Commit 5088a624 authored by Nicholas Piggin's avatar Nicholas Piggin Committed by Michael Ellerman
Browse files

powerpc/64: ret_from_fork avoid restoring regs twice 



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: default avatarNicholas Piggin <npiggin@gmail.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20230325122904.2375060-5-npiggin@gmail.com
parent af5ca9d5

arch/powerpc/kernel/interrupt_64.S

+2 −2
Original line number Diff line number Diff line
@@ -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