linux-kernel - Re: [PATCH] powerpc/radix: Move some functions into #ifdef CONFIG_KVM_BOOK3S_HV

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Date:   Mon, 14 Aug 2023 16:24:15 +1000
From:   "Nicholas Piggin" <npiggin@...il.com>
To:     "Christophe Leroy" <christophe.leroy@...roup.eu>,
        "Michael Ellerman" <mpe@...erman.id.au>
Cc:     <linux-kernel@...r.kernel.org>, <linuxppc-dev@...ts.ozlabs.org>,
        "kernel test robot" <lkp@...el.com>
Subject: Re: [PATCH] powerpc/radix: Move some functions into #ifdef
 CONFIG_KVM_BOOK3S_HV_POSSIBLE

On Wed Aug 9, 2023 at 6:01 PM AEST, Christophe Leroy wrote:
> With skiboot_defconfig, Clang reports:
>
>   CC      arch/powerpc/mm/book3s64/radix_tlb.o
> arch/powerpc/mm/book3s64/radix_tlb.c:419:20: error: unused function '_tlbie_pid_lpid' [-Werror,-Wunused-function]
> static inline void _tlbie_pid_lpid(unsigned long pid, unsigned long lpid,
>                    ^
> arch/powerpc/mm/book3s64/radix_tlb.c:663:20: error: unused function '_tlbie_va_range_lpid' [-Werror,-Wunused-function]
> static inline void _tlbie_va_range_lpid(unsigned long start, unsigned long end,
>                    ^
>
> This is because those functions are only called from functions
> enclosed in a #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
>
> Move below functions inside that #ifdef
> * __tlbie_pid_lpid(unsigned long pid,
> * __tlbie_va_lpid(unsigned long va, unsigned long pid,
> * fixup_tlbie_pid_lpid(unsigned long pid, unsigned long lpid)
> * _tlbie_pid_lpid(unsigned long pid, unsigned long lpid,
> * fixup_tlbie_va_range_lpid(unsigned long va,
> * __tlbie_va_range_lpid(unsigned long start, unsigned long end,
> * _tlbie_va_range_lpid(unsigned long start, unsigned long end,

Thanks for doing this. Functions vaguely belong where they are, which
makes it slightly annoying to move them. Is it also annoying to add
ifdefs for each one where they are?

Thanks,
Nick