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| author |  Nicholas Piggin <npiggin@gmail.com>
| 2023-03-25 22:28:59 +1000 |
|---|---|---|
| committer |  Michael Ellerman <mpe@ellerman.id.au>
| 2023-04-11 23:13:32 +1000 |
| commit | af5ca9d5c8b45244b237d7a5534e1ec2d01cce8e (patch) | |
| tree | eb23a6cd9966f8b18a903abbb9d7338b4194f4f7 /arch/powerpc/kernel/interrupt_64.S | |
| parent | powerpc: copy_thread make ret_from_fork register setup consistent (diff) | |
| download | linux-af5ca9d5c8b45244b237d7a5534e1ec2d01cce8e.tar.gz linux-af5ca9d5c8b45244b237d7a5534e1ec2d01cce8e.tar.bz2 linux-af5ca9d5c8b45244b237d7a5534e1ec2d01cce8e.zip | |
powerpc: use switch frame for ret_from_kernel_thread parameters
The kernel thread path in copy_thread creates a user interrupt frame on
stack and stores the function and arg parameters there, and
ret_from_kernel_thread loads them. This is a slightly confusing way to
overload that frame. Non-volatile registers are loaded from the switch
frame, so the parameters can be stored there. The user interrupt frame
is now only used by user threads when they return to user.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20230325122904.2375060-4-npiggin@gmail.com
Diffstat (limited to 'arch/powerpc/kernel/interrupt_64.S')
| -rw-r--r-- | arch/powerpc/kernel/interrupt_64.S | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/interrupt_64.S b/arch/powerpc/kernel/interrupt_64.S index fccc34489add..d60e7e7564df 100644 --- a/arch/powerpc/kernel/interrupt_64.S +++ b/arch/powerpc/kernel/interrupt_64.S @@ -741,7 +741,6 @@ _GLOBAL(ret_from_fork) _GLOBAL(ret_from_kernel_thread) bl schedule_tail - REST_NVGPRS(r1) mtctr r14 mr r3,r15 #ifdef CONFIG_PPC64_ELF_ABI_V2 |