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SubjectRe: [PATCH] powerpc/ptdump: don't entirely rebuild kernel when selecting CONFIG_PPC_DEBUG_WX
Date
Christophe Leroy <christophe.leroy@c-s.fr> writes:
> Selecting CONFIG_PPC_DEBUG_WX only impacts ptdump and pgtable_32/64
> init calls. Declaring related functions in asm/pgtable.h implies
> rebuilding almost everything.
>
> Move ptdump_check_wx() declaration in a new dedicated header file.

Can you put it in arch/powerpc/mm/mmu_decl.h ? That already exists for
things that are private to arch/powerpc/mm, which this function is
AFAICT.

cheers

> arch/powerpc/include/asm/pgtable.h | 6 ------
> arch/powerpc/include/asm/ptdump.h | 15 +++++++++++++++
> arch/powerpc/mm/pgtable_32.c | 1 +
> arch/powerpc/mm/pgtable_64.c | 1 +
> arch/powerpc/mm/ptdump/ptdump.c | 1 +
> 5 files changed, 18 insertions(+), 6 deletions(-)
> create mode 100644 arch/powerpc/include/asm/ptdump.h
>
> diff --git a/arch/powerpc/include/asm/pgtable.h b/arch/powerpc/include/asm/pgtable.h
> index 0e4ec8cc37b7..8cc543ed114c 100644
> --- a/arch/powerpc/include/asm/pgtable.h
> +++ b/arch/powerpc/include/asm/pgtable.h
> @@ -94,12 +94,6 @@ void mark_initmem_nx(void);
> static inline void mark_initmem_nx(void) { }
> #endif
>
> -#ifdef CONFIG_PPC_DEBUG_WX
> -void ptdump_check_wx(void);
> -#else
> -static inline void ptdump_check_wx(void) { }
> -#endif
> -
> /*
> * When used, PTE_FRAG_NR is defined in subarch pgtable.h
> * so we are sure it is included when arriving here.
> diff --git a/arch/powerpc/include/asm/ptdump.h b/arch/powerpc/include/asm/ptdump.h
> new file mode 100644
> index 000000000000..246b92c21729
> --- /dev/null
> +++ b/arch/powerpc/include/asm/ptdump.h
> @@ -0,0 +1,15 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef _ASM_POWERPC_PTDUMP_H
> +#define _ASM_POWERPC_PTDUMP_H
> +
> +#ifndef __ASSEMBLY__
> +
> +#ifdef CONFIG_PPC_DEBUG_WX
> +void ptdump_check_wx(void);
> +#else
> +static inline void ptdump_check_wx(void) { }
> +#endif
> +
> +#endif /* __ASSEMBLY__ */
> +
> +#endif /* _ASM_POWERPC_PTDUMP_H */
> diff --git a/arch/powerpc/mm/pgtable_32.c b/arch/powerpc/mm/pgtable_32.c
> index 73b84166d06a..6c866f1b1eeb 100644
> --- a/arch/powerpc/mm/pgtable_32.c
> +++ b/arch/powerpc/mm/pgtable_32.c
> @@ -29,6 +29,7 @@
> #include <asm/fixmap.h>
> #include <asm/setup.h>
> #include <asm/sections.h>
> +#include <asm/ptdump.h>
>
> #include <mm/mmu_decl.h>
>
> diff --git a/arch/powerpc/mm/pgtable_64.c b/arch/powerpc/mm/pgtable_64.c
> index e78832dce7bb..3686cd887c2f 100644
> --- a/arch/powerpc/mm/pgtable_64.c
> +++ b/arch/powerpc/mm/pgtable_64.c
> @@ -45,6 +45,7 @@
> #include <asm/sections.h>
> #include <asm/firmware.h>
> #include <asm/dma.h>
> +#include <asm/ptdump.h>
>
> #include <mm/mmu_decl.h>
>
> diff --git a/arch/powerpc/mm/ptdump/ptdump.c b/arch/powerpc/mm/ptdump/ptdump.c
> index 2f9ddc29c535..d7b02bcd0691 100644
> --- a/arch/powerpc/mm/ptdump/ptdump.c
> +++ b/arch/powerpc/mm/ptdump/ptdump.c
> @@ -23,6 +23,7 @@
> #include <linux/const.h>
> #include <asm/page.h>
> #include <asm/pgalloc.h>
> +#include <asm/ptdump.h>
>
> #include "ptdump.h"
>
> --
> 2.13.3

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