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Commit 9d0e6d9d authored by Greg Kurz's avatar Greg Kurz Committed by Michael Ellerman
Browse files

powerpc/vphn: clarify the H_HOME_NODE_ASSOCIATIVITY API 



The number of values returned by the H_HOME_NODE_ASSOCIATIVITY h_call deserves
to be explicitly defined, for a better understanding of the code.

Signed-off-by: default avatarGreg Kurz <gkurz@linux.vnet.ibm.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent 52d99627

arch/powerpc/mm/numa.c

+6 −2
Original line number Diff line number Diff line
@@ -1247,11 +1247,15 @@ static int update_cpu_associativity_changes_mask(void) 
	return cpumask_weight(changes);

}



/* The H_HOME_NODE_ASSOCIATIVITY h_call returns 6 64-bit registers.

 */

#define VPHN_REGISTER_COUNT 6



/*

 * 6 64-bit registers unpacked into 12 32-bit associativity values. To form

 * the complete property we have to add the length in the first cell.

 */

#define VPHN_ASSOC_BUFSIZE (6*sizeof(u64)/sizeof(u32) + 1)

#define VPHN_ASSOC_BUFSIZE (VPHN_REGISTER_COUNT*sizeof(u64)/sizeof(u32) + 1)



/*

 * Convert the associativity domain numbers returned from the hypervisor
@@ -1309,7 +1313,7 @@ static long hcall_vphn(unsigned long cpu, __be32 *associativity) 
	int i;



	rc = plpar_hcall9(H_HOME_NODE_ASSOCIATIVITY, retbuf, flags, hwcpu);

	for (i = 0; i < 6; i++)

	for (i = 0; i < VPHN_REGISTER_COUNT; i++)

		retbuf[i] = cpu_to_be64(retbuf[i]);

	vphn_unpack_associativity(retbuf, associativity);