From: Nicholas Piggin <npiggin@gmail.com>
To: linuxppc-dev@lists.ozlabs.org
Cc: Nicholas Piggin <npiggin@gmail.com>
Subject: [PATCH 4/8] powerpc/64: ret_from_fork avoid restoring regs twice
Date: Wed, 1 Feb 2023 02:55:30 +1000 [thread overview]
Message-ID: <20230131165534.601490-5-npiggin@gmail.com> (raw)
In-Reply-To: <20230131165534.601490-1-npiggin@gmail.com>
If the system call return path always restores NVGPRs then there is no
need for ret_from_fork to do it. The HANDLER_RESTORE_NVGPRS does the
right thing for this.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
arch/powerpc/kernel/interrupt_64.S | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/powerpc/kernel/interrupt_64.S b/arch/powerpc/kernel/interrupt_64.S
index d60e7e7564df..bac1f89501ac 100644
--- a/arch/powerpc/kernel/interrupt_64.S
+++ b/arch/powerpc/kernel/interrupt_64.S
@@ -728,14 +728,14 @@ DEFINE_FIXED_SYMBOL(__end_soft_masked, text)
#ifdef CONFIG_PPC_BOOK3S
_GLOBAL(ret_from_fork_scv)
bl schedule_tail
- REST_NVGPRS(r1)
+ HANDLER_RESTORE_NVGPRS()
li r3,0 /* fork() return value */
b .Lsyscall_vectored_common_exit
#endif
_GLOBAL(ret_from_fork)
bl schedule_tail
- REST_NVGPRS(r1)
+ HANDLER_RESTORE_NVGPRS()
li r3,0 /* fork() return value */
b .Lsyscall_exit
--
2.37.2
next prev parent reply other threads:[~2023-01-31 17:00 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-31 16:55 [PATCH 0/8] powerpc: improve copy_thread Nicholas Piggin
2023-01-31 16:55 ` [PATCH 1/8] powerpc: copy_thread remove unused pkey code Nicholas Piggin
2023-01-31 16:55 ` [PATCH 2/8] powerpc: copy_thread make ret_from_fork register setup consistent Nicholas Piggin
2023-01-31 16:55 ` [PATCH 3/8] powerpc: use switch frame for ret_from_kernel_thread parameters Nicholas Piggin
2023-01-31 16:55 ` Nicholas Piggin [this message]
2023-01-31 16:55 ` [PATCH 5/8] powerpc: copy_thread differentiate kthreads and user mode threads Nicholas Piggin
2023-01-31 16:55 ` [PATCH 6/8] powerpc: differentiate kthread from user kernel thread start Nicholas Piggin
2023-01-31 16:55 ` [PATCH 7/8] powerpc: copy_thread don't set _TIF_RESTOREALL Nicholas Piggin
2023-01-31 16:55 ` [PATCH 8/8] powerpc: copy_thread don't set ppr in user interrupt frame regs Nicholas Piggin
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