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

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Message-Id: <d61e312b60352073192975746c24901a37d881c7.1547132111.git.christophe.leroy@c-s.fr>
Date:   Thu, 10 Jan 2019 14:56:26 +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] 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>
---
 arch/powerpc/mm/8xx_mmu.c | 65 +++++++++++++++++++++--------------------------
 1 file changed, 29 insertions(+), 36 deletions(-)

diff --git a/arch/powerpc/mm/8xx_mmu.c b/arch/powerpc/mm/8xx_mmu.c
index 1f339deea7e2..2300fe88e1f2 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)
@@ -110,18 +106,15 @@ 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);
-#ifndef CONFIG_PIN_TLB_TEXT
-		mmu_patch_cmp_limit(&patch__itlbmiss_linmem_top,
-				    _ALIGN(__pa(_einittext), 8 << 20));
-#endif
+		if (!IS_ENABLED(CONFIG_PIN_TLB_TEXT))
+			mmu_patch_cmp_limit(&patch__itlbmiss_linmem_top,
+					    _ALIGN(__pa(_einittext), 8 << 20));
 	}
 
 	mmu_patch_cmp_limit(&patch__dtlbmiss_linmem_top, mapped);
@@ -166,14 +159,14 @@ void set_context(unsigned long id, pgd_t *pgd)
 {
 	s16 offset = (s16)(__pa(swapper_pg_dir));
 
-#ifdef CONFIG_BDI_SWITCH
-	pgd_t	**ptr = *(pgd_t ***)(KERNELBASE + 0xf0);
+	if (IS_ENABLED(CONFIG_BDI_SWITCH)) {
+		pgd_t	**ptr = *(pgd_t ***)(KERNELBASE + 0xf0);
 
-	/* Context switch the PTE pointer for the Abatron BDI2000.
-	 * The PGDIR is passed as second argument.
-	 */
-	*(ptr + 1) = pgd;
-#endif
+		/* Context switch the PTE pointer for the Abatron BDI2000.
+		 * The PGDIR is passed as second argument.
+		 */
+		*(ptr + 1) = pgd;
+	}
 
 	/* Register M_TWB will contain base address of level 1 table minus the
 	 * lower part of the kernel PGDIR base address, so that all accesses to
-- 
2.13.3