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| author | Borislav Petkov <bp@amd64.org> | 2010-03-12 15:43:03 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2010-03-13 08:36:16 +0100 |
| commit | 0e152cd7c16832bd5cadee0c2e41d9959bc9b6f9 (patch) | |
| tree | c84df0d86adf5347268939be88426394cd28e18e /arch/x86/kernel/pci-gart_64.c | |
| parent | x86, UV: Fix target_cpus() in x2apic_uv_x.c (diff) | |
| download | linux-0e152cd7c16832bd5cadee0c2e41d9959bc9b6f9.tar.xz linux-0e152cd7c16832bd5cadee0c2e41d9959bc9b6f9.zip | |
x86, k8 nb: Fix boot crash: enable k8_northbridges unconditionally on AMD systems
de957628ce7c84764ff41331111036b3ae5bad0f changed setting of the
x86_init.iommu.iommu_init function ptr only when GART IOMMU is
found.
One side effect of it is that num_k8_northbridges
is not initialized anymore if not explicitly
called. This resulted in uninitialized pointers in
<arch/x86/kernel/cpu/intel_cacheinfo.c:amd_calc_l3_indices()>,
for example, which uses the num_k8_northbridges thing through
node_to_k8_nb_misc().
Fix that through an initcall that runs right after the PCI
subsystem and does all the scanning. Then, remove initialization
in gart_iommu_init() which is a rootfs_initcall and we're
running before that.
What is more, since num_k8_northbridges is being used in other
places beside GART IOMMU, include it whenever we add AMD CPU
support. The previous dependency chain in kconfig contained
K8_NB depends on AGP_AMD64|GART_IOMMU
which was clearly incorrect. The more natural way in terms of
hardware dependency should be
AGP_AMD64|GART_IOMMU depends on K8_NB depends on CPU_SUP_AMD &&
PCI. Make it so Number One!
Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>
Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Cc: Joerg Roedel <joerg.roedel@amd.com>
LKML-Reference: <20100312144303.GA29262@aftab>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Tested-by: Joerg Roedel <joerg.roedel@amd.com>
Diffstat (limited to 'arch/x86/kernel/pci-gart_64.c')
| -rw-r--r-- | arch/x86/kernel/pci-gart_64.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kernel/pci-gart_64.c b/arch/x86/kernel/pci-gart_64.c index 34de53b46f87..f3af115a573a 100644 --- a/arch/x86/kernel/pci-gart_64.c +++ b/arch/x86/kernel/pci-gart_64.c @@ -735,7 +735,7 @@ int __init gart_iommu_init(void) unsigned long scratch; long i; - if (cache_k8_northbridges() < 0 || num_k8_northbridges == 0) + if (num_k8_northbridges == 0) return 0; #ifndef CONFIG_AGP_AMD64 |