linux-kernel - [PATCH v3 3/3] powerpc/mm: print hash info in a helper

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Message-Id: <974ccc233b182fbc2539a1d597230854ed769523.1556296364.git.christophe.leroy@c-s.fr>
Date:   Fri, 26 Apr 2019 16:36:39 +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 3/3] powerpc/mm: print hash info in a helper

Reduce #ifdef mess by defining a helper to print
hash info at startup.

In the meantime, remove the display of hash table address
to reduce leak of non necessary information.

Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
---
v2: added header to avoid sparse warning
v3: rebased due to commit a092a03fa942 ("powerpc/mm: Print kernel map details to dmesg")

 arch/powerpc/kernel/setup-common.c | 22 +---------------------
 arch/powerpc/mm/hash_utils_64.c    | 13 +++++++++++++
 arch/powerpc/mm/mmu_decl.h         |  5 ++++-
 arch/powerpc/mm/ppc_mmu_32.c       |  9 ++++++++-
 4 files changed, 26 insertions(+), 23 deletions(-)

diff --git a/arch/powerpc/kernel/setup-common.c b/arch/powerpc/kernel/setup-common.c
index 1729bf409562..ef424e934ee7 100644
--- a/arch/powerpc/kernel/setup-common.c
+++ b/arch/powerpc/kernel/setup-common.c
@@ -799,12 +799,6 @@ void arch_setup_pdev_archdata(struct platform_device *pdev)
 static __init void print_system_info(void)
 {
 	pr_info("-----------------------------------------------------\n");
-#ifdef CONFIG_PPC_BOOK3S_64
-	pr_info("ppc64_pft_size    = 0x%llx\n", ppc64_pft_size);
-#endif
-#ifdef CONFIG_PPC_BOOK3S_32
-	pr_info("Hash_size         = 0x%lx\n", Hash_size);
-#endif
 	pr_info("phys_mem_size     = 0x%llx\n",
 		(unsigned long long)memblock_phys_mem_size());
 
@@ -826,21 +820,7 @@ static __init void print_system_info(void)
 	pr_info("firmware_features = 0x%016lx\n", powerpc_firmware_features);
 #endif
 
-#ifdef CONFIG_PPC_BOOK3S_64
-	if (htab_address)
-		pr_info("htab_address      = 0x%p\n", htab_address);
-	if (htab_hash_mask)
-		pr_info("htab_hash_mask    = 0x%lx\n", htab_hash_mask);
-	pr_info("kernel vmalloc start   = 0x%lx\n", KERN_VIRT_START);
-	pr_info("kernel IO start        = 0x%lx\n", KERN_IO_START);
-	pr_info("kernel vmemmap start   = 0x%lx\n", (unsigned long)vmemmap);
-#endif
-#ifdef CONFIG_PPC_BOOK3S_32
-	if (Hash)
-		pr_info("Hash              = 0x%p\n", Hash);
-	if (Hash_mask)
-		pr_info("Hash_mask         = 0x%lx\n", Hash_mask);
-#endif
+	print_system_hash_info();
 
 	if (PHYSICAL_START > 0)
 		pr_info("physical_start    = 0x%llx\n",
diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c
index f727197de713..098bae10ceab 100644
--- a/arch/powerpc/mm/hash_utils_64.c
+++ b/arch/powerpc/mm/hash_utils_64.c
@@ -65,6 +65,8 @@
 #include <asm/pte-walk.h>
 #include <asm/asm-prototypes.h>
 
+#include "mmu_decl.h"
+
 #ifdef DEBUG
 #define DBG(fmt...) udbg_printf(fmt)
 #else
@@ -1928,3 +1930,14 @@ static int __init hash64_debugfs(void)
 }
 machine_device_initcall(pseries, hash64_debugfs);
 #endif /* CONFIG_DEBUG_FS */
+
+void __init print_system_hash_info(void)
+{
+	pr_info("ppc64_pft_size    = 0x%llx\n", ppc64_pft_size);
+
+	if (htab_hash_mask)
+		pr_info("htab_hash_mask    = 0x%lx\n", htab_hash_mask);
+	pr_info("kernel vmalloc start   = 0x%lx\n", KERN_VIRT_START);
+	pr_info("kernel IO start        = 0x%lx\n", KERN_IO_START);
+	pr_info("kernel vmemmap start   = 0x%lx\n", (unsigned long)vmemmap);
+}
diff --git a/arch/powerpc/mm/mmu_decl.h b/arch/powerpc/mm/mmu_decl.h
index f7f1374ba3ee..dc617ade83ab 100644
--- a/arch/powerpc/mm/mmu_decl.h
+++ b/arch/powerpc/mm/mmu_decl.h
@@ -83,6 +83,8 @@ static inline void _tlbivax_bcast(unsigned long address, unsigned int pid,
 }
 #endif
 
+static inline void print_system_hash_info(void) {}
+
 #else /* CONFIG_PPC_MMU_NOHASH */
 
 extern void hash_preload(struct mm_struct *mm, unsigned long ea,
@@ -92,6 +94,8 @@ extern void hash_preload(struct mm_struct *mm, unsigned long ea,
 extern void _tlbie(unsigned long address);
 extern void _tlbia(void);
 
+void print_system_hash_info(void);
+
 #endif /* CONFIG_PPC_MMU_NOHASH */
 
 #ifdef CONFIG_PPC32
@@ -105,7 +109,6 @@ extern unsigned int rtas_data, rtas_size;
 
 struct hash_pte;
 extern struct hash_pte *Hash;
-extern unsigned long Hash_size, Hash_mask;
 
 #endif /* CONFIG_PPC32 */
 
diff --git a/arch/powerpc/mm/ppc_mmu_32.c b/arch/powerpc/mm/ppc_mmu_32.c
index c908538720ac..f2e88b8a48e1 100644
--- a/arch/powerpc/mm/ppc_mmu_32.c
+++ b/arch/powerpc/mm/ppc_mmu_32.c
@@ -37,7 +37,7 @@
 #include "mmu_decl.h"
 
 struct hash_pte *Hash;
-unsigned long Hash_size, Hash_mask;
+static unsigned long Hash_size, Hash_mask;
 unsigned long _SDR1;
 
 struct ppc_bat BATS[8][2];	/* 8 pairs of IBAT, DBAT */
@@ -393,6 +393,13 @@ void setup_initial_memory_limit(phys_addr_t first_memblock_base,
 		memblock_set_current_limit(min_t(u64, first_memblock_size, 0x10000000));
 }
 
+void __init print_system_hash_info(void)
+{
+	pr_info("Hash_size         = 0x%lx\n", Hash_size);
+	if (Hash_mask)
+		pr_info("Hash_mask         = 0x%lx\n", Hash_mask);
+}
+
 #ifdef CONFIG_PPC_KUEP
 void __init setup_kuep(bool disabled)
 {
-- 
2.13.3