linux-kernel - [RFC PATCH 08/11] powerpc: Add and use LPPACA

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Date:   Thu, 23 Aug 2018 23:59:30 -0300
From:   Thiago Jung Bauermann <bauerman@...ux.ibm.com>
To:     linuxppc-dev@...ts.ozlabs.org
Cc:     iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        Alexey Kardashevskiy <aik@...abs.ru>,
        Anshuman Khandual <anshuman.linux@...il.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Christoph Hellwig <hch@....de>,
        Michael Ellerman <mpe@...erman.id.au>,
        Mike Anderson <andmike@...ux.ibm.com>,
        Paul Mackerras <paulus@...ba.org>,
        Ram Pai <linuxram@...ibm.com>,
        Thiago Jung Bauermann <bauerman@...ux.ibm.com>
Subject: [RFC PATCH 08/11] powerpc: Add and use LPPACA_SIZE constant

Helps document what the hard-coded number means.

Suggested-by: Alexey Kardashevskiy <aik@...ux.ibm.com>
Signed-off-by: Thiago Jung Bauermann <bauerman@...ux.ibm.com>
---
 arch/powerpc/kernel/paca.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/arch/powerpc/kernel/paca.c b/arch/powerpc/kernel/paca.c
index 0ee3e6d50f28..1edf8695019d 100644
--- a/arch/powerpc/kernel/paca.c
+++ b/arch/powerpc/kernel/paca.c
@@ -24,6 +24,8 @@
 #define boot_cpuid 0
 #endif
 
+#define LPPACA_SIZE 0x400
+
 static void *__init alloc_paca_data(unsigned long size, unsigned long align,
 				unsigned long limit, int cpu)
 {
@@ -70,7 +72,7 @@ static inline void init_lppaca(struct lppaca *lppaca)
 
 	*lppaca = (struct lppaca) {
 		.desc = cpu_to_be32(0xd397d781),	/* "LpPa" */
-		.size = cpu_to_be16(0x400),
+		.size = cpu_to_be16(LPPACA_SIZE),
 		.fpregs_in_use = 1,
 		.slb_count = cpu_to_be16(64),
 		.vmxregs_in_use = 0,
@@ -80,14 +82,13 @@ static inline void init_lppaca(struct lppaca *lppaca)
 static struct lppaca * __init new_lppaca(int cpu, unsigned long limit)
 {
 	struct lppaca *lp;
-	size_t size = 0x400;
 
-	BUILD_BUG_ON(size < sizeof(struct lppaca));
+	BUILD_BUG_ON(LPPACA_SIZE < sizeof(struct lppaca));
 
 	if (early_cpu_has_feature(CPU_FTR_HVMODE))
 		return NULL;
 
-	lp = alloc_paca_data(size, 0x400, limit, cpu);
+	lp = alloc_paca_data(LPPACA_SIZE, 0x400, limit, cpu);
 	init_lppaca(lp);
 
 	return lp;