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metag: Remove _STK_LIM_MAX override

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Meta overrode _STK_LIM_MAX (the default RLIMIT_STACK hard limit) to
256MB, apparently in an attempt to prevent setup_arg_pages's
STACK_GROWSUP code from choosing the maximum stack size of 1GB, which is
far too large for Meta's limited virtual address space and hits a BUG_ON
(stack_top is usually 0x3ffff000).

However the commit "metag: Reduce maximum stack size to 256MB" reduces
the absolute stack size limit to a safe value for metag. This allows the
default _STK_LIM_MAX override to be removed, bringing the default
behaviour in line with all other architectures. Parisc in particular
recently removed their override of _STK_LIMT_MAX in commit e0d8898d76
(parisc: remove _STK_LIM_MAX override) since it subtly affects stack
allocation semantics in userland. Meta's uapi/asm/resource.h can now be
removed and switch to using generic-y.

Suggested-by: Helge Deller <deller@gmx.de>
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: linux-metag@vger.kernel.org
Cc: John David Anglin <dave.anglin@bell.net>
This commit is contained in:
James Hogan 2014-05-01 12:31:14 +01:00
parent 042d27acb6
commit c70458f50c
2 changed files with 1 additions and 8 deletions
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2
arch/metag/include/uapi/asm/Kbuild
View File

@ -4,11 +4,11 @@ include include/uapi/asm-generic/Kbuild.asm
header-y += byteorder.h header-y += byteorder.h
header-y += ech.h header-y += ech.h
header-y += ptrace.h header-y += ptrace.h
header-y += resource.h
header-y += sigcontext.h header-y += sigcontext.h
header-y += siginfo.h header-y += siginfo.h
header-y += swab.h header-y += swab.h
header-y += unistd.h header-y += unistd.h
generic-y += mman.h generic-y += mman.h
generic-y += resource.h
generic-y += setup.h generic-y += setup.h

7
arch/metag/include/uapi/asm/resource.h
View File

@ -1,7 +0,0 @@
#ifndef _UAPI_METAG_RESOURCE_H
#define _UAPI_METAG_RESOURCE_H
#define _STK_LIM_MAX (1 << 28)
#include <asm-generic/resource.h>
#endif /* _UAPI_METAG_RESOURCE_H */