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Commit cdfdef75 authored by Rusty Russell's avatar Rusty Russell
Browse files

cpumask: only allocate nr_cpumask_bits. 



Now we'll find out the hard way if anyone has CPUMASK_OFFSTACK and is
returning these or assigning them.

Signed-off-by: default avatarRusty Russell <rusty@rustcorp.com.au>
parent c8ed0010

include/linux/cpumask.h

+2 −3
Original line number Diff line number Diff line
@@ -11,6 +11,7 @@ 
#include <linux/bitmap.h>

#include <linux/bug.h>



/* Don't assign or return these: may not be this big! */

typedef struct cpumask { DECLARE_BITMAP(bits, NR_CPUS); } cpumask_t;



/**
@@ -609,9 +610,7 @@ static inline int cpulist_parse(const char *buf, struct cpumask *dstp) 
 */

static inline size_t cpumask_size(void)

{

	/* FIXME: Once all cpumask assignments are eliminated, this

	 * can be nr_cpumask_bits */

	return BITS_TO_LONGS(NR_CPUS) * sizeof(long);

	return BITS_TO_LONGS(nr_cpumask_bits) * sizeof(long);

}



/*

lib/cpumask.c

+0 −7
Original line number Diff line number Diff line
@@ -89,13 +89,6 @@ bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node) 
		dump_stack();

	}

#endif

	/* FIXME: Bandaid to save us from old primitives which go to NR_CPUS. */

	if (*mask) {

		unsigned char *ptr = (unsigned char *)cpumask_bits(*mask);

		unsigned int tail;

		tail = BITS_TO_LONGS(NR_CPUS - nr_cpumask_bits) * sizeof(long);

		memset(ptr + cpumask_size() - tail, 0, tail);

	}



	return *mask != NULL;

}