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SubjectRe: [PATCH] x86/microcode: Do not select FW_LOADER
On Wed, Jun 10, 2020 at 02:29:11PM +1000, Herbert Xu wrote:
> The x86 microcode support works just fine without FW_LOADER. In
> fact these days most people load them early in boot so FW_LOADER
> never gets into the picture anyway.

What's the use case here?

$ git grep -E "select.*FW_LOADER" | wc -l
132

so this thing gets selected anyway, practically.

Also, I'm working on removing that homegrown get_builtin_firmware() and
use the one in the fw loader:

https://lkml.kernel.org/r/20200408094526.GC24663@zn.tnic

Leaving in the rest for reference.

> People who need the FW_LOADER capability can still enable it.
>
> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
>
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index 1d6104ea8af0..8aac7a65bfbb 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -1296,7 +1296,6 @@ config MICROCODE
> bool "CPU microcode loading support"
> default y
> depends on CPU_SUP_AMD || CPU_SUP_INTEL
> - select FW_LOADER
> ---help---
> If you say Y here, you will be able to update the microcode on
> Intel and AMD processors. The Intel support is for the IA32 family,
> @@ -1318,7 +1317,6 @@ config MICROCODE_INTEL
> bool "Intel microcode loading support"
> depends on MICROCODE
> default MICROCODE
> - select FW_LOADER
> ---help---
> This options enables microcode patch loading support for Intel
> processors.
> @@ -1330,7 +1328,6 @@ config MICROCODE_INTEL
> config MICROCODE_AMD
> bool "AMD microcode loading support"
> depends on MICROCODE
> - select FW_LOADER
> ---help---
> If you select this option, microcode patch loading support for AMD
> processors will be enabled.
> diff --git a/arch/x86/kernel/cpu/microcode/core.c b/arch/x86/kernel/cpu/microcode/core.c
> index 7019d4b2df0c..5524ea15b3df 100644
> --- a/arch/x86/kernel/cpu/microcode/core.c
> +++ b/arch/x86/kernel/cpu/microcode/core.c
> @@ -145,7 +145,6 @@ extern struct builtin_fw __end_builtin_fw[];
>
> bool get_builtin_firmware(struct cpio_data *cd, const char *name)
> {
> -#ifdef CONFIG_FW_LOADER
> struct builtin_fw *b_fw;
>
> for (b_fw = __start_builtin_fw; b_fw != __end_builtin_fw; b_fw++) {
> @@ -155,7 +154,6 @@ bool get_builtin_firmware(struct cpio_data *cd, const char *name)
> return true;
> }
> }
> -#endif
> return false;
> }
>
> --
> Email: Herbert Xu <herbert@gondor.apana.org.au>
> Home Page: http://gondor.apana.org.au/~herbert/
> PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt

--
Regards/Gruss,
Boris.

https://people.kernel.org/tglx/notes-about-netiquette

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