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From:   Denis Efremov <efremov@linux.com>
To:     Bjorn Helgaas <bhelgaas@google.com>
Cc:     Denis Efremov <efremov@linux.com>, linux-kernel@vger.kernel.org,
        linux-pci@vger.kernel.org, Sebastian Ott <sebott@linux.ibm.com>,
        Gerald Schaefer <gerald.schaefer@de.ibm.com>,
        "H. Peter Anvin" <hpa@zytor.com>,
        Giuseppe Cavallaro <peppe.cavallaro@st.com>,
        Alexandre Torgue <alexandre.torgue@st.com>,
        Matt Porter <mporter@kernel.crashing.org>,
        Alexandre Bounine <alex.bou9@gmail.com>,
        Peter Jones <pjones@redhat.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
        Cornelia Huck <cohuck@redhat.com>,
        Alex Williamson <alex.williamson@redhat.com>,
        Andrew Murray <andrew.murray@arm.com>,
        Jose Abreu <Jose.Abreu@synopsys.com>, kvm@vger.kernel.org,
        linux-fbdev@vger.kernel.org, netdev@vger.kernel.org,
        x86@kernel.org, linux-s390@vger.kernel.org
Subject: [PATCH v2 01/10] PCI: Add define for the number of standard PCI BARs
Date:   Fri, 16 Aug 2019 12:24:28 +0300
Message-Id: <20190816092437.31846-2-efremov@linux.com>
In-Reply-To: <20190816092437.31846-1-efremov@linux.com>
References: <20190816092437.31846-1-efremov@linux.com>
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Code that iterates over all standard PCI BARs typically uses
PCI_STD_RESOURCE_END. However, it requires the "unusual" loop condition
"i <= PCI_STD_RESOURCE_END" rather than something more standard like
"i < PCI_STD_NUM_BARS".

This patch adds the definition PCI_STD_NUM_BARS which is equivalent to
"PCI_STD_RESOURCE_END + 1" and updates loop conditions to use it.

Signed-off-by: Denis Efremov <efremov@linux.com>
---
 drivers/pci/quirks.c          | 2 +-
 include/linux/pci.h           | 2 +-
 include/uapi/linux/pci_regs.h | 1 +
 3 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 208aacf39329..02bdf3a0231e 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -475,7 +475,7 @@ static void quirk_extend_bar_to_page(struct pci_dev *dev)
 {
 	int i;
 
-	for (i = 0; i <= PCI_STD_RESOURCE_END; i++) {
+	for (i = 0; i < PCI_STD_NUM_BARS; i++) {
 		struct resource *r = &dev->resource[i];
 
 		if (r->flags & IORESOURCE_MEM && resource_size(r) < PAGE_SIZE) {
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 9e700d9f9f28..7b9590d5dc2d 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -76,7 +76,7 @@ enum pci_mmap_state {
 enum {
 	/* #0-5: standard PCI resources */
 	PCI_STD_RESOURCES,
-	PCI_STD_RESOURCE_END = 5,
+	PCI_STD_RESOURCE_END = PCI_STD_RESOURCES + PCI_STD_NUM_BARS - 1,
 
 	/* #6: expansion ROM resource */
 	PCI_ROM_RESOURCE,
diff --git a/include/uapi/linux/pci_regs.h b/include/uapi/linux/pci_regs.h
index f28e562d7ca8..68b571d491eb 100644
--- a/include/uapi/linux/pci_regs.h
+++ b/include/uapi/linux/pci_regs.h
@@ -34,6 +34,7 @@
  * of which the first 64 bytes are standardized as follows:
  */
 #define PCI_STD_HEADER_SIZEOF	64
+#define PCI_STD_NUM_BARS	6	/* Number of standard BARs */
 #define PCI_VENDOR_ID		0x00	/* 16 bits */
 #define PCI_DEVICE_ID		0x02	/* 16 bits */
 #define PCI_COMMAND		0x04	/* 16 bits */
-- 
2.21.0