From: Jeremy Fitzhardinge Date: Thu, 29 Nov 2007 00:22:11 +0000 (-0800) Subject: x86/paravirt: revert exports to restore old behaviour X-Git-Tag: v2.6.24-rc4~23 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f97b8954953ba8e692dbb92d99e26b721f7068cd;p=linux-2.6 x86/paravirt: revert exports to restore old behaviour Subdividing the paravirt_ops structure caused a regression in certain non-GPL modules which try to use mmu_ops and cpu_ops. This restores the old behaviour, and makes it consistent with the non-CONFIG_PARAVIRT case. Takashi Iwai adds: > I took at this problem (as I have an nvidia card on one of my > workstations), and found out that the following suffer from > EXPORT_SYMBOL_GPL changes: > > * local_disable_irq(), local_irq_save*(), etc. > * MSR-related macros like rdmsr(), wrmsr(), read_cr0(), etc. > wbinvd(), too. > * pmd_val(), pgd_val(), etc are all involved with pv_mm_ops. > pmd_large() and pmd_bad() is also indirectly involved. > __flush_tlb() and friends suffer, too. Christoph Hellwig objects to this patch on the grounds that modules shouldn't be using these operations anyway. I don't think this is a particularly good reason to reject the patch, for several reasons: 1. These operations are still available to modules when not using CONFIG_PARAVIRT, since they are implicitly exported as inline functions via the kernel headers. Exporting the same functionality as GPL-only symbols just adds a gratuitious difference between CONFIG_PARAVIRT and non-CONFIG_PARAVIRT configurations. If we really think these operations are not for module use (or non-GPL module use), then we should solve the problem in a general way. 2. It's a regression from previous kernels, which would work these modules even with CONFIG_PARAVIRT enabled. 3. The operations in question seem pretty reasonable for modules to use. The control registers/MSRs can be accessed directly anyway, so there's no benefit in preventing modules from using standard interfaces. And it seems reasonable to allow a graphics driver to create its own mappings if it wants. Therefore, I think this patch should go in for 2.6.24. If people really think that these operations should not be available to modules, then we can address that separately. Signed-off-by: Jeremy Fitzhardinge Cc: Tobias Powalowski Cc: Christoph Hellwig Cc: Takashi Iwai Cc: Zachary Amsden Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/arch/x86/kernel/paravirt_32.c b/arch/x86/kernel/paravirt_32.c index 6a80d67c21..f5000799f8 100644 --- a/arch/x86/kernel/paravirt_32.c +++ b/arch/x86/kernel/paravirt_32.c @@ -465,8 +465,8 @@ struct pv_mmu_ops pv_mmu_ops = { }; EXPORT_SYMBOL_GPL(pv_time_ops); -EXPORT_SYMBOL_GPL(pv_cpu_ops); -EXPORT_SYMBOL_GPL(pv_mmu_ops); +EXPORT_SYMBOL (pv_cpu_ops); +EXPORT_SYMBOL (pv_mmu_ops); EXPORT_SYMBOL_GPL(pv_apic_ops); EXPORT_SYMBOL_GPL(pv_info); EXPORT_SYMBOL (pv_irq_ops);