linux-kernel - [PATCH 2/2] PCI: Change the type of 'rom_attr_enabled' in 'struct pci

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Date:   Sun, 18 Jun 2023 18:24:55 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Bjorn Helgaas <bhelgaas@...gle.com>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        linux-pci@...r.kernel.org
Subject: [PATCH 2/2] PCI: Change the type of 'rom_attr_enabled' in 'struct pci_dev'

Make 'rom_attr_enabled' a single bit in a bitfield and move it close to an
existing bitfield so that they can be merged.

This field is only used in 'drivers/pci/pci-sysfs.c' to store 0 or 1.

On x86_64, this shrinks the size of 'struct pci_dev' by 8 bytes.
This goes from 3560 to 3552.

Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
 include/linux/pci.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/pci.h b/include/linux/pci.h
index 106754757279..0ff7500772e6 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -464,12 +464,12 @@ struct pci_dev {
 	unsigned int	no_vf_scan:1;		/* Don't scan for VFs after IOV enablement */
 	unsigned int	no_command_memory:1;	/* No PCI_COMMAND_MEMORY */
 	unsigned int	rom_bar_overlap:1;	/* ROM BAR disable broken */
+	unsigned int	rom_attr_enabled:1;	/* Display of ROM attribute enabled? */
 	pci_dev_flags_t dev_flags;
 	atomic_t	enable_cnt;	/* pci_enable_device has been called */
 
 	u32		saved_config_space[16]; /* Config space saved at suspend time */
 	struct hlist_head saved_cap_space;
-	int		rom_attr_enabled;	/* Display of ROM attribute enabled? */
 	struct bin_attribute *res_attr[DEVICE_COUNT_RESOURCE]; /* sysfs file for resources */
 	struct bin_attribute *res_attr_wc[DEVICE_COUNT_RESOURCE]; /* sysfs file for WC mapping of resources */
 
-- 
2.34.1