linux-kernel - [PATCH v2] perf/x86/uncore: fix compilation warning in snb_uncore_imc_init

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Date:	Wed, 12 Mar 2014 00:53:30 +0100
From:	Stephane Eranian <eranian@...gle.com>
To:	linux-kernel@...r.kernel.org
Cc:	peterz@...radead.org, mingo@...e.hu, sfr@...b.auug.org.au,
	hpa@...or.com
Subject: [PATCH v2] perf/x86/uncore: fix compilation warning in
 snb_uncore_imc_init_box()


This patch fixes a compilation problem (unused variable) with the
new SNB/IVB/HSW uncore IMC code.

In V2, we simplify the fix as suggested by Peter Zjilstra.

Reported-by: Stephen Rothwell <sfr@...b.auug.org.au>
Signed-off-by: Stephane Eranian <eranian@...gle.com>
--

diff --git a/arch/x86/kernel/cpu/perf_event_intel_uncore.c b/arch/x86/kernel/cpu/perf_event_intel_uncore.c
index 3e5b240..d614f6b 100644
--- a/arch/x86/kernel/cpu/perf_event_intel_uncore.c
+++ b/arch/x86/kernel/cpu/perf_event_intel_uncore.c
@@ -1722,15 +1722,16 @@ static struct attribute_group snb_uncore_imc_format_group = {
 static void snb_uncore_imc_init_box(struct intel_uncore_box *box)
 {
 	struct pci_dev *pdev = box->pci_dev;
-	u32 addr_lo, addr_hi;
+	int where = SNB_UNCORE_PCI_IMC_BAR_OFFSET;
+	u32 pci_dword;
 	resource_size_t addr;
 
-	pci_read_config_dword(pdev, SNB_UNCORE_PCI_IMC_BAR_OFFSET, &addr_lo);
-	addr = addr_lo;
+	pci_read_config_dword(pdev, where, &pci_dword);
+	addr = pci_dword;
 
 #ifdef CONFIG_PHYS_ADDR_T_64BIT
-	pci_read_config_dword(pdev, SNB_UNCORE_PCI_IMC_BAR_OFFSET+4, &addr_hi);
-	addr = ((resource_size_t)addr_hi << 32) | addr_lo;
+	  pci_read_config_dword(pdev, where + 4, &pci_dword);
+	  addr |= ((resource_size_t)pci_dword << 32);
 #endif
 
 	addr &= ~(PAGE_SIZE - 1);
--
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