diff options
| author | Rohan McLure <rmclure@linux.ibm.com> | 2022-09-21 09:56:00 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2022-09-28 12:22:09 +0300 |
| commit | f8971c627b14040e533768985a99f4fd6ffa420f (patch) | |
| tree | b13a12041449c8ac129cc0479be77ded55e82f9e /arch/powerpc/include | |
| parent | 8640de0dee49cec50040d9845a2bc96fd15adc9e (diff) | |
| download | linux-f8971c627b14040e533768985a99f4fd6ffa420f.tar.xz | |
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.h | 3 |
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); |