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pcnet: avoid structure holes spotted by pahole

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Edited report from pahole on amd64 host:
struct PCNetState_st {
...
	uint16_t                   bcr[32];              /*   340    64 */

	/* XXX 4 bytes hole, try to pack */
...
	int                        tx_busy;              /*  4520     4 */

	/* XXX 4 bytes hole, try to pack */

	qemu_irq                   irq;                  /*  4528     8 */
	void                       (*phys_mem_read)(void *, target_phys_addr_t, uint8_t *, int, int); /*  4536     8 */
	/* --- cacheline 71 boundary (4544 bytes) --- */
	void                       (*phys_mem_write)(void *, target_phys_addr_t, uint8_t *, int, int); /*  4544     8 */
	void *                     dma_opaque;           /*  4552     8 */
	int                        looptest;             /*  4560     4 */

	/* size: 4568, cachelines: 72 */
	/* sum members: 4556, holes: 2, sum holes: 8 */
	/* padding: 4 */
	/* last cacheline: 24 bytes */
};	/* definitions: 2 */

Fix by rearranging the structure to avoid padding.

Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
This commit is contained in:
Blue Swirl 2011-08-07 19:38:49 +00:00
parent 9a975d6356
commit fe87aa83c6
1 changed files with 2 additions and 2 deletions
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4
hw/pcnet.h
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@ -17,17 +17,17 @@ struct PCNetState_st {
uint8_t prom[16];
uint16_t csr[128];
uint16_t bcr[32];
int xmit_pos;
uint64_t timer;
MemoryRegion mmio;
int xmit_pos;
uint8_t buffer[4096];
int tx_busy;
qemu_irq irq;
void (*phys_mem_read)(void *dma_opaque, target_phys_addr_t addr,
uint8_t *buf, int len, int do_bswap);
void (*phys_mem_write)(void *dma_opaque, target_phys_addr_t addr,
uint8_t *buf, int len, int do_bswap);
void *dma_opaque;
int tx_busy;
int looptest;
};