2. vm_insert_pages() checks for the existence of a pte_index macro
definition. If found, it implements a batched insert. If not found,
it devolves to calling vm_insert_page() in a loop.
This patch implements step 1 for x86.
v3 of this patch fixes a compilation warning for an unused method.
v2 of this patch moved a macro definition to a more readable location.
Signed-off-by: Arjun Roy <arjunroy@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: David Miller <davem@davemloft.net>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Soheil Hassas Yeganeh <soheil@google.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Link: http://lkml.kernel.org/r/20200228054714.204424-1-arjunroy.kdev@gmail.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/include/asm/pgtable.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h index 28838d790191..abad0da0973a 100644 --- a/arch/x86/include/asm/pgtable.h +++ b/arch/x86/include/asm/pgtable.h @@ -860,7 +860,10 @@ static inline unsigned long pmd_index(unsigned long address) * * this function returns the index of the entry in the pte page which would * control the given virtual address + * + * Also define macro so we can test if pte_index is defined for arch. */ +#define pte_index pte_index static inline unsigned long pte_index(unsigned long address) { return (address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1); |