f3d229c68b
At least on ia64 the (bogus) use of xchg() here results in the compiler warning about an unused expression result. As only an assignment is intended here, convert it to such. Signed-off-by: Jan Beulich <jbeulich@suse.com> Acked-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
55 lines
1,004 B
C
55 lines
1,004 B
C
#define S_SIZE (1024 - (sizeof(unsigned int) + 1))
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struct sbuff {
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unsigned int count;
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char buf[S_SIZE + 1];
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};
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static struct sbuff emergency, *emergency_ptr = &emergency;
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static __printf(2, 3) int sb_add(struct sbuff *m, const char *f, ...)
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{
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va_list args;
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int len;
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if (likely(m->count < S_SIZE)) {
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va_start(args, f);
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len = vsnprintf(m->buf + m->count, S_SIZE - m->count, f, args);
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va_end(args);
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if (likely(m->count + len < S_SIZE)) {
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m->count += len;
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return 0;
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}
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}
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m->count = S_SIZE;
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printk_once(KERN_ERR KBUILD_MODNAME " please increase S_SIZE\n");
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return -1;
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}
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static struct sbuff *sb_open(void)
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{
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struct sbuff *m = kmalloc(sizeof(*m), GFP_ATOMIC);
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if (unlikely(!m)) {
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local_bh_disable();
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do {
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m = xchg(&emergency_ptr, NULL);
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} while (!m);
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}
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m->count = 0;
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return m;
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}
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static void sb_close(struct sbuff *m)
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{
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m->buf[m->count] = 0;
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printk("%s\n", m->buf);
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if (likely(m != &emergency))
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kfree(m);
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else {
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emergency_ptr = m;
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local_bh_enable();
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}
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}
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