From: Satheesh Rajendran <sathnaga@linux.vnet.ibm.com>
To: linuxppc-dev@lists.ozlabs.org
Cc: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>,
Ram Pai <linuxram@us.ibm.com>,
linux-kernel@vger.kernel.org,
Satheesh Rajendran <sathnaga@linux.vnet.ibm.com>,
Laurent Dufour <ldufour@linux.ibm.com>,
Thiago Jung Bauermann <bauerman@linux.ibm.com>
Subject: [PATCH V2] powerpc/pseries/svm: Drop unused align argument in alloc_shared_lppaca() function
Date: Fri, 12 Jun 2020 19:59:53 +0530 [thread overview]
Message-ID: <20200612142953.135408-1-sathnaga@linux.vnet.ibm.com> (raw)
Argument "align" in alloc_shared_lppaca() was unused inside the
function. Let's drop it and update code comment for page alignment.
Cc: linux-kernel@vger.kernel.org
Cc: Thiago Jung Bauermann <bauerman@linux.ibm.com>
Cc: Ram Pai <linuxram@us.ibm.com>
Cc: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Cc: Laurent Dufour <ldufour@linux.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Reviewed-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
Signed-off-by: Satheesh Rajendran <sathnaga@linux.vnet.ibm.com>
---
V2:
Added reviewed by Thiago.
Dropped align argument as per Michael suggest.
Modified commit msg.
V1: http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20200609113909.17236-1-sathnaga@linux.vnet.ibm.com/
---
arch/powerpc/kernel/paca.c | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)
diff --git a/arch/powerpc/kernel/paca.c b/arch/powerpc/kernel/paca.c
index 8d96169c597e..a174d64d9b4d 100644
--- a/arch/powerpc/kernel/paca.c
+++ b/arch/powerpc/kernel/paca.c
@@ -57,8 +57,8 @@ static void *__init alloc_paca_data(unsigned long size, unsigned long align,
#define LPPACA_SIZE 0x400
-static void *__init alloc_shared_lppaca(unsigned long size, unsigned long align,
- unsigned long limit, int cpu)
+static void *__init alloc_shared_lppaca(unsigned long size, unsigned long limit,
+ int cpu)
{
size_t shared_lppaca_total_size = PAGE_ALIGN(nr_cpu_ids * LPPACA_SIZE);
static unsigned long shared_lppaca_size;
@@ -68,6 +68,12 @@ static void *__init alloc_shared_lppaca(unsigned long size, unsigned long align,
if (!shared_lppaca) {
memblock_set_bottom_up(true);
+ /* See Documentation/powerpc/ultravisor.rst for mode details
+ *
+ * UV/HV data share is in PAGE granularity, In order to
+ * minimize the number of pages shared and maximize the
+ * use of a page, let's use page align.
+ */
shared_lppaca =
memblock_alloc_try_nid(shared_lppaca_total_size,
PAGE_SIZE, MEMBLOCK_LOW_LIMIT,
@@ -122,7 +128,7 @@ static struct lppaca * __init new_lppaca(int cpu, unsigned long limit)
return NULL;
if (is_secure_guest())
- lp = alloc_shared_lppaca(LPPACA_SIZE, 0x400, limit, cpu);
+ lp = alloc_shared_lppaca(LPPACA_SIZE, limit, cpu);
else
lp = alloc_paca_data(LPPACA_SIZE, 0x400, limit, cpu);
--
2.26.2
next reply other threads:[~2020-06-12 14:33 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-12 14:29 Satheesh Rajendran [this message]
2020-06-16 8:24 ` [PATCH V2] powerpc/pseries/svm: Drop unused align argument in alloc_shared_lppaca() function Laurent Dufour
2020-06-26 4:46 ` Michael Ellerman
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