summaryrefslogtreecommitdiff
path: root/arch/x86/include/asm/pgtable.h
diff options
context:
space:
mode:
authorCyrill Gorcunov <gorcunov@openvz.org>2014-06-04 16:08:16 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-06-04 16:54:05 -0700
commit2bf01f9f0cf07b231c90e5d56266e84fe17cec79 (patch)
tree17b0a78d5270dc6d341dace4c2a0b80051a4f003 /arch/x86/include/asm/pgtable.h
parent2373eaecff33db5972bde9418f92d6401b4a945c (diff)
mm: x86 pgtable: require X86_64 for soft-dirty tracker
Tracking dirty status on 2 level pages requires very ugly macros and taking into account how old the machines who can operate without PAE mode only are, lets drop soft dirty tracker from them for code simplicity (note I can't drop all the macros from 2 level pages by now since _PAGE_BIT_PROTNONE and _PAGE_BIT_FILE are still used even without tracker). Linus proposed to completely rip off softdirty support on x86-32 (even with PAE) and since for CRIU we're not planning to support native x86-32 mode, lets do that. (Softdirty tracker is relatively new feature which is mostly used by CRIU so I don't expect if such API change would cause problems for userspace). Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mel Gorman <mgorman@suse.de> Cc: Peter Anvin <hpa@zytor.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Steven Noonan <steven@uplinklabs.net> Cc: Rik van Riel <riel@redhat.com> Cc: David Vrabel <david.vrabel@citrix.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Pavel Emelyanov <xemul@parallels.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/x86/include/asm/pgtable.h')
-rw-r--r--arch/x86/include/asm/pgtable.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index 66276c1d23bb..0ec056012618 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -297,6 +297,7 @@ static inline pmd_t pmd_mknotpresent(pmd_t pmd)
return pmd_clear_flags(pmd, _PAGE_PRESENT);
}
+#ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
static inline int pte_soft_dirty(pte_t pte)
{
return pte_flags(pte) & _PAGE_SOFT_DIRTY;
@@ -332,6 +333,8 @@ static inline int pte_file_soft_dirty(pte_t pte)
return pte_flags(pte) & _PAGE_SOFT_DIRTY;
}
+#endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */
+
/*
* Mask out unsupported bits in a present pgprot. Non-present pgprots
* can use those bits for other purposes, so leave them be.
@@ -865,6 +868,7 @@ static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
{
}
+#ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
static inline pte_t pte_swp_mksoft_dirty(pte_t pte)
{
VM_BUG_ON(pte_present_nonuma(pte));
@@ -882,6 +886,7 @@ static inline pte_t pte_swp_clear_soft_dirty(pte_t pte)
VM_BUG_ON(pte_present_nonuma(pte));
return pte_clear_flags(pte, _PAGE_SWP_SOFT_DIRTY);
}
+#endif
#include <asm-generic/pgtable.h>
#endif /* __ASSEMBLY__ */