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Blackfin arch: fix bug libstdc++ calling writev with an iovec containing { NULL, 0 } fails on Blackfin

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Fix a problem reported in the forums - libstdc++ can call writev with an
iovec containing { NULL, 0 }, which works fine on i686-linux, but fails on
Blackfin.  Fixed by allowing size 0 transfers to/from userspace regardless
of the address.

Signed-off-by: Bernd Schmidt <bernd.schmidt@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>
This commit is contained in:
Bernd Schmidt 2007-10-10 17:54:19 +08:00 committed by Bryan Wu
parent ef4a47db52
commit bc41bb1165
1 changed files with 2 additions and 1 deletions
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arch/blackfin/kernel/process.c
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@ -395,7 +395,8 @@ void finish_atomic_sections (struct pt_regs *regs)
#if defined(CONFIG_ACCESS_CHECK) #if defined(CONFIG_ACCESS_CHECK)
int _access_ok(unsigned long addr, unsigned long size) int _access_ok(unsigned long addr, unsigned long size)
{ {
if (size == 0)
return 1;
if (addr > (addr + size)) if (addr > (addr + size))
return 0; return 0;
if (segment_eq(get_fs(), KERNEL_DS)) if (segment_eq(get_fs(), KERNEL_DS))