path: root/scripts/Makefile.lib
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authorHugh Dickins <hugh@veritas.com>2009-03-23 01:41:27 +0000
committerGreg Kroah-Hartman <gregkh@suse.de>2009-03-24 16:38:26 -0700
commit095160aee954688a9bad225952c4bee546541e19 (patch)
tree5f2ceb17b0a414da00b7173384efda8c56c1755c /scripts/Makefile.lib
parentf520360d93cdc37de5d972dac4bf3bdef6a7f6a7 (diff)
sysfs: fix some bin_vm_ops errors
Commit 86c9508eb1c0ce5aa07b5cf1d36b60c54efc3d7a "sysfs: don't block indefinitely for unmapped files" in linux-next crashes the PowerMac G5 when X starts up. It's caught out by the way powerpc's pci_mmap of legacy_mem uses shmem_zero_setup(), substituting a new vma->vm_file whose private_data no longer points to the bin_buffer (substitution done because some versions of X crash if that mmap fails). The fix to this is straightforward: the original vm_file is fput() in that case, so this mmap won't block sysfs at all, so just don't switch over to bin_vm_ops if vm_file has changed. But more fixes made before realizing that was the problem:- It should not be an error if bin_page_mkwrite() finds no underlying page_mkwrite(). Check that a file already mmap'ed has the same underlying vm_ops _before_ pointing vma->vm_ops at bin_vm_ops. If the file being mmap'ed is a shmem/tmpfs file, don't fail the mmap on CONFIG_NUMA=y, just because that has a set_policy and get_policy: provide bin_set_policy, bin_get_policy and bin_migrate. Signed-off-by: Hugh Dickins <hugh@veritas.com> Acked-by: Eric Biederman <ebiederm@aristanetworks.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'scripts/Makefile.lib')
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