[PATCH 25/28] powerpc: Add kconfig option for the systemcfg page
From: Thomas Weißschuh <hidden>
Date: 2024-10-10 07:02:20
Also in:
linux-arm-kernel, linux-mips, linux-riscv, linux-s390, lkml, loongarch
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Michael Ellerman, Linus Torvalds
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 <redacted> --- arch/powerpc/Kconfig | 8 ++++++++ arch/powerpc/kernel/proc_powerpc.c | 4 ++-- 2 files changed, 10 insertions(+), 2 deletions(-)
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 8094a01974cca1d27002720e706f66bec2a2d035..5d348e1f09d730002eee9894a0b2847e1dac15d5 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig@@ -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
diff --git a/arch/powerpc/kernel/proc_powerpc.c b/arch/powerpc/kernel/proc_powerpc.c
index 910d2082e05fd86bd1146815d4b67633a6f2b459..3bda365843e44357538651c6c24c11a41de2eb06 100644
--- a/arch/powerpc/kernel/proc_powerpc.c
+++ b/arch/powerpc/kernel/proc_powerpc.c@@ -14,7 +14,7 @@ #include <asm/rtas.h> #include <linux/uaccess.h> -#ifdef CONFIG_PPC64 +#ifdef CONFIG_PPC64_PROC_SYSTEMCFG static loff_t page_map_seek(struct file *file, loff_t off, int whence) {
@@ -59,7 +59,7 @@ static int __init proc_ppc64_init(void) } __initcall(proc_ppc64_init); -#endif /* CONFIG_PPC64 */ +#endif /* CONFIG_PPC64_PROC_SYSTEMCFG */ /* * Create the ppc64 and ppc64/rtas directories early. This allows us to
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2.47.0