PCI: rzg3s-host: Fix compilation warning

[PATCH] PCI: rzg3s-host: Fix compilation warning

Posted by Claudiu 1 week, 2 days ago

From: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>

Fix "bitmap is used uninitialized" compilation warning.

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/all/202512070218.XVMUQCl7-lkp@intel.com
Closes: https://lore.kernel.org/all/202512061812.Xbqmd2Gn-lkp@intel.com
Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
---
 drivers/pci/controller/pcie-rzg3s-host.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pci/controller/pcie-rzg3s-host.c b/drivers/pci/controller/pcie-rzg3s-host.c
index 667e6d629474..83ec66a70823 100644
--- a/drivers/pci/controller/pcie-rzg3s-host.c
+++ b/drivers/pci/controller/pcie-rzg3s-host.c
@@ -479,7 +479,7 @@ static void rzg3s_pcie_intx_irq_handler(struct irq_desc *desc)
 static irqreturn_t rzg3s_pcie_msi_irq(int irq, void *data)
 {
 	u8 regs = RZG3S_PCI_MSI_INT_NR / RZG3S_PCI_MSI_INT_PER_REG;
-	DECLARE_BITMAP(bitmap, RZG3S_PCI_MSI_INT_NR);
+	DECLARE_BITMAP(bitmap, RZG3S_PCI_MSI_INT_NR) = {0};
 	struct rzg3s_pcie_host *host = data;
 	struct rzg3s_pcie_msi *msi = &host->msi;
 	unsigned long bit;
-- 
2.43.0

Re: [PATCH] PCI: rzg3s-host: Fix compilation warning

Posted by Bjorn Helgaas 1 week, 2 days ago

On Tue, Dec 09, 2025 at 02:51:22PM +0200, Claudiu wrote:
> From: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
> 
> Fix "bitmap is used uninitialized" compilation warning.
> 
> Reported-by: kernel test robot <lkp@intel.com>
> Closes: https://lore.kernel.org/all/202512070218.XVMUQCl7-lkp@intel.com
> Closes: https://lore.kernel.org/all/202512061812.Xbqmd2Gn-lkp@intel.com
> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>

Updated commit log as below (the problem is the use of initialized
data, not the warning itself) and applied to pci/for-linus for v6.19,
thanks!

  PCI: rzg3s-host: Initialize MSI status bitmap before use

  Initialize rzg3s_pcie_msi_irq() MSI status bitmap before use.

  Fixes: 7ef502fb35b2 ("PCI: Add Renesas RZ/G3S host controller driver")

> ---
>  drivers/pci/controller/pcie-rzg3s-host.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/pci/controller/pcie-rzg3s-host.c b/drivers/pci/controller/pcie-rzg3s-host.c
> index 667e6d629474..83ec66a70823 100644
> --- a/drivers/pci/controller/pcie-rzg3s-host.c
> +++ b/drivers/pci/controller/pcie-rzg3s-host.c
> @@ -479,7 +479,7 @@ static void rzg3s_pcie_intx_irq_handler(struct irq_desc *desc)
>  static irqreturn_t rzg3s_pcie_msi_irq(int irq, void *data)
>  {
>  	u8 regs = RZG3S_PCI_MSI_INT_NR / RZG3S_PCI_MSI_INT_PER_REG;
> -	DECLARE_BITMAP(bitmap, RZG3S_PCI_MSI_INT_NR);
> +	DECLARE_BITMAP(bitmap, RZG3S_PCI_MSI_INT_NR) = {0};
>  	struct rzg3s_pcie_host *host = data;
>  	struct rzg3s_pcie_msi *msi = &host->msi;
>  	unsigned long bit;
> -- 
> 2.43.0
>