* Ingo Molnar <[email protected]> wrote:
> i'm getting this on 32-bit (with the kmap-atomic debugging patch
> applied):
>
> ---------------->
> Calling initcall 0x78b67c00: tipc_init+0x0/0xc0()
> TIPC: Activated (version 1.6.2 compiled Nov 29 2007 15:04:36)
> WARNING: at arch/x86/mm/highmem_32.c:52 kmap_atomic_prot()
> Pid: 1, comm: swapper Not tainted 2.6.24-rc3-cfs-v24 #45
> [<78107272>] show_trace_log_lvl+0x12/0x40
> [<781072ad>] show_trace+0xd/0x20
> [<781086f8>] dump_stack+0x58/0x60
> [<7811541f>] kmap_atomic_prot+0x1bf/0x240
> [<781154ae>] kmap_atomic+0xe/0x20
> [<78157be5>] get_page_from_freelist+0x225/0x420
> [<78157e4d>] __alloc_pages+0x6d/0x3a0
> [<78169a7b>] slob_new_page+0x1b/0x60
> [<78169be4>] slob_alloc+0x124/0x1e0
> [<78169e0f>] __kmalloc_node+0x6f/0xa0
> [<7884f7c2>] reg_init+0x42/0x80
> [<7884f80a>] tipc_reg_start+0xa/0x40
> [<7883e6c6>] tipc_core_start+0x66/0xc0
> [<78b67c81>] tipc_init+0x81/0xc0
this is due to the kzalloc() here:
0x7884f1d0 is in reg_init (net/tipc/user_reg.c:88).
83 spin_lock_bh(®_lock);
84 if (!users) {
85 users = kzalloc(USER_LIST_SIZE, GFP_ATOMIC);
86 if (users) {
87 for (i = 1; i <= MAX_USERID; i++) {
88 users[i].next = i - 1;
which does a:
120 static inline void clear_highpage(struct page *page)
121 {
122 void *kaddr = kmap_atomic(page, KM_USER0);
123 clear_page(kaddr);
124 kunmap_atomic(kaddr, KM_USER0);
125 }
but ... why does the debug code think it's in softirq context?
plus, and this is a slob question i guess, how come we drop into
clear_highpage() for a kzalloc()??
Ingo
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