linux-kernel - [PATCH v2 1/4] powerpc: Remove flush_instruction

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Date:   Fri, 14 Aug 2020 05:56:24 +0000 (UTC)
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>, hch@...radead.org
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH v2 1/4] powerpc: Remove flush_instruction_cache for book3s/32

The only callers of flush_instruction_cache() are:

arch/powerpc/kernel/swsusp_booke.S:	bl flush_instruction_cache
arch/powerpc/mm/nohash/40x.c:	flush_instruction_cache();
arch/powerpc/mm/nohash/44x.c:	flush_instruction_cache();
arch/powerpc/mm/nohash/fsl_booke.c:	flush_instruction_cache();
arch/powerpc/platforms/44x/machine_check.c:			flush_instruction_cache();
arch/powerpc/platforms/44x/machine_check.c:		flush_instruction_cache();

This function is not used by book3s/32, drop it.

Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
---
 arch/powerpc/kernel/misc_32.S | 12 ++----------
 1 file changed, 2 insertions(+), 10 deletions(-)

diff --git a/arch/powerpc/kernel/misc_32.S b/arch/powerpc/kernel/misc_32.S
index b24f866fef81..5c074c2ff5b5 100644
--- a/arch/powerpc/kernel/misc_32.S
+++ b/arch/powerpc/kernel/misc_32.S
@@ -271,9 +271,8 @@ _ASM_NOKPROBE_SYMBOL(real_writeb)
 
 /*
  * Flush instruction cache.
- * This is a no-op on the 601.
  */
-#ifndef CONFIG_PPC_8xx
+#if !defined(CONFIG_PPC_8xx) && !defined(CONFIG_PPC_BOOK3S_32)
 _GLOBAL(flush_instruction_cache)
 #if defined(CONFIG_4xx)
 	lis	r3, KERNELBASE@h
@@ -290,18 +289,11 @@ _GLOBAL(flush_instruction_cache)
 	mfspr	r3,SPRN_L1CSR1
 	ori	r3,r3,L1CSR1_ICFI|L1CSR1_ICLFR
 	mtspr	SPRN_L1CSR1,r3
-#elif defined(CONFIG_PPC_BOOK3S_601)
-	blr			/* for 601, do nothing */
-#else
-	/* 603/604 processor - use invalidate-all bit in HID0 */
-	mfspr	r3,SPRN_HID0
-	ori	r3,r3,HID0_ICFI
-	mtspr	SPRN_HID0,r3
 #endif /* CONFIG_4xx */
 	isync
 	blr
 EXPORT_SYMBOL(flush_instruction_cache)
-#endif /* CONFIG_PPC_8xx */
+#endif
 
 /*
  * Copy a whole page.  We use the dcbz instruction on the destination
-- 
2.25.0