linux-kernel - Re: [tip:x86/microcode] x86, microcode, amd: Fix warnings and errors on with CONFIG

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Date:	Tue, 4 Jun 2013 16:36:00 -0500
From:	Jacob Shin <jacob.shin@....com>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	Ingo Molnar <mingo@...nel.org>, "H. Peter Anvin" <hpa@...or.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Borislav Petkov <bp@...en8.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	"linux-tip-commits@...r.kernel.org" 
	<linux-tip-commits@...r.kernel.org>
Subject: Re: [tip:x86/microcode] x86, microcode, amd: Fix warnings and errors
 on with CONFIG_MICROCODE=m

On Tue, Jun 04, 2013 at 02:02:43PM -0700, Yinghai Lu wrote:
> On Fri, May 31, 2013 at 2:59 PM, tip-bot for Jacob Shin
> <tipbot@...or.com> wrote:
> > Commit-ID:  6b3389ac21b5e557b957f1497d0ff22bf733e8c3
> > Gitweb:     http://git.kernel.org/tip/6b3389ac21b5e557b957f1497d0ff22bf733e8c3
> > Author:     Jacob Shin <jacob.shin@....com>
> > AuthorDate: Fri, 31 May 2013 01:53:24 -0500
> > Committer:  H. Peter Anvin <hpa@...ux.intel.com>
> > CommitDate: Fri, 31 May 2013 13:56:58 -0700
> >
> > x86, microcode, amd: Fix warnings and errors on with CONFIG_MICROCODE=m
> >
> > Fix section mismatch warnings on microcode_amd_early.
> > Compile error occurs when CONFIG_MICROCODE=m, change so that early
> > loading depends on microcode_core.
> >
> > Reported-by: Yinghai Lu <yinghai@...nel.org>
> > Reported-by: Borislav Petkov <bp@...en8.de>
> > Signed-off-by: Jacob Shin <jacob.shin@....com>
> > Link: http://lkml.kernel.org/r/20130531150241.GA12006@jshin-Toonie
> > Signed-off-by: H. Peter Anvin <hpa@...ux.intel.com>
> > ---
> >  arch/x86/Kconfig                      | 2 +-
> >  arch/x86/include/asm/microcode_amd.h  | 2 +-
> >  arch/x86/kernel/microcode_amd_early.c | 8 ++++----
> >  3 files changed, 6 insertions(+), 6 deletions(-)
> >
> > diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> > index 28dba52..2705532 100644
> > --- a/arch/x86/Kconfig
> > +++ b/arch/x86/Kconfig
> > @@ -1065,7 +1065,7 @@ config MICROCODE_AMD_EARLY
> >
> >  config MICROCODE_EARLY
> >         bool "Early load microcode"
> > -       depends on (MICROCODE_INTEL || MICROCODE_AMD) && BLK_DEV_INITRD
> > +       depends on MICROCODE=y && BLK_DEV_INITRD
> >         select MICROCODE_INTEL_EARLY if MICROCODE_INTEL
> >         select MICROCODE_AMD_EARLY if MICROCODE_AMD
> >         default y
> > diff --git a/arch/x86/include/asm/microcode_amd.h b/arch/x86/include/asm/microcode_amd.h
> > index 24254aa..c6b043f 100644
> > --- a/arch/x86/include/asm/microcode_amd.h
> > +++ b/arch/x86/include/asm/microcode_amd.h
> > @@ -64,7 +64,7 @@ extern enum ucode_state load_microcode_amd(int cpu, const u8 *data, size_t size)
> >  #ifdef CONFIG_MICROCODE_AMD_EARLY
> >  #ifdef CONFIG_X86_32
> >  #define MPB_MAX_SIZE PAGE_SIZE
> > -extern u8 __cpuinitdata amd_bsp_mpb[MPB_MAX_SIZE];
> > +extern u8 amd_bsp_mpb[MPB_MAX_SIZE];
> >  #endif
> >  extern void __init load_ucode_amd_bsp(void);
> >  extern void __cpuinit load_ucode_amd_ap(void);
> > diff --git a/arch/x86/kernel/microcode_amd_early.c b/arch/x86/kernel/microcode_amd_early.c
> > index 7e54d97..9618805 100644
> > --- a/arch/x86/kernel/microcode_amd_early.c
> > +++ b/arch/x86/kernel/microcode_amd_early.c
> > @@ -21,9 +21,9 @@ static u32 ucode_new_rev;
> >   * Microcode patch container file is prepended to the initrd in cpio format.
> >   * See Documentation/x86/early-microcode.txt
> >   */
> > -static __initdata char ucode_path[] = "kernel/x86/microcode/AuthenticAMD.bin";
> > +static __cpuinitdata char ucode_path[] = "kernel/x86/microcode/AuthenticAMD.bin";
> >
> > -static struct cpio_data __init find_ucode_in_initrd(void)
> > +static struct cpio_data __cpuinit find_ucode_in_initrd(void)
> >  {
> >         long offset = 0;
> >         struct cpio_data cd;
> 
> does not like right fix.
> 
> find_ucode_in_initrd should be __init.
> 
> > @@ -62,7 +62,7 @@ static struct cpio_data __init find_ucode_in_initrd(void)
> >   * load_microcode_amd() to save equivalent cpu table and microcode patches in
> >   * kernel heap memory.
> >   */
> > -static void __init apply_ucode_in_initrd(void)
> > +static void __cpuinit apply_ucode_in_initrd(void)
> >  {
> >         struct cpio_data cd;
> >         struct equiv_cpu_entry *eq;
> 
> it should not call find_ucode_in_initrd or
> it should be __init.

It's because the load_ucode_amd_ap() (which is __cpuinit because it
can be called during CPU hotplug on).

Hm.. but yes, I do agree with you, I'm waiting for feedback on this
follow up patch to allow multiple concatanated microcode files:

  https://lkml.org/lkml/2013/5/31/664

I'll submit multi-patch patchset to address your feedback as well.

Thank you,

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