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cpumask: only allocate nr_cpumask_bits.

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

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2015-03-05 10:49:19 +10:30
parent c8ed00107b
commit cdfdef75e7
2 changed files with 2 additions and 10 deletions
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5
include/linux/cpumask.h
View File

@ -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);
}
/*

7
lib/cpumask.c
View File

@ -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;
}