Re: [GIT PULL] x86/microcode for v3.9-rc1

From: Borislav Petkov
Date: Thu Feb 28 2013 - 18:16:23 EST

On Thu, Feb 21, 2013 at 08:56:36PM -0800, H. Peter Anvin wrote:
> Hi Linus,
> This patchset lets us update the CPU microcode very, very early in
> initialization if the BIOS fails to do so (never happens, right?)
> This is handy for dealing with things like the Atom erratum where we
> have to run without PSE because microcode loading happens too late.
> As I mentioned in the x86/mm push request it depends on that
> infrastructure but it is otherwise a standalone feature.
> ----------------------------------------------------------------
> The following changes since commit ac2cbab21f318e19bc176a7f38a120cec835220f:
> x86: Don't panic if can not alloc buffer for swiotlb (2013-01-29 19:36:53 -0800)
> are available in the git repository at:
> git:// x86/microcode
> for you to fetch changes up to da76f64e7eb28b718501d15c1b79af560b7ca4ea:
> x86/Kconfig: Make early microcode loading a configuration feature (2013-01-31 13:20:42 -0800)
> ----------------------------------------------------------------
> Fenghua Yu (12):
> x86, doc: Documentation for early microcode loading
> x86/microcode_intel.h: Define functions and macros for early loading ucode
> x86/common.c: Make have_cpuid_p() a global function
> x86/common.c: load ucode in 64 bit or show loading ucode info in 32 bit on AP
> x86/microcode_core_early.c: Define interfaces for early loading ucode
> x86/microcode_intel_lib.c: Early update ucode on Intel's CPU
> x86/tlbflush.h: Define __native_flush_tlb_global_irq_disabled()
> x86/microcode_intel_early.c: Early update ucode on Intel's CPU
> x86/head_32.S: Early update ucode in 32-bit
> x86/head64.c: Early update ucode in 64-bit
> x86/mm/init.c: Copy ucode from initrd image to kernel memory
> x86/Kconfig: Make early microcode loading a configuration feature

Some strange build warnings I get here:

arch/x86/kernel/microcode_intel_early.c: In function `get_matching_model_microcode.isra.3.constprop.9':
arch/x86/kernel/microcode_intel_early.c:366:1: warning: the frame size of 1072 bytes is larger than 1024 bytes [-Wframe-larger-than=]
arch/x86/kernel/microcode_intel_early.c: In function `save_mc_for_early':
arch/x86/kernel/microcode_intel_early.c:550:1: warning: the frame size of 1040 bytes is larger than 1024 bytes [-Wframe-larger-than=]

What's up?


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