From: Christophe Leroy Date: Fri, 12 Mar 2021 12:50:35 +0000 (+0000) Subject: powerpc/32: Don't save thread.regs on interrupt entry X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=db297c3b07af7856fb7c666fbc9792d8e37556be;p=uclinux-h8%2Flinux.git powerpc/32: Don't save thread.regs on interrupt entry Since commit 06d67d54741a ("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: Nicholas Piggin Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20d52c627303d63e461797df13e6890fc04017d0.1615552867.git.christophe.leroy@csgroup.eu --- diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S index 79311d0bd09b..1e201fc4a590 100644 --- a/arch/powerpc/kernel/entry_32.S +++ b/arch/powerpc/kernel/entry_32.S @@ -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: