Commit db297c3b authored by Christophe Leroy's avatar Christophe Leroy Committed by Michael Ellerman
Browse files

powerpc/32: Don't save thread.regs on interrupt entry 



Since commit 06d67d54 ("powerpc: make process.c suitable for both
32-bit and 64-bit"), thread.regs is set on task creation, no need to
set it again and again at each interrupt entry as it never change.

Suggested-by: default avatarNicholas Piggin <npiggin@gmail.com>
Signed-off-by: default avatarChristophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20d52c627303d63e461797df13e6890fc04017d0.1615552867.git.christophe.leroy@csgroup.eu
parent b96bae3a

arch/powerpc/kernel/entry_32.S

+1 −4
Original line number Diff line number Diff line
@@ -97,10 +97,8 @@ transfer_to_handler: 
	stw	r2,_XER(r11)

	mfspr	r12,SPRN_SPRG_THREAD

	tovirt(r12, r12)

	beq	2f			/* if from user, fix up THREAD.regs */

	beq	2f

	addi	r2, r12, -THREAD

	addi	r11,r1,STACK_FRAME_OVERHEAD

	stw	r11,PT_REGS(r12)

#ifdef CONFIG_PPC_BOOK3S_32

	kuep_lock r11, r12

#endif
@@ -147,7 +145,6 @@ transfer_to_syscall: 
	/* Calling convention has r9 = orig r0, r10 = regs */

	addi	r10,r1,STACK_FRAME_OVERHEAD

	mr	r9,r0

	stw	r10,THREAD+PT_REGS(r2)

	bl	system_call_exception



ret_from_syscall: