Commit 849846c4 authored by Christophe JAILLET's avatar Christophe JAILLET Committed by Bjorn Helgaas
Browse files

PCI: Reorder pci_dev fields to reduce holes 

Group some bitfield variables to reduce holes.  On x86_64, this shrinks the
size of 'struct pci_dev' by 16 bytes (from 3576 to 3560) when compiled with
'allmodconfig'.

Link: https://lore.kernel.org/r/407b17c3e56764ef2c558898d4ff4c6c04b2d757.1687105455.git.christophe.jaillet@wanadoo.fr


Signed-off-by: default avatarChristophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
parent 06c2afb8

include/linux/pci.h

+2 −2
Original line number Diff line number Diff line
@@ -366,8 +366,8 @@ struct pci_dev { 
	pci_power_t	current_state;	/* Current operating state. In ACPI,

					   this is D0-D3, D0 being fully

					   functional, and D3 being off. */

	unsigned int	imm_ready:1;	/* Supports Immediate Readiness */

	u8		pm_cap;		/* PM capability offset */

	unsigned int	imm_ready:1;	/* Supports Immediate Readiness */

	unsigned int	pme_support:5;	/* Bitmask of states from which PME#

					   can be generated */

	unsigned int	pme_poll:1;	/* Poll device's PME status bit */
@@ -392,9 +392,9 @@ struct pci_dev { 


#ifdef CONFIG_PCIEASPM

	struct pcie_link_state	*link_state;	/* ASPM link state */

	u16		l1ss;		/* L1SS Capability pointer */

	unsigned int	ltr_path:1;	/* Latency Tolerance Reporting

					   supported from root to here */

	u16		l1ss;		/* L1SS Capability pointer */

#endif

	unsigned int	pasid_no_tlp:1;		/* PASID works without TLP Prefix */

	unsigned int	eetlp_prefix_path:1;	/* End-to-End TLP Prefix */