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powerpc: Add kconfig option for the systemcfg page

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The systemcfg page through procfs is only a backwards-compatible
interface for very old applications.
Make it possible to be disabled.

This also creates a convenient config #define to guard any accesses to
the systemcfg page.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/20241010-vdso-generic-base-v1-25-b64f0842d512@linutronix.de
This commit is contained in:
Thomas Weißschuh
2024-10-10 09:01:27 +02:00
committed by Thomas Gleixner
parent e07359f171
commit c22c06b4cc
2 changed files with 10 additions and 2 deletions
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8
arch/powerpc/Kconfig
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@@ -1298,6 +1298,14 @@ config MODULES_SIZE
endmenu
config PPC64_PROC_SYSTEMCFG
def_bool y
depends on PPC64 && PROC_FS
help
This option enables the presence of /proc/ppc64/systemcfg through
which the systemcfg page can be accessed.
This interface only exists for backwards-compatibility.
if PPC64
# This value must have zeroes in the bottom 60 bits otherwise lots will break
config PAGE_OFFSET