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Commit bc41bb11 authored by Bernd Schmidt's avatar Bernd Schmidt Committed by Bryan Wu
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Blackfin arch: fix bug libstdc++ calling writev with an iovec containing {... 


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

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: default avatarBernd Schmidt <bernd.schmidt@analog.com>
Signed-off-by: default avatarBryan Wu <bryan.wu@analog.com>
parent ef4a47db

arch/blackfin/kernel/process.c

+2 −1
Original line number Original line Diff line number Diff line
@@ -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))