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Commit 41abc902 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge tag 'metag-for-v3.15-2' of git://git.kernel.org/pub/scm/linux/kernel/git/jhogan/metag 

Pull Metag architecture and related fixes from James Hogan:
 "Mostly fixes for metag and parisc relating to upgrowing stacks.

   - Fix missing compiler barriers in metag memory barriers.
   - Fix BUG_ON on metag when RLIMIT_STACK hard limit is increased
     beyond safe value.
   - Make maximum stack size configurable.  This reduces the default
     user stack size back to 80MB (especially on parisc after their
     removal of _STK_LIM_MAX override).  This only affects metag and
     parisc.
   - Remove metag _STK_LIM_MAX override to match other arches and follow
     parisc, now that it is safe to do so (due to the BUG_ON fix
     mentioned above).
   - Finally now that both metag and parisc _STK_LIM_MAX overrides have
     been removed, it makes sense to remove _STK_LIM_MAX altogether"

* tag 'metag-for-v3.15-2' of git://git.kernel.org/pub/scm/linux/kernel/git/jhogan/metag:
  asm-generic: remove _STK_LIM_MAX
  metag: Remove _STK_LIM_MAX override
  parisc,metag: Do not hardcode maximum userspace stack size
  metag: Reduce maximum stack size to 256MB
  metag: fix memory barriers
parents a7b08063 ffe6902b

arch/metag/include/asm/barrier.h

+3 −0
Original line number Diff line number Diff line
@@ -15,6 +15,7 @@ static inline void wr_fence(void) 
	volatile int *flushptr = (volatile int *) LINSYSEVENT_WR_FENCE;

	barrier();

	*flushptr = 0;

	barrier();

}



#else /* CONFIG_METAG_META21 */
@@ -35,6 +36,7 @@ static inline void wr_fence(void) 
	*flushptr = 0;

	*flushptr = 0;

	*flushptr = 0;

	barrier();

}



#endif /* !CONFIG_METAG_META21 */
@@ -68,6 +70,7 @@ static inline void fence(void) 
	volatile int *flushptr = (volatile int *) LINSYSEVENT_WR_ATOMIC_UNLOCK;

	barrier();

	*flushptr = 0;

	barrier();

}

#define smp_mb()        fence()

#define smp_rmb()       fence()

arch/metag/include/asm/processor.h

+2 −0
Original line number Diff line number Diff line
@@ -22,6 +22,8 @@ 
/* Add an extra page of padding at the top of the stack for the guard page. */

#define STACK_TOP	(TASK_SIZE - PAGE_SIZE)

#define STACK_TOP_MAX	STACK_TOP

/* Maximum virtual space for stack */

#define STACK_SIZE_MAX	(CONFIG_MAX_STACK_SIZE_MB*1024*1024)



/* This decides where the kernel will search for a free chunk of vm

 * space during mmap's.

arch/metag/include/uapi/asm/Kbuild

+1 −1
Original line number Diff line number Diff line
@@ -4,11 +4,11 @@ include include/uapi/asm-generic/Kbuild.asm 
header-y += byteorder.h

header-y += ech.h

header-y += ptrace.h

header-y += resource.h

header-y += sigcontext.h

header-y += siginfo.h

header-y += swab.h

header-y += unistd.h



generic-y += mman.h

generic-y += resource.h

generic-y += setup.h

arch/metag/include/uapi/asm/resource.h

deleted100644 → 0
+0 −7
Original line number Diff line number Diff line 
#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 */

arch/parisc/include/asm/processor.h

+5 −0
Original line number Diff line number Diff line
@@ -55,6 +55,11 @@ 
#define STACK_TOP	TASK_SIZE

#define STACK_TOP_MAX	DEFAULT_TASK_SIZE



/* Allow bigger stacks for 64-bit processes */

#define STACK_SIZE_MAX	(USER_WIDE_MODE					\

			 ? (1 << 30)	/* 1 GB */			\

			 : (CONFIG_MAX_STACK_SIZE_MB*1024*1024))



#endif



#ifndef __ASSEMBLY__