Re: [PATCH v6 20/25] powerpc: Change system_call_exception calling convention

2022-09-23 Thread Nicholas Piggin
On Wed Sep 21, 2022 at 4:56 PM AEST, Rohan McLure wrote: > 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

[PATCH v6 20/25] powerpc: Change system_call_exception calling convention

2022-09-21 Thread Rohan McLure
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