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    [PATCH] mm: arch do_page_fault() vs in_atomic() · 6edaf68a
    Peter Zijlstra 提交于
    In light of the recent pagefault and filemap_copy_from_user work I've gone
    through all the arch pagefault handlers to make sure the inc_preempt_count()
    'feature' works as expected.
    
    Several sections of code (including the new filemap_copy_from_user) rely on
    the fact that faults do not take locks under increased preempt count.
    
    arch/x86_64 - good
    arch/powerpc - good
    arch/cris - fixed
    arch/i386 - good
    arch/parisc - fixed
    arch/sh - good
    arch/sparc - good
    arch/s390 - good
    arch/m68k - fixed
    arch/ppc - good
    arch/alpha - fixed
    arch/mips - good
    arch/sparc64 - good
    arch/ia64 - good
    arch/arm - fixed
    arch/um - good
    arch/avr32 - good
    arch/h8300 - NA
    arch/m32r - good
    arch/v850 - good
    arch/frv - fixed
    arch/m68knommu - NA
    arch/arm26 - fixed
    arch/sh64 - fixed
    arch/xtensa - good
    Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl>
    Acked-by: NNick Piggin <npiggin@suse.de>
    Signed-off-by: NAndrew Morton <akpm@osdl.org>
    Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
    6edaf68a
fault.c 5.1 KB