linux-kernel - [PATCH v3 1/2] powerpc/8xx: replace most #ifdef by IS_ENABLED() in 8xx

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Message-Id: <21f171c0cbd460905a134ce9b9afc2ecb5277269.1550073540.git.christophe.leroy@c-s.fr>
Date:   Wed, 13 Feb 2019 16:06:19 +0000 (UTC)
From:   Christophe Leroy <christophe.leroy@....fr>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH v3 1/2] powerpc/8xx: replace most #ifdef by IS_ENABLED() in
 8xx_mmu.c

This patch replaces most #ifdef mess by IS_ENABLED() in 8xx_mmu.c
This has the advantage of allowing syntax verification at compile
time regardless of selected options.

Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
---
 v3: no change

 v2: left CONFIG_BDI_SWITCH change aside as it goes away in another patch

 arch/powerpc/mm/8xx_mmu.c | 44 +++++++++++++++++++-------------------------
 1 file changed, 19 insertions(+), 25 deletions(-)

diff --git a/arch/powerpc/mm/8xx_mmu.c b/arch/powerpc/mm/8xx_mmu.c
index bfa503cff351..92b677faea8c 100644
--- a/arch/powerpc/mm/8xx_mmu.c
+++ b/arch/powerpc/mm/8xx_mmu.c
@@ -66,26 +66,22 @@ unsigned long p_block_mapped(phys_addr_t pa)
 void __init MMU_init_hw(void)
 {
 	/* PIN up to the 3 first 8Mb after IMMR in DTLB table */
-#ifdef CONFIG_PIN_TLB_DATA
-	unsigned long ctr = mfspr(SPRN_MD_CTR) & 0xfe000000;
-	unsigned long flags = 0xf0 | MD_SPS16K | _PAGE_SH | _PAGE_DIRTY;
-#ifdef CONFIG_PIN_TLB_IMMR
-	int i = 29;
-#else
-	int i = 28;
-#endif
-	unsigned long addr = 0;
-	unsigned long mem = total_lowmem;
-
-	for (; i < 32 && mem >= LARGE_PAGE_SIZE_8M; i++) {
-		mtspr(SPRN_MD_CTR, ctr | (i << 8));
-		mtspr(SPRN_MD_EPN, (unsigned long)__va(addr) | MD_EVALID);
-		mtspr(SPRN_MD_TWC, MD_PS8MEG | MD_SVALID);
-		mtspr(SPRN_MD_RPN, addr | flags | _PAGE_PRESENT);
-		addr += LARGE_PAGE_SIZE_8M;
-		mem -= LARGE_PAGE_SIZE_8M;
+	if (IS_ENABLED(CONFIG_PIN_TLB_DATA)) {
+		unsigned long ctr = mfspr(SPRN_MD_CTR) & 0xfe000000;
+		unsigned long flags = 0xf0 | MD_SPS16K | _PAGE_SH | _PAGE_DIRTY;
+		int i = IS_ENABLED(CONFIG_PIN_TLB_IMMR) ? 29 : 28;
+		unsigned long addr = 0;
+		unsigned long mem = total_lowmem;
+
+		for (; i < 32 && mem >= LARGE_PAGE_SIZE_8M; i++) {
+			mtspr(SPRN_MD_CTR, ctr | (i << 8));
+			mtspr(SPRN_MD_EPN, (unsigned long)__va(addr) | MD_EVALID);
+			mtspr(SPRN_MD_TWC, MD_PS8MEG | MD_SVALID);
+			mtspr(SPRN_MD_RPN, addr | flags | _PAGE_PRESENT);
+			addr += LARGE_PAGE_SIZE_8M;
+			mem -= LARGE_PAGE_SIZE_8M;
+		}
 	}
-#endif
 }
 
 static void __init mmu_mapin_immr(void)
@@ -110,12 +106,10 @@ unsigned long __init mmu_mapin_ram(unsigned long top)
 	if (__map_without_ltlbs) {
 		mapped = 0;
 		mmu_mapin_immr();
-#ifndef CONFIG_PIN_TLB_IMMR
-		patch_instruction_site(&patch__dtlbmiss_immr_jmp, PPC_INST_NOP);
-#endif
-#ifndef CONFIG_PIN_TLB_TEXT
-		mmu_patch_cmp_limit(&patch__itlbmiss_linmem_top, 0);
-#endif
+		if (!IS_ENABLED(CONFIG_PIN_TLB_IMMR))
+			patch_instruction_site(&patch__dtlbmiss_immr_jmp, PPC_INST_NOP);
+		if (!IS_ENABLED(CONFIG_PIN_TLB_TEXT))
+			mmu_patch_cmp_limit(&patch__itlbmiss_linmem_top, 0);
 	} else {
 		mapped = top & ~(LARGE_PAGE_SIZE_8M - 1);
 	}
-- 
2.13.3