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authorRohan McLure <rmclure@linux.ibm.com>2022-09-21 16:56:00 +1000
committerMichael Ellerman <mpe@ellerman.id.au>2022-09-28 19:22:09 +1000
commitf8971c627b14040e533768985a99f4fd6ffa420f (patch)
treeb13a12041449c8ac129cc0479be77ded55e82f9e /arch/powerpc/include
parent8640de0dee49cec50040d9845a2bc96fd15adc9e (diff)
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powerpc: Change system_call_exception calling convention
Change system_call_exception arguments to pass a pointer to a stack frame container caller state, as well as the original r0, which determines the number of the syscall. This has been observed to yield improved performance to passing them by registers, circumventing the need to allocate a stack frame. Signed-off-by: Rohan McLure <rmclure@linux.ibm.com> Reviewed-by: Nicholas Piggin <npiggin@gmail.com> [mpe: Retain clearing of high bits of args for compat tasks] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20220921065605.1051927-21-rmclure@linux.ibm.com
Diffstat (limited to 'arch/powerpc/include')
-rw-r--r--arch/powerpc/include/asm/interrupt.h3
1 files changed, 1 insertions, 2 deletions
diff --git a/arch/powerpc/include/asm/interrupt.h b/arch/powerpc/include/asm/interrupt.h
index 84a1cdc3204c..0d3405bd55c4 100644
--- a/arch/powerpc/include/asm/interrupt.h
+++ b/arch/powerpc/include/asm/interrupt.h
@@ -665,8 +665,7 @@ static inline void interrupt_cond_local_irq_enable(struct pt_regs *regs)
local_irq_enable();
}
-long system_call_exception(long r3, long r4, long r5, long r6, long r7, long r8,
- unsigned long r0, struct pt_regs *regs);
+long system_call_exception(struct pt_regs *regs, unsigned long r0);
notrace unsigned long syscall_exit_prepare(unsigned long r3, struct pt_regs *regs, long scv);
notrace unsigned long interrupt_exit_user_prepare(struct pt_regs *regs);
notrace unsigned long interrupt_exit_kernel_prepare(struct pt_regs *regs);