Commit 02a771c9 authored by Michael Ellerman's avatar Michael Ellerman
Browse files

powerpc/32: Select ARCH_SPLIT_ARG64 



On 32-bit kernels, 64-bit syscall arguments are split into two
registers. For that to work with syscall wrappers, the prototype of the
syscall must have the argument split so that the wrapper macro properly
unpacks the arguments from pt_regs.

The fanotify_mark() syscall is one such syscall, which already has a
split prototype, guarded behind ARCH_SPLIT_ARG64.

So select ARCH_SPLIT_ARG64 to get that prototype and fix fanotify_mark()
on 32-bit kernels with syscall wrappers.

Note also that fanotify_mark() is the only usage of ARCH_SPLIT_ARG64.

Fixes: 7e92e01b ("powerpc: Provide syscall wrapper")
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20221101034852.2340319-1-mpe@ellerman.id.au
parent ce883a2b

arch/powerpc/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -147,6 +147,7 @@ config PPC 
	select ARCH_MIGHT_HAVE_PC_SERIO

	select ARCH_OPTIONAL_KERNEL_RWX		if ARCH_HAS_STRICT_KERNEL_RWX

	select ARCH_OPTIONAL_KERNEL_RWX_DEFAULT

	select ARCH_SPLIT_ARG64			if PPC32

	select ARCH_STACKWALK

	select ARCH_SUPPORTS_ATOMIC_RMW

	select ARCH_SUPPORTS_DEBUG_PAGEALLOC	if PPC_BOOK3S || PPC_8xx || 40x