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    SubjectRe: [PATCH] x86: export 'pcibios_enabled'
    On Thu, Mar 22, 2012 at 08:41:35AM +0800, Wang YanQing wrote:
    > On Wed, Mar 14, 2012 at 11:21:37AM +0000, Alan Cox wrote:
    > > You can use set_memory_x() to mark memory executable (and _nx to set it back).
    > >
    > NO I can't, if I set_memory_x and don't set pcibios_enabled = 1, then
    > static_protections will still failed because pcibios_enabled == 0,
    > and I don't want to use set_memory_x, because I don't want to give the user
    > of uvesafb that feeling "I will lost BIOS NX protection if I choice uvesafb."
    >
    > > If you really need to know if NX is being used then the check
    > >
    > > if (__supported_pte_mask & PTE_NX)
    > >
    > > will do the trick and the variable is exported.
    > I don't understand what do you mean, do you means CONFIG_X86_PAE for 32? Or CONFIG_X86_64?
    > when NX is being used, the pci bios is NX or not also depend on
    > ACPI.ACPI on or off all will influnce the code path in pci_arch_init,
    > decide the set_bios_x have chance to execute or not.See
    > https://lkml.org/lkml/2011/11/16/84
    >
    > By the way _PAGE_NX instead of PTE_NX, right?
    >
    > > I'd suggest however you wrap that in a cpu_has_nx() type macro somewhere
    > > in the arch headers.
    > >
    > The same above.
    >
    > > If you go poking around pcibios values you are going to get burned if
    > > someone is ever bored enough to make NX and PCIBIOS work together
    > > differently.
    > >
    > Indeed according to 5bd5a452662bc37c54fb6828db1a3faf87e6511c, who bring me
    > the trouble, check the pcibios_enabled is the only simple and good way to
    > resolve the Oops I meet.
    >
    > If you really don't want it, and if I am not all wrong about your "helper method",
    > you means you want export the below:
    > int check_pcibios_enabled()?
    > See https://lkml.org/lkml/2012/2/26/124
    >
    > Thanks.
    >
    Sorry for the delay reply and cross email threads, Alan Cox.
    But I still can't find a better way then to check the pcibios_enabled variable,
    any better suggestion?


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